Related
Here it is!
Things we now know for sure.
1. It Does not have BT.
2. It uses SPDIF out of the middle pin.
3. It has a TOSLINK 3.5mm connector for line out/ digital optical audio out.
4. It uses a PULSUS PSM702 chip and a COREDRIVER GC89C510A0 microcontroller
buy it?
now does anybody knows where i can buy the piece in picture number 3??
lionheart7282 said:
now does anybody knows where i can buy the piece in picture number 3??
Click to expand...
Click to collapse
That would make this DIY even better!
http://forum.xda-developers.com/showthread.php?t=1493797
Looks like that chip connected to the pogo dock is a coreriver SC.
http://www.coreriver.com/product-lines/top_CORERIVERmcu.html
I can make out GC89C??? so probably a midas 2.2 or 2.4 programmable microprocessor.
Looks like we will need to follow the lead from here to get a dock working properly.
Hey, Could you send me some higher resolution pictures of the board? I am specifically interested in the small chip near were the pogo pin cable gets attached to the main board. Or the numbers off of it would be good
Also, do you have access to an oscilloscope or logic analyzer? I have been trying to get a dock to play with myself, but it is taking some time
silverchris said:
Hey, Could you send me some higher resolution pictures of the board? I am specifically interested in the small chip near were the pogo pin cable gets attached to the main board. Or the numbers off of it would be good
Also, do you have access to an oscilloscope or logic analyzer? I have been trying to get a dock to play with myself, but it is taking some time
Click to expand...
Click to collapse
I tried reading the all thee numbers off it but it is obscured by what looks like a black marker dot. All I can read is GC89C5, I believe there are at least 3 more numbers/letters.
I do not have access to either an oscilloscope or logic analyzer.
Sent from my Galaxy Nexus using XDA
EDIT: After a closer look and some better lighting we have a GC89C510A0
Sorry, I meant the one near the mark "U9" above VBUS +5V
silverchris said:
Sorry, I meant the one near the mark "U9" above VBUS +5V
Click to expand...
Click to collapse
It reads 0524P, Looks like a ESD chip.
If any of you actually make one of the diy versions you should sell them since i won't buy samsungs way to overpriced
for me, by me and I love you
This has already been done for the EVO 4g using Palm Touchstone capable scraps but I want to take it to another level. Since i'm not much of a programmer I can add to the community in this way.
Please let me know how many of you are interested in this. I'm going to put up full walk throughs as I move along but I will also sell some off (in the marketplace) for those that don't want to go through the hassle. I'm going to start ordering parts and building mock-ups and doing some design work during slow downs at work. I'll have a donation link up eventually if any one wants to help cover the initial costs.
-----------------------------------------------------------------------------
CURRENT DEVELOPMENT STAGE: 1- INDUCTIVE CASE RESEARCH, see #1
PLEASE KEEP AN EYE ON THIS POST (general updates) AND POST#3 (useful links and eventually tutorial)
:good:KEEP DISCUSSION AROUND THE FOLLOWING DESIGN INTENTIONS/ ABOVE DEVELOPMENT STAGE:good:
Design Intents are as follows:
1) A case for housing the inductive coil/wiring
This just requires compatible cases with necessary clearance for the inductive coil and wiring to the male micro usb. Cases with oversized bumpers would be best since they will keep drops from damaging the micro usb plug that will be sticking out of the bottom of the phone. This may not be ideal so if anyone is decent and making plastic molds maybe we could come up with an attachment to a case.
2)NO Hard wiring inside/to the phone
This involves using low profile male mirco USB type B connectors, like this, and mounting and wiring to the case. This will keep your plug always covered and keep you from trying to charge your phone with both inductive and regular usb to the wall/pc. The main design issue here is protecting the male connector to the phone. Suggest usb connectors, wiring, how to boost the amperage, does the palm pre coil protect from over voltage, etc.
3)A car kit.
I will start with my car, A nissan sentra SR, for the car kit. Others are encouraged to come up/share your solutions as well! This should be a hard wired solution using the palm pre/pixi round touchstone dock. Kind of like a dash mount. I think the magnet should hold the phone ok being that my car isn't one of the most powerful things on the planet but for you hot rodders out there keep that possible issue in mind.
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Current Progress: CASEAlright I have the cases in hand! I got three of them in the mail and will be tearing these apart this weekend. The pucks (touchstone bases) should be here sometime next week.
I'm also looking at the following cases
Ballistic
Ballistic 2
Clear S Case
The ballistic I am hoping will give clearance for the micro usb. They will be a bit heavier though... we'll see.
I going to order 2 cases for starters, what should they be?
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**ANY ORIGINAL IDEA/METHOD/MODIFICATION DISCUSSED IN THE THREAD IS THE SOLE INTELLECTUAL PROPERTY OF THE CONTRIBUTOR AND IS NOT OPEN FOR COMMERCIALIZATION WITH OUT THE DIRECT CONSENT OF THE ORIGINAL CONTRIBUTOR- In other words... don't rip off your buddies ideas and give credit where due**
Wrong thread
Useful Links and Resources
Useful Links and Resources
This post will provide you with the knowledge necessary to learn what you need to complete this project. Any helpful links your share in this thread will be copied here.
General Info
What is Electromagnetic Induction? - HERE
A little about wireless power distribution - HERE
Other Mod References
ManiacMagic's E4GT Soldered Inductive Mod - HERE
darrenf's from android central Soldered - HERE
(thanks DaisyPlucksta for the links)
Helpful Videos
qianqinde's how-to for International GS2 (soldered) - HERE thank's rwilco12
Regarding the thread, this would be hardware development which i believe belongs in the general section. As for the idea, it seems like as long as its not too bulky most users wouldn't mind if it extended battery life substantially like 24 hours or more. Could make you rich with over 9.million sgsIII owners. But Im pretty sure there are already many types of chargers on the market so unless i missed something perhaps you should submit this to a patent office so no one steals the idea or design. Just my two cents dinner no one else has posted. But ya not software development so I would move three thread before you get flamed too bad.
No flaming allowed.
Sent from my "I didn't text you last night… Jack Daniels texted you" using xda premium
Maybe in accessories? Good luck. Sound fun. I might be interested once your done.
Sent from my SPH-D710 using Tapatalk 2
abw0046 said:
This has already been done for the EVO 4g using Palm Touchstone capable scraps but I want to take it to another level. Since i'm not much of a programmer I can add to the community in this way.
Design Intents are as follows:
1) A case based solution, the ET4G is too damn thin!
This is just require compatible cases with necessary clearance and materials
that are least obstructive to the magnetic field.
2)NO Hard wiring inside/to the phone
This involves ordering male mirco USB type B connectors and mounting and wiring to the case. This will keep your plug always covered and keep you from trying to charge your phone with both inductive and regular usb to the wall/pc. The only issue here is protecting the male connector to the phone. I've some ideas for this but will be very dependent on the case we use.
3)A car kit.
I will start with my car, A nissan sentra SR, for the car kit. This will be a hard wired solution using the palm pre/pixi round touchstone dock. Kind of like a dash mount. I think the magnet should hold the phone ok being that my car isn't one of the most powerful things on the planet but for you hot rodders I'll keep that possible issue in mind.
Please let me know how many of you are interested in this. I'm going to put up full walk throughs as I move along but I will also sell some off for those that don't want to go through the hassle (is that ok on here? or do i need to set up donations?). Either way let me know because I'm going to start order parts and doing some design work during slow downs at work.
Thoughts? Concerns?
Oh and if you have other devices you would like this type of solution for I'm cool with that. Just ask and we'll work through it!
OH man... here we go!
Click to expand...
Click to collapse
I'm game! I tried doing it myself but I could only find the one spot on the USB plug to hook up to. I opted but to do it because there was some massive dismantling and soldering I would've had to do. I've still got the parts ready for when someone smarter than me figures out an easier way to do it though!
playingbball20 said:
Wrong thread
Click to expand...
Click to collapse
Technically, he is developing something. Just not code.
Sent from my SPH-D710 using XDA
great idea. i have 4 touchstones kicking around. would love to be able to use them.
Technically, this IS "development"
Anyway, I would be interested in this myself. Seems like a great idea. I'm pretty handy & I have a welder/soldering station at my job. Would be happy to help out.
Sent from my SPH-D710 using XDA
I would pay money for this...
Sent from my SPH-D710 using XDA
This sounds very cool. And technically this is development. Just not software related. So I don't see where else this could go.
Sent from my SPH-D710 using XDA
abw0046 said:
This has already been done for the EVO 4g using Palm Touchstone capable scraps but I want to take it to another level. Since i'm not much of a programmer I can add to the community in this way.
.......
Please let me know how many of you are interested in this. I'm going to put up full walk throughs as I move along but I will also sell some off for those that don't want to go through the hassle (is that ok on here? or do i need to set up donations?). Either way let me know because I'm going to start order parts and doing some design work during slow downs at work.
Thoughts? Concerns?
Oh and if you have other devices you would like this type of solution for I'm cool with that. Just ask and we'll work through it!
OH man... here we go!
Click to expand...
Click to collapse
Just a thought.
What would be the charging time using touchstone/conductive charging; or in other words, what would be the output voltage/current provided to the phone. It takes a while on regular chargers to charge the phone compared to HTC phones.
haha I actually did this too my I500. Literally car kit and everything. Even had it play music through Bluetooth. except I hated cases on that phone so I hardwired it. looked so much sexier. But the case is easier. Built like that too just didn't have the car cradle
sent from aokp tablet sgs2
lickarock said:
Technically, he is developing something. Just not code.
Sent from my SPH-D710 using XDA
Click to expand...
Click to collapse
True
How much would this be for a car charger and home charger wireless
Sent from my SPH-D710 using xda premium
I have 2 palm touchstones, 2 old fried pre & pre2, and 2 phone backs for the touchstone charger to integrate with the phone..
I would absolutely love to know how to integrate the "guts" of the battery cover with the needed parts into the e4gt innards to make the wireless charger .. but I'm not sure how yet.. :/ I will keep reading and post here if I get it working..
I assume that the physical connection is totally possible but the OS will most likely need to be able to control voltage and jazz so I'm not sure what would be needed for that part..
sj
Sent from my E4GT on AoKPm5 FF02 OS4.0.4 w/ dpi @ 128 with [email protected] 2.1.1 Pro
Thanks for all the interest and offers for assistance. Being that its my friend's birthday as well as my own on top of fathers day weekend I won't start any design research until Monday.
I have ordered some parts which should be here late next week. I am still trying to find a source for some type B micro USB plugs. Guess I'll shoud stop throwing away those electronic component magazines. I did a quick search and found some but they were $6.50 each with $10 shipping. If any of you have a source for these let me know. Hell you can send me spare cables and I'll deconstruct them if I have to, but that's not very fun.
When I get on my PC I'll add a poll to see where you all would like this topic to be. Then I'll ask you how do I move it
Sent from my SPH-D710 on Rubix using XDA
Lets do it!
I actually got the touchstone and pre back and ripped out the inductive charging circuit just for this (I actually got it for my evo, but I upgraded before I had the chance to follow the evo guide). I'm excited for this!
Anyway - some heads up - the E4GT is MUCH heavier and bigger than the pre. Don't expect it to stay firmly attached. It will stay okay, but you need a really thin back face of the case. You may also try replacing the thin magnets with thicker rare earths. I actually got it under the stock cover okay, and that worked decently, but no good way to attach it. That's where I quit (after thinking about soldering to the board, but not having a good place on the USB connector without taking the phone all of the way apart. I also didn't fins another point on the board to solder to (like the charging circuit), although I'm sure it's there somewhere.
Also, you need to mount the inductive charging circuit a little low because the phone is so long that it will hit the table and not mount properly if you put it in the middle. Furthermore, be ware that if you add a connector to the USB port, this will exacerbate this problem, perhaps to the point of requiring landscape or stronger magnets.
The USB connector you want are available at a number of places. Ebay has some cheap micro usb adapters (including right angle) that you might play with. If you just want the connector itself, it will likely be more expensive, but I suggest checking mouser or digikey.
Good luck! This will be AWESOME!
---------- Post added at 12:59 AM ---------- Previous post was at 12:51 AM ----------
Whoa! Just got curious enough to do a quick google search. You may want to czech these out real quick:
Soldering route: http://forum.xda-developers.com/showthread.php?t=1451684
again: http://forums.androidcentral.com/ep...c-4g-touch-stone-mod-details-lots-photos.html
DaisyPlucksta said:
I actually got the touchstone and pre back and ripped out the inductive charging circuit just for this (I actually got it for my evo, but I upgraded before I had the chance to follow the evo guide). I'm excited for this!
Anyway - some heads up - the E4GT is MUCH heavier and bigger than the pre. Don't expect it to stay firmly attached. It will stay okay, but you need a really thin back face of the case. You may also try replacing the thin magnets with thicker rare earths. I actually got it under the stock cover okay, and that worked decently, but no good way to attach it. That's where I quit (after thinking about soldering to the board, but not having a good place on the USB connector without taking the phone all of the way apart. I also didn't fins another point on the board to solder to (like the charging circuit), although I'm sure it's there somewhere.
Also, you need to mount the inductive charging circuit a little low because the phone is so long that it will hit the table and not mount properly if you put it in the middle. Furthermore, be ware that if you add a connector to the USB port, this will exacerbate this problem, perhaps to the point of requiring landscape or stronger magnets.
The USB connector you want are available at a number of places. Ebay has some cheap micro usb adapters (including right angle) that you might play with. If you just want the connector itself, it will likely be more expensive, but I suggest checking mouser or digikey.
Good luck! This will be AWESOME!
---------- Post added at 12:59 AM ---------- Previous post was at 12:51 AM ----------
Whoa! Just got curious enough to do a quick google search. You may want to czech these out real quick:
Soldering route: http://forum.xda-developers.com/showthread.php?t=1451684
again: http://forums.androidcentral.com/ep...c-4g-touch-stone-mod-details-lots-photos.html
Click to expand...
Click to collapse
Awesome find DP! Looks extremely promising! I will see if I can get it working as soon as I have the time.. hopefully sometime this week
sj
Sent from my E4GT on AoKPm5 FF02 OS4.0.4 w/ dpi @ 128 with [email protected] 2.1.1 Pro
Back in the days when I was more adventurous with my Infuse 4g, I put together a little project board that allows me to specify resistances between pins 4 and 5 of a Micro-B USB cable. This allowed me to force my phone into Car Dock mode, or act as a USB JIG (for Triangle-Away purposes), or even connect to the phone using UART. I have a TTL 3.3v level conversion on the other end (a nice little FTDI breakout board that provides a USB serial port), and that makes it simple to capture the output of UART while the phone boots. I’ve used this board on my Infuse, my Galaxy S2, and now my new Galaxy S4.
To get it to work this time, I had to connect the RxD, TxD, VCC and GND wires up like usual to the FTDI breakout board, but I had to attach the 619k resistance at a specific timing. Here’s the order:
Unplug battery
Attach MicroB cable to phone
Attach the 4 wires above (easy for me, with dip switches for each)
Attach battery
Start Putty
Attach 619k resistance between 4th/5th pins.
Watch the magic
Attached is the UART output from this. Many thanks to AdamOutler and his help with the previous generations of Samsung devices. Hope this somehow helps in the efforts to obtain root. Let me know if there's anything special you'd like me to try.
Just tried my jig on the S4, and it works to put the phone in download mode.
Sent from my GT-I9300 using xda premium
I've been trying various resistances, and I can't seem to get to an SBL prompt. I'm wondering if this is because the bootloader is locked? If anyone has different results, please let us know how you did it. (thanks)
Any way I could get someone with some wiring experience to check out what we've got going on with the Samsung Infuse car dock on this thread? Trying to figure out why the Infuse car dock worked on the Skyrocket and SIII for me personally, but not the S4 - won't put it in car dock mode and won't charge the device.... if someone knew where the wires were supposed to be run, I have a spare base with a plug on it that's not attached to the mount that I can hack up, provided this isn't something too intense for me to get involved in! I can do a good bit of customizing when it comes to cars and car electronics, but I don't have all the cool tools it sounds like some of you have!
Thanks in advance for any insight you can bring to this discussion!
KryptosXLayer2 said:
Any way I could get someone with some wiring experience to check out what we've got going on with the Samsung Infuse car dock on this thread? Trying to figure out why the Infuse car dock worked on the Skyrocket and SIII for me personally, but not the S4 - won't put it in car dock mode and won't charge the device.... if someone knew where the wires were supposed to be run, I have a spare base with a plug on it that's not attached to the mount that I can hack up, provided this isn't something too intense for me to get involved in! I can do a good bit of customizing when it comes to cars and car electronics, but I don't have all the cool tools it sounds like some of you have!
Thanks in advance for any insight you can bring to this discussion!
Click to expand...
Click to collapse
I set my jig-board to 619k exactly and provided it with vcc5v and a ground, and it does not charge and does not give car dock mode at all. For older Samsung devices, I always referenced:
http://forum.xda-developers.com/showthread.php?t=820275
However, it seems the hardware might have changed? The older handsets have the fsa9480 ... perhaps one of our hardware-oriented devs could tell us what the S4 has inside? Might point us in the right direction to get the same list of modes/resistances ...
Aou said:
I set my jig-board to 619k exactly and provided it with vcc5v and a ground, and it does not charge and does not give car dock mode at all. For older Samsung devices, I always referenced:
http://forum.xda-developers.com/showthread.php?t=820275
However, it seems the hardware might have changed? The older handsets have the fsa9480 ... perhaps one of our hardware-oriented devs could tell us what the S4 has inside? Might point us in the right direction to get the same list of modes/resistances ...
Click to expand...
Click to collapse
Well damn, I'm not the only one scratching their heads at this then, that's kind of good news! Thank you for testing, and you're right, I think once we have a little more answers, we'll be on to something here for sure!
Sent from my Samsung Galaxy S 4 using the XDA app
Aou said:
I set my jig-board to 619k exactly and provided it with vcc5v and a ground, and it does not charge and does not give car dock mode at all. For older Samsung devices, I always referenced:
http://forum.xda-developers.com/showthread.php?t=820275
However, it seems the hardware might have changed? The older handsets have the fsa9480 ... perhaps one of our hardware-oriented devs could tell us what the S4 has inside? Might point us in the right direction to get the same list of modes/resistances ...
Click to expand...
Click to collapse
http://www.ifixit.com/Teardown/Samsung+Galaxy+S4+Teardown/13947/1
Starting at step 14 they get into a detailed look at the hardware on board. Maybe this can help answer some questions for you.
Sent from my SGH-I747 using Tapatalk 2
highaltitude said:
Just tried my jig on the S4, and it works to put the phone in download mode.
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
I, too still have jig from GS2 day. it works with GS4 :laugh:
Here's what one of the guys from iBolt has to say about the dock, collected from two threads regarding the Infuse dock:
MikaelPe said:
The Infuse Dock can't be used with the Galaxy S4 no matter what. This has to do with the fact that Samsung has changed the pin-out configuration when moving to the "new platform" so there's no technical way (to the best of our knowledge) to get it to charge or to start the car-mode. Not sure if this helps?
Click to expand...
Click to collapse
MikaelPe said:
Kryptos, as you probably saw in my reply on the other thread I unfortunately think the Infuse Dock is dead. Samsung have changed both the firmware and the pin-out so it neither charges nor is the traditional car-mode present anymore. As Samsung is not building their own OEM car dock it was probably not on the "checklist" so they simply skipped integrating the functionality. We've obviously figured out a solution and we are hard at work bringing a bunch of developers with us so they make their apps compatible with our Dock. We all can benefit from not only "DockMode" (as we simply call it henceforth) and the nice "aux-out" through microUSB, that is in my opinion a much bigger deal then anything they presented as "new feature" when introducing the S4. Hope this answers helps?
Click to expand...
Click to collapse
So I ended up ordered the iBolt xProDock from Amazon, don't worry about replying to the PM I send you Aou since we really don't have any testing to do on the iBolt or modifying to do on the Infuse dock - it is dead and I don't think I'm prepared to even try and revive it!
Sorry to "necro" but I need more info on this. If you connect the 619K resistor before power-on won't it work? What are the settings for baudrate, error checking etc.??
I'm designing a dock for the N7v2 for use in a car. It will have Qi wireless charging and Bluetooth audio receiver, with a standard 3.5mm audio output. It should be compatible with most cases.
I am also currently designing a mounting method that should be close to universal between different cars, and should not fall off like most other docks in the market.
I designed one for the N7v1 using the Pogo pins, and I can never go back to not having a dock for my tablet in my car. It's amazing the difference it made for me.
I want to know a couple things.Please reply with the following template:
1. Would you want a dock like this?
2. How much do you expect to pay for it?
Thank you everyone, in advance!
lorddralnu said:
I'm designing a dock for the N7v2 for use in a car. It will have Qi wireless charging and Bluetooth audio receiver. It should be compatible with most cases.
I am also currently designing a mounting method that should be close to universal between different cars, and should not fall off like most other docks in the market.
I designed one for the N7v1 using the Pogo pins, and I can never go back to not having a dock for my tablet in my car. It's amazing the difference it made for me.
I want to know a couple things.Please reply with the following template:
1. Would you want a dock like this?
2. How much do you expect to pay for it?
Thank you everyone, in advance!
Click to expand...
Click to collapse
Sounds like a great idea. Do you have any links showing your work with N7v1? Heck, I may be interested in that version since the v1 tablet can be had for cheap these days and is more than capable for the limited functions needed in a car. At any rate:
1. yes, would be interested
2. no idea what a fair price would be, but $50-$100 seems like a fair ballpark
I would think very carefully why you need a wireless charger in a car.
Heat kills batteries; tablets in cars get hot. Why add heat to your woes?
The tablet is likely to be busy playing music and navigating, often in full sunlight. Why add to the heating problems by using a wireless charger when a 5v cord charger attached to the car supply will do the trick?
The wireless car mount/charger iterations for the Nexus 4 were a failure, I recall.
rant said:
Sounds like a great idea. Do you have any links showing your work with N7v1? Heck, I may be interested in that version since the v1 tablet can be had for cheap these days and is more than capable for the limited functions needed in a car. At any rate:
1. yes, would be interested
2. no idea what a fair price would be, but $50-$100 seems like a fair ballpark
Click to expand...
Click to collapse
I've attached 4 pictures of the dock I made for the first Nexus 7. You'll notice that it inst exactly a dock you can put in just any car. I realized I made a little too rugged... and big!
croques said:
I would think very carefully why you need a wireless charger in a car.
Heat kills batteries; tablets in cars get hot. Why add heat to your woes?
The tablet is likely to be busy playing music and navigating, often in full sunlight. Why add to the heating problems by using a wireless charger when a 5v cord charger attached to the car supply will do the trick?
The wireless car mount/charger iterations for the Nexus 4 were a failure, I recall.
Click to expand...
Click to collapse
Well, that's why I don't leave the tablet in the car, I keep it with me. While I'm in the car, if it's hot out I will have the A/C on anyways, so heat has not been an issue.
Most of my broken devices are dead because the USB port broke because of wear and tear. One of the points of this dock is to reduce that. Plugging in a device everytime I get in the car is partly to blame for such failures. I would have used Pogo Pins, like with the first Nexus 7, but they don't exist on the second.
Shared app developing ideas
Hey everyone,
my name is joseph and i am new to this website. I am also new to the whole rooting phones as well as i am learning the basics of computer science-- os, rom, ram, eprom, android, custom roms.....etc.
I honestly have no idea what i am looking to read and study up on so if you have any ideas than please let me know so i can educate myself. I end goal is to be a program developer.
Also i have an amazing ideas of a great new app. I have the layouts for the app but don't have the knowledge to build the app myself. If you are interested in learning more about my idea and possibly collaberate pleae let me know and we can possibly exchange numbers.
Another thing, i am an inventor and creator.
-----trickyspartan
lorddralnu said:
Most of my broken devices are dead because the USB port broke because of wear and tear. One of the points of this dock is to reduce that.
Click to expand...
Click to collapse
Look at active Brodit car mounts - say for a Nexus 4. There the device is supported and aligned as it glides onto or off the USB. There is no possibility of twisting or yawing.
I think your proposal maybe over-kill - simplest solutions are always best IMHO. A guy in the Nexus 4 forum came to no good end and had a lot of unhappy 'subscribers'. Just saying.
croques said:
Look at active Brodit car mounts - say for a Nexus 4. There the device is supported and aligned as it glides onto or off the USB. There is no possibility of twisting or yawing.
I think your proposal maybe over-kill - simplest solutions are always best IMHO. A guy in the Nexus 4 forum came to no good end and had a lot of unhappy 'subscribers'. Just saying.
Click to expand...
Click to collapse
I would normally agree. I was hoping to make one that doesnt require a case to be removed to use. I designed my previous dock the way you describe (except it used the Pogo pins on the side), but I always had to remove the case and eventually the first case was showing signs of damage from being removed so often.
My hope is that the base platform of the dock I want to build will be compatible with multiple models of smartphones and tablets that are Qi capable. That'll require a lot more planning, but may be worth it.
lorddralnu said:
.
My hope is that the base platform of the dock I want to build will be compatible with multiple models of smartphones and tablets that are Qi capable. That'll require a lot more planning, but may be worth it.
Click to expand...
Click to collapse
Well if you're set on the route you've described; ... I see you've picked up on the Peltier pump in another thread. Credit me somewhere if you make it!
But I might consider an approach made by Philips in an Android Bluetooth Speaker and dock. The adjustment for USB and its placement on an edge, plus 180 degree rotation needed for some models, was catered for physically. A much cheaper approach which copes with tablets and phones!
croques said:
Well if you're set on the route you've described; ... I see you've picked up on the Peltier pump in another thread. Credit me somewhere if you make it!
Click to expand...
Click to collapse
I think I will use a Peltier pump. And yes, I'll make sure you get credit for that idea I'll mount the transmitting coil onto the cold side (probably with a layer of copper in between, we'll try several things) and have the hot side of the pump mounted to the aluminum/sheet metal of the back plate (probably with thermal paste as well). I'll have the pump on a simple thermostat. Good thing I have an EE helping me with this project
Hopefully the final product won't need a Peltier pump, but I will definitely have it in the prototype.
croques said:
But I might consider an approach made by Philips in an Android Bluetooth Speaker and dock. The adjustment for USB and its placement on an edge, plus 180 degree rotation needed for some models, was catered for physically. A much cheaper approach which copes with tablets and phones!
Click to expand...
Click to collapse
I haven't had very good experiences with using that type of dock The results of daily use tend to be USB ports that are stretched and loose. At least that's how it has been in my experience.
lorddralnu said:
I'll mount the transmitting coil onto the cold side (probably with a layer of copper in between, we'll try several things) and have the hot side of the pump mounted to the aluminum/sheet metal of the back plate (probably with thermal paste as well). I'll have the pump on a simple thermostat. Good thing I have an EE helping me with this project
Click to expand...
Click to collapse
Don't forget to talk to your EE about eddy current loses in any conductors (copper, aluminium) you have nearby to your induction coil.
Interesting read, but with the cooler this is going to be a very expensive dock. Without it, look to Canada for your market.
I rigged up one for my Nexus 4 last Winter. Based on some testing, I used the most efficient charger I could find for that phone (the LG wcp-700). It worked very well... until late spring when the mercury broke 70. To make a long story short, I pulled it last month as the phone was getting too hot. This in a suv with a 4 liter v6 with plenty of air conditioning, front and rear.
Without the cooler, the tablet needs to be located directly in front of a vent, or even in moderate climates the unit will get hot enough to significantly reduce charging current.
One more thing to consider... the Nexus 7 is polarized vertically. This means that it is invisible in landscape orientation for anyone wearing polarized driving glasses, which I am willing to bet is a large percentage of your prospective market (tech savvy, auto enthusiasts). Most displays designed for vehicles are polarized at 45°, making this not such an issue.
While the tinkerer, software developer, and electronic geek in me wanted a fully integrated tablet in my truck, I soon came to the conclusion that it was simply not practical. What is really needed is a properly done appRadio, where a head unit can mirror the display of a mobile device (ideally wirelessly - miracast, etc.) with a control link set up to pass touches on the head unit back to the mobile device. We're about 30% there now, but a lack of standards, and major players wanting proprietary solutions is a problem.
I wish you much success with your endeavor, but just wanted to share my experience and feelings that this will not be all that marketable a product.
The problems you had with the nexus 4 does not necessarily effect the nexus 7. The nexus 4 was pretty terrible at wireless charging. I had a car setup with a qi charger with the lumia 920 and it worked great even in hot weather. I am not saying the nexus 7 will work, but it might.
Sent from my HTC One using xda app-developers app
txaggies07 said:
The nexus 4 was pretty terrible at wireless charging.
Click to expand...
Click to collapse
What makes you say that? I ask as I have seen relatively similar performance with both the N7 and N4. The tricky thing about the N4 is that the coil is not centered in the vertical dimension, so for folks making the assumption that it is, there will be quite a bit of offset.
Solutions Etcetera said:
What makes you say that? I ask as I have seen relatively similar performance with both the N7 and N4. The tricky thing about the N4 is that the coil is not centered in the vertical dimension, so for folks making the assumption that it is, there will be quite a bit of offset.
Click to expand...
Click to collapse
I say that because of all the issues people had with car docks. It also had issues with the dt-900 qi chargers when it shouldn't have. It heated up excessively with most chargers.
I wonder if there will be an Official dock that lets you:
1. Charge
2. Expand TV HDMI out
3. USB port for Hard drive access
I really want the Nexus & FHD to be a Home entertainment player...may be a remote/ Or Kinect like gesture control app built in with the dock
Hope this comes true...it will be the best Combo for a home unit!
I would like to buy a nexus 7 to hack it into my wifes car permanently. I am worried about the stock battery in the extreme temp changes. Is there a way I could remove the battery and just have the car battery be it's battery? I can't imagine it draining the battery too much over a day or so.
stupid idea i must say...........
leaving all voltage/current/temperature issues aside, if u somehow do make it work, ur tab's gonna turn off every time when u switch off the ignition (at traffic lights, jams etc).
why not just buy a dashboard dock for ur tab, and a car charger(which is connected via the cigarette lighter outlet), u can leave tht charger connected if u wish.
aritro88 said:
stupid idea i must say...........
leaving all voltage/current/temperature issues aside, if u somehow do make it work, ur tab's gonna turn off every time when u switch off the ignition (at traffic lights, jams etc).
why not just buy a dashboard dock for ur tab, and a car charger(which is connected via the cigarette lighter outlet), u can leave tht charger connected if u wish.
Click to expand...
Click to collapse
Clearly you have no idea what you are talking about, so please refrain from shedding your "brilliance" moving forward. This is nothing new, and people are doing this all over the place.
There are applications to allow the tablet to remain charged while in ignition->off mode, while not draining the vehicle's power (read: trickle charging, essentially). Who the hell turns off their car at traffic lights/jams? I don't know a single person that does this.
There are TONS of advantages to installing a N7 into your vehicle as your primary audio/nav/etc. source. Internet radio, hands free call/SMS over stereo, navigation, etc. all in one for a mere couple hundred dollars.
Do some research before you just slam someone's idea.
OP: Check out an app called Tasker. It allows you to configure the tablet to see vehicle ignition and at that condition, brighten the screen, turn on WiFi/Bluetooth/GPS/etc., and then turn all that stuff off, and go into a low voltage mode. This will take care of your battery concerns.
tasker
Yes I know about tasker and I am sure I can get that to work for ignition on and off. Maybe I need to rephrase my question and shed some more light.What I am wondering is if there is a good way to run it with no battery and use the car completely for power or if it is even possible. I know that tasker will get its info from it if there is power on the charge port but what if I don't use that? What if I give it power directly from the car where the battery should be. Is it possible for me to do that? The only reason I was thinking of doing that is because it would be permanent and I do not want the battery to explode in the summer heat. Could I run the tab with just power over USB and no battery? So that ignition sends power to the Tab and it has no tablet battery ? I have not purchased the tablet yet and was hoping to figure this all out before I start hacking it to pieces. I am not scared to solder or do any of that but I do not know how the tablet will work with no battery so I was hoping someone else would. Thanks
aritro88 said:
stupid idea i must say...........
leaving all voltage/current/temperature issues aside, if u somehow do make it work, ur tab's gonna turn off every time when u switch off the ignition (at traffic lights, jams etc).
why not just buy a dashboard dock for ur tab, and a car charger(which is connected via the cigarette lighter outlet), u can leave tht charger connected if u wish.
Click to expand...
Click to collapse
I do not shut off my car as I do not live in a big city with traffic jams or any of that. I am not worried about voltage/current as I am sure I can figure that out or modify a current 12v to usb charger. Temperature I am also not worried about as I can add heatsinks to everything and fans if needed. I am a little worried about the battery sitting in the car in the heat and that is why I am asking these questions.
StopHammertime said:
Who the hell turns off their car at traffic lights/jams? I don't know a single person that does this.
Click to expand...
Click to collapse
either u (and the people you know) r very rich, or u hav got a SUPER eco friendly fuel saving car that i dont know about. everyone turns off their ignition when they are stuck at jams n lights.
my guess, u own a normal run off the mill car. so switch off ur engine when required, it'll save u abt 800-1000$ worth of fuel in a year
There are TONS of advantages to installing a N7 into your vehicle as your primary audio/nav/etc. source. Internet radio, hands free call/SMS over stereo, navigation, etc. all in one for a mere couple hundred dollars.
Click to expand...
Click to collapse
not to mention the laborious process of rewiring ur car's electrical systems, dashboard trims etc...........
my process will cost a maximum of abt 10-15$, and at max 2mins of install time. (use a "line-in" cable to route ur tab's audio via the cars existing stereo system)
JohnnyTightlips said:
What I am wondering is if there is a good way to run it with no battery and use the car completely for power or if it is even possible.
Click to expand...
Click to collapse
try it with ur cell phone. connect and charger and pull out the battery, see what happens....
JohnnyTightlips said:
I am a little worried about the battery sitting in the car in the heat and that is why I am asking these questions.
Click to expand...
Click to collapse
??? Heat on the battery will do what ??? I have had a GPS on the dash of my car solid, parked outdoors, for 2 years. Still works fine when plugged in to the 12v adapter, and even holds a charge. Heat may shorten "life" of battery, but if it is also connected to a power cource of the car, should be FINE.:good:
Well from the looks of it no one has a real answer so I am just going to mess around with one when I get it and see what works best for me. I do not mind rewiring the entire car as I planned to do that with new speakers and an amp etc. I have done many car audio installs and I actually enjoy doing it. I think what I will probably end up doing is keeping the battery in it and if it does go bad I can just replace it. The way I see it is it is a pretty cheap tablet to mess around with compared to the thousand plus I would spend on a double din to do the same thing. Plus if I don't like how it works on my test bench then I will just use it as a tablet and not put it in the car. Thanks for the help. Also I don't know a single person who shuts their cars off at stop lights. I am sure it is great on the car to start and stop the motor every 2 minutes. You do realize you use very little gas when at idle. Anyways, thanks for the ideas.
Is this a serious post? Obviously if I am looking to hack a 200$ tablet I am not worried about cost too much. Also your idea is easy but I want it to be integrated and clean. I want it to look nice and not just have wires and mount sitting there.
aritro88 said:
either u (and the people you know) r very rich, or u hav got a SUPER eco friendly fuel saving car that i dont know about. everyone turns off their ignition when they are stuck at jams n lights.
my guess, u own a normal run off the mill car. so switch off ur engine when required, it'll save u abt 800-1000$ worth of fuel in a year
not to mention the laborious process of rewiring ur car's electrical systems, dashboard trims etc...........
my process will cost a maximum of abt 10-15$, and at max 2mins of install time. (use a "line-in" cable to route ur tab's audio via the cars existing stereo system)
try it with ur cell phone. connect and charger and pull out the battery, see what happens....
Click to expand...
Click to collapse
aritro88 said:
either u (and the people you know) r very rich, or u hav got a SUPER eco friendly fuel saving car that i dont know about. everyone turns off their ignition when they are stuck at jams n lights.
my guess, u own a normal run off the mill car. so switch off ur engine when required, it'll save u abt 800-1000$ worth of fuel in a year
not to mention the laborious process of rewiring ur car's electrical systems, dashboard trims etc...........
my process will cost a maximum of abt 10-15$, and at max 2mins of install time. (use a "line-in" cable to route ur tab's audio via the cars existing stereo system)
try it with ur cell phone. connect and charger and pull out the battery, see what happens....
Click to expand...
Click to collapse
Is this real life? are you serious right now? You have got to either be trolling, or just a complete idiot.
You should have to pass at least a 4rd grade grammar test to post on this forum, because posts like these are just embarrassing to the forum.
aritro88 said:
either u (and the people you know) r very rich, or u hav got a SUPER eco friendly fuel saving car that i dont know about. everyone turns off their ignition when they are stuck at jams n lights.
my guess, u own a normal run off the mill car. so switch off ur engine when required, it'll save u abt 800-1000$ worth of fuel in a year
Click to expand...
Click to collapse
2001 Corvette, I'm not rich, I'm a DIY'er. Isn't that what this forum is for? People that like to do projects and things themselves? Are you not from the US? Literally, no one does that but you. It doesn't take much fuel for a vehicle to sit at idle. In fact, it generally consumes MORE fuel to start a vehicle rather than let it idle for a few minutes rather than turn it off, wait a minute, turn it on, drive a bit, repeat, etc. Care to argue with me about this? I'm an ASE certified technician and will teach you a thing or two.
aritro88 said:
not to mention the laborious process of rewiring ur car's electrical systems, dashboard trims etc...........
my process will cost a maximum of abt 10-15$, and at max 2mins of install time. (use a "line-in" cable to route ur tab's audio via the cars existing stereo system)
Click to expand...
Click to collapse
Rewiring my car? Haha. No. There's no rewiring involved other than adding an adapter. I think even a 4 year old could handle that task. Dashboard trims should not need modification on most newer vehicles, as most newer vehicles come with a double din or larger console that will either allow for direct fitment, or fitment with a simple install kit. My car requires modification, but it's easy work. It's not for the average Joe when it comes to modifying plastics, no, but you can hire people to do that. Also, again, this is a PROJECT. If you don't like it, shut up about it and don't post. The OP wants to do this, let him do it. Congrats on your cool 2 minute idea, but guess what, it's going to look stupid compared to an in-dash installation. Don't believe me?
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versus
---------- Post added at 10:31 AM ---------- Previous post was at 10:25 AM ----------
e30andrew said:
Is this real life? are you serious right now? You have got to either be trolling, or just a complete idiot.
You should have to pass at least a 4rd grade grammar test to post on this forum, because posts like these are just embarrassing to the forum.
Click to expand...
Click to collapse
:good:
lol'd @ 4rd grade
Awesome post.. I see you went the whole nexus dash route, did you end up going with a permanent solution or is the tablet just hiding in there? I wanted to do this for my wife and make it as friendly as possible. I was looking at using the ElementalX kernel so that I could add usb storage while charging, is that what you did? I would also be using co-pilot for gps since I can just download the maps. Did you add a usb-dac to yours? I figured if I am going to spend some money on nice speakers and an amp or two I might as well get the best audio quality. My biggest concern is that this project will be wife proof and it will work well for her on a daily use. I would love to get her steering controls working too but that may be a stretch. I actually love to tinker with this stuff so if it takes a couple weeks to get it working with ignition on off etc and music, gps, etc etc I am totally cool with that. I have done 4 carputer intalls before this but this will be my first tablet job. I figure if it goes well and I really like it then I will do the same to my car.
StopHammertime said:
2001 Corvette, I'm not rich, I'm a DIY'er. Isn't that what this forum is for? People that like to do projects and things themselves? Are you not from the US? Literally, no one does that but you. It doesn't take much fuel for a vehicle to sit at idle. In fact, it generally consumes MORE fuel to start a vehicle rather than let it idle for a few minutes rather than turn it off, wait a minute, turn it on, drive a bit, repeat, etc. Care to argue with me about this? I'm an ASE certified technician and will teach you a thing or two.
Rewiring my car? Haha. No. There's no rewiring involved other than adding an adapter. I think even a 4 year old could handle that task. Dashboard trims should not need modification on most newer vehicles, as most newer vehicles come with a double din or larger console that will either allow for direct fitment, or fitment with a simple install kit. My car requires modification, but it's easy work. It's not for the average Joe when it comes to modifying plastics, no, but you can hire people to do that. Also, again, this is a PROJECT. If you don't like it, shut up about it and don't post. The OP wants to do this, let him do it. Congrats on your cool 2 minute idea, but guess what, it's going to look stupid compared to an in-dash installation. Don't believe me?
versus
---------- Post added at 10:31 AM ---------- Previous post was at 10:25 AM ----------
:good:
lol'd @ 4rd grade
Click to expand...
Click to collapse
JohnnyTightlips said:
Awesome post.. I see you went the whole nexus dash route, did you end up going with a permanent solution or is the tablet just hiding in there? I wanted to do this for my wife and make it as friendly as possible. I was looking at using the ElementalX kernel so that I could add usb storage while charging, is that what you did? I would also be using co-pilot for gps since I can just download the maps. Did you add a usb-dac to yours? I figured if I am going to spend some money on nice speakers and an amp or two I might as well get the best audio quality. My biggest concern is that this project will be wife proof and it will work well for her on a daily use. I would love to get her steering controls working too but that may be a stretch. I actually love to tinker with this stuff so if it takes a couple weeks to get it working with ignition on off etc and music, gps, etc etc I am totally cool with that. I have done 4 carputer intalls before this but this will be my first tablet job. I figure if it goes well and I really like it then I will do the same to my car.
Click to expand...
Click to collapse
Actually, that's the build I'm basing mine off of. Mine is going to be very similar, though I did have to do a bit of dash modification to make it fit (I should be done this week and will be posting pics/build thread). The one in the photo is "permanent" (though he simply hot glued brackets to it and it could easily be removed), and mine will be permanent. For $200, I have no issue keeping the thing installed permanently. My current 2013 has CM11 on it, but I haven't tested it with USB OTG (waiting on another cable to arrive), though if it doesn't work, I'll just use the ElementalX kernel with a stock ROM, since I'm sure that will work. Timur is working on a 2013 ROM as well. However, that's exactly what the plan is. 1TB external HDD with the accessory wire switching on a relay to engage the charging/screen on profile for the tablet, then upon key off, kill relay, and switching profile to off profile. I'm using a ByByte QUAD 7850 mini-amp to power everything. (LINK)
Regarding steering wheel controls, though I hear it's possible, I'm told it is a MAJOR project. I'm not going to bother with that, myself.
Sounds awesome, I will be excited to read your write up. I am curious to know how good that little amp will be. I was thinking of doing a 5 channel amp but I really didn't want to tear up the interior to run all the wires. Will you be using stock speakers? Are you using the 3.5mm jack or going to move toward a usb-dac? I will probably just go with a 64gb usb pen drive since my wife will only be doing music and very few movies if ever. I will also be adding fm to mine. Seems like all of this can be easily tested before it is in a car so I might have to take the plunge and start tinkering. Hook me up with a link when you get your write up going. Thanks
StopHammertime said:
Actually, that's the build I'm basing mine off of. Mine is going to be very similar, though I did have to do a bit of dash modification to make it fit (I should be done this week and will be posting pics/build thread). The one in the photo is "permanent" (though he simply hot glued brackets to it and it could easily be removed), and mine will be permanent. For $200, I have no issue keeping the thing installed permanently. My current 2013 has CM11 on it, but I haven't tested it with USB OTG (waiting on another cable to arrive), though if it doesn't work, I'll just use the ElementalX kernel with a stock ROM, since I'm sure that will work. Timur is working on a 2013 ROM as well. However, that's exactly what the plan is. 1TB external HDD with the accessory wire switching on a relay to engage the charging/screen on profile for the tablet, then upon key off, *****. I'm using a ByByte QUAD 7850 mini-amp to power everything. (LINK)
Regarding steering wheel controls, though I hear it's possible, I'm told it is a MAJOR project. I'm not going to bother with that, myself.
Click to expand...
Click to collapse
JohnnyTightlips said:
Sounds awesome, I will be excited to read your write up. I am curious to know how good that little amp will be. I was thinking of doing a 5 channel amp but I really didn't want to tear up the interior to run all the wires. Will you be using stock speakers? Are you using the 3.5mm jack or going to move toward a usb-dac? I will probably just go with a 64gb usb pen drive since my wife will only be doing music and very few movies if ever. I will also be adding fm to mine. Seems like all of this can be easily tested before it is in a car so I might have to take the plunge and start tinkering. Hook me up with a link when you get your write up going. Thanks
Click to expand...
Click to collapse
The guy who's build I'm replicating used the mini amp, said it was just fine. It's basically the same as the built-in amps on a regular head unit. I may switch to aftermarket speakers/amp/sub in the future, though, so stock speakers for now. Since it has a factory Bose setup, I had to buy a PAC ROEM-VET1 adapter to lower the frequency, which allows me to use the factory speakers.
Yup, definitely can mostly be bench tested first. I haven't done much research on FM. Have you? Any thoughts on how to accomplish that? I really don't care if I never have FM in my car again, but I'm curious to know how people are accomplishing that.
Will do on the link. :good:
StopHammertime said:
The guy who's build I'm replicating used the mini amp, said it was just fine. It's basically the same as the built-in amps on a regular head unit. I may switch to aftermarket speakers/amp/sub in the future, though, so stock speakers for now. Since it has a factory Bose setup, I had to buy a PAC ROEM-VET1 adapter to lower the frequency, which allows me to use the factory speakers.
Yup, definitely can mostly be bench tested first. I haven't done much research on FM. Have you? Any thoughts on how to accomplish that? I really don't care if I never have FM in my car again, but I'm curious to know how people are accomplishing that.
Will do on the link. :good:
Click to expand...
Click to collapse
I looked into it and people have used something like this DVB-T Realtek RTL2832U Elonics R820T 50MHz-2200MHz HD TV DAB SDR RTL-SDR Project and used it for radio with SDR TOUCH I ordered one already and will see how well it works on a PC before I get the tablet. You would need to get a usb hub working in order to plug it in and your hdd. I learned a lot from Nexus 7 clean car install with backup cam. He is using the older nexus but I am sure a lot of the same stuff applies as long as you have a kernel that supports it which there is now. My wife could not live without NPR so she has to have radio. It is also nice to have radio and not need data, then you know if there are any weather events or crazy things going on.
aritro88 said:
stupid idea i must say...........
.
Click to expand...
Click to collapse
Search YouTube. Some really cool in dash tablet setups out there. They even have modules avail now where you can use your steering wheel controls with the tablet. For a 200$ tablet, N7 not a bad deal for an in dash car setup. There is a great market out there for supplies and Installers on this exact topic!! Some make them removable, some pop into sight when you turn the key.!! I would love to have the time to take on an in dash Android setup, fun project to say the least.
I suppose it would only be a stupid idea for the non Android lovers and boring dudes lacking the love for technology. Negative kids these day
JohnnyTightlips said:
Is this a serious post? Obviously if I am looking to hack a 200$ tablet I am not worried about cost too much. Also your idea is easy but I want it to be integrated and clean. I want it to look nice and not just have wires and mount sitting there.
Click to expand...
Click to collapse
He is trolling.
Sent from my Nexus 7 (2013) using Tapatalk 4
Yes, it's possible, but has some side-effects
Edit: Sorry, didn't see this whole forum section is about the 2013 Nexus 7. But it still might be relevant if anyone dares to do the same hack on a new Nexus 7...
To answer the original question: Yes, it's possible to power the Nexus 7 (old) without battery, but it involves sending power directly to the battery connection inside the Nexus 7, and it seems to have some side-effects.
The battery is a one-cell lithium polymer, which has a max charge of 4.23 V. I hoped the Nexus wouldn't fry when connecting 5 V, and it has worked fine the few minutes I've tested it. No smell of burnt electronics
Here is what I did:
Tear off the tape around the battery cable. You'll see it's soldered to a pcb-board, and the two black and two red wires are soldered together. The two wires in the middle is probably some kind of data-connection to the battery. Will investigate this further later.
Then I soldered loose the cables, so I could use the battery-connector, and soldered both red and black wires to red and black wires in a USB-cable. Drilled a hole in the back-cover right below the NFC-antenna. The back-cover is filled with all sorts of antennas, so scratch carefully with a knife before drilling. Attached some pictures of the process.
Side-effects I've noticed so far:
- It thinks the battery is at 0% and not charging.
- The clock is reset when you turn off the power. But if you have internet it will update from NTP within a minute or so.
- My computer (OS X) can't detect it anymore. So I suspect it doesn't work in USB device-mode anymore, but I'm able to connect a USB-keyboard with an OTG-cable, so it seems to work in host-mode.
Does anyone else have any experience with this, or any ideas why it doesn't work in device-mode? I'm considering adding a small connector so I can use the two extra wires from the battery to the data-wires of the USB-cable (and disconnect when not in use), and then solder a USB female cable to the original battery. That way I can (hopefully) connect the Nexus 7 to my computer when needed, and possibly analyze what the two extra wires is actually used for.
I have CM for Android 4.2, and Timur's USB-rom, but it's probably not needed for this hack, and I will probably install a stock rom if I get this working properly.
Be careful, and don't blame me if you fry your Nexus (or anything else). Be sure to turn off any fast-charge hacks when the battery is disconnected.
You've done some more testing?
I am also trying to connect directly to the car my nexus.
Thanks for the reply
gregersrygg said:
Edit: Sorry, didn't see this whole forum section is about the 2013 Nexus 7. But it still might be relevant if anyone dares to do the same hack on a new Nexus 7...
To answer the original question: Yes, it's possible to power the Nexus 7 (old) without battery, but it involves sending power directly to the battery connection inside the Nexus 7, and it seems to have some side-effects.
The battery is a one-cell lithium polymer, which has a max charge of 4.23 V. I hoped the Nexus wouldn't fry when connecting 5 V, and it has worked fine the few minutes I've tested it. No smell of burnt electronics
Here is what I did:
Tear off the tape around the battery cable. You'll see it's soldered to a pcb-board, and the two black and two red wires are soldered together. The two wires in the middle is probably some kind of data-connection to the battery. Will investigate this further later.
Then I soldered loose the cables, so I could use the battery-connector, and soldered both red and black wires to red and black wires in a USB-cable. Drilled a hole in the back-cover right below the NFC-antenna. The back-cover is filled with all sorts of antennas, so scratch carefully with a knife before drilling. Attached some pictures of the process.
Side-effects I've noticed so far:
- It thinks the battery is at 0% and not charging.
- The clock is reset when you turn off the power. But if you have internet it will update from NTP within a minute or so.
- My computer (OS X) can't detect it anymore. So I suspect it doesn't work in USB device-mode anymore, but I'm able to connect a USB-keyboard with an OTG-cable, so it seems to work in host-mode.
Does anyone else have any experience with this, or any ideas why it doesn't work in device-mode? I'm considering adding a small connector so I can use the two extra wires from the battery to the data-wires of the USB-cable (and disconnect when not in use), and then solder a USB female cable to the original battery. That way I can (hopefully) connect the Nexus 7 to my computer when needed, and possibly analyze what the two extra wires is actually used for.
I have CM for Android 4.2, and Timur's USB-rom, but it's probably not needed for this hack, and I will probably install a stock rom if I get this working properly.
Be careful, and don't blame me if you fry your Nexus (or anything else). Be sure to turn off any fast-charge hacks when the battery is disconnected.
Click to expand...
Click to collapse