Develop Bugs

In car battery charging

I have travelled to devon on Saturday and used Google maps navigation which is simply superb as u could see the traffic jams in advance (believe me there were plenty of them) I had my phone charger charging my desire but the battery drained still any idea why surely the charger should charge it or keep the power at the same level ?
Sent from my HTC Desire using XDA App

Anyone surely someone must know why the car charger hasn't enough power to charge the phone when running navigation and the normal phone functions
Sent from my HTC Desire using XDA App

I have no solution but I have the same problem. Quite frustrating.

You need a charger that outputs at least 1000mA. Most in-car chargers only output 500mA, and so the phone will discharge quicker than the charger can charge it.
Regards,
Dave

foxmeister said:
You need a charger that outputs at least 1000mA. Most in-car chargers only output 500mA, and so the phone will discharge quicker than the charger can charge it.
Regards,
Dave
Click to expand...
Click to collapse
especially with some GPS apps that consume lots of juice...

Any suggestions which are the best chargers ? Does anyone know what the new HTC dock will incorporate ?
Sent from my HTC Desire using XDA App

Get a cheap USB cable extender, cut it in half and short the middle 2 pins. Don't remember what colours they are. Look on Wikipedia.
I had same problem. Not anymore. Charges properly when I plug in through the custom cable.

This is a common problem.
It bugged me sufficiently that I investigated it in detail.
The Desire, and presumably some (all?) other HTC phones, employ relatively complex charging circuitry.
When you plug a USB cable into the phone, the phone does at least two different checks to determine what type of power source you have just connected.
If you have plugged in a mains powered official HTC charger, which has a rated output of 1A, then the phone knows that it is safe to draw a maximum of 1A from that charger.
The phone will then draw enough current to power itself and, on top of that, charge the battery at the same time.
This current will typically be in the region of 800mA (0.8A) to 900mA (0.9A).
Under these conditions there is enough current to power all the functions of the phone, including WiFi, Bluetooth and GPS, as well as the usual GSM radio and the phone's other functions, as well as being able to charge the battery.
However, if the phone believes that it is connected to a power source with a lower rating such as a standard USB port, then it will limit the maximum current that it draws from that power source to between 400mA (0.4A) and 500mA (0.5A) as this is the maximum officially provided by a USB port.
In other words, the phone is intelligent enough not to overload a standard USB port but, when more power is available, it is able to use it.
The mechanism that HTC uses to detect a power supply capable of supplying 1A, as opposed to a USB port, is very simple indeed.
When the phone detects that an external power source has been connected, it checks to see if the two data lines of the USB connector on the bottom of the phone have been short-circuited.
If they have been short-circuited, the phone takes this to mean that a suitable power source has been connected providing a current of at least 1A.
If the data lines are not short-circuited, the phone assumes that the power is coming from a USB port or other device not capable of providing more than 500mA.
In practice, the way this has been implemented is that within the official mains powered HTC charger, the two data pins of the USB connector are shorted together.
As soon as you connect this charger to the Desire, the phone detects the short-circuit and knows that it is connected to a charger capable of supplying 1A.
This particular trick seems to be something unique to HTC rather than being a universal standard, although this is a bit of a guess on my part based on having looked at only a few other chargers.
What this means is that if you have a car charger that is rated at 1A or higher, your HTC Desire will still only draw a maximum of 500mA from this charger.
This problem is easily rectified by opening up the charger and soldering together the two centre pens of the USB connector so that the phone sees this short-circuit and realises that it can safely draw I higher current from the charger.
Unless you know what you are doing and fully understand what I have explained above, then please don't go fiddling around with your charger.
I have carried out this modification myself on a couple of non-HTC mains-powered chargers and a couple of 12V car chargers with 100% success.
I have, however, found that some 12V chargers, even though they are rated at 1A or even 1.5A do not result in the Desire drawing the expected current.
What I found was that the phone would draw only about 250mA and then, after I had shorted the data terminals within the charger, the phone would draw about 450mA but not the 850mA or so that I had expected.
I have yet to determine with certainty why this is but it appears that as the phone begins to draw current from the charger it is able to detect if there is even a relatively small dip in the voltage coming from the charger and, if so, the phone backs off on the amount of current that it draws.
I will be doing a few more tests in my electronics lab to try and get to the bottom of this and provide a more detailed analysis and, hopefully, a useful solution.
In the meantime though, I have at least solved the problem that I was having and, based on numerous forum posts, the same problem that many other people have been having with car chargers not effectively charging the Desire.
Tim

mercianary said:
Get a cheap USB cable extender, cut it in half and short the middle 2 pins. Don't remember what colours they are. Look on Wikipedia.
I had same problem. Not anymore. Charges properly when I plug in through the custom cable.
Click to expand...
Click to collapse
Snap!
I didn't see your post before making mine (above) but my experimentation agrees fully with what you've said.
You can do it the way you've described, by modifying a cable, or you can do it inside the charger itself.
Just make sure that the cable going to the phone has all four USB wires in it. Some of them only have the two power wires, so the phone will never detect the short circuited data lines.
Tim

If you do not want to open your car charger, you can always create a male to female adapter that shots D+ and D- on the female side like the one in the attached picture
Obviously, the charger needs to be able to provide the 1Amps that are needed. If not, it will at best shutdown in protection mode, at worst fry completely with a great chance of fire...

Interesting stuff...
I bought an official HTC car charger and noticed that the included usb cable, when plugged into a pc, does not allow data transfer, only charging.
Can anyone explain that ? Why would there be a difference in the wiring ?

They want you to buy an official USB cable I guess ? Considering any microusb cable works I'm surprised they bother

Maybe because they just put the two VCC and GND wires in there, thus saving on the cabling cost.

Ok how about this then......
I have a USB port I'm my car (to plug in music on a dongle I presume) if I use the USB lead from my charger supplied with the phone (which also works as a data cable) I get a the charging status icon on the battery bar.
So......
Is my phone charging at 1 amp on the car, and at home or am I getting 0.5 on both or something else?
Sent from my HTC Desire using XDA App

_Crusoe_ said:
Ok how about this then......
I have a USB port I'm my car (to plug in music on a dongle I presume) if I use the USB lead from my charger supplied with the phone (which also works as a data cable) I get a the charging status icon on the battery bar.
So......
Is my phone charging at 1 amp on the car, and at home or am I getting 0.5 on both or something else?
Sent from my HTC Desire using XDA App
Click to expand...
Click to collapse
If you check your battery stats by dialing *#*#4636#*#* and look at battery info, then you can see if it is charged by USB (max 500 mA) or at AC (more then 500mA)

I bought the official HTC charger, works perfectly.

thanks a lot for the explanation. I went for an uprated USB car charger but was still using normal cables to plug into it and the phone wasnt keeping up when bluetooth and GPS was on and was flat by the end of a long journey. Have tried the mod and phone is showing as plugged into AC so hopefully this is going to sort my issues.

So am I right in saying that, unless you get one which has been adapted as described above, there is no real difference between one in-car charger and another - none of them will be up to the job of keeping the phone full of jiuce whilst running GPS over a long journey.
Was thinking of shelling out for a Brodit kit, but at £50+, I'll stick with a cheap one.

Narco77 said:
Interesting stuff...
I bought an official HTC car charger and noticed that the included usb cable, when plugged into a pc, does not allow data transfer, only charging.
Can anyone explain that ? Why would there be a difference in the wiring ?
Click to expand...
Click to collapse
I got the offical charger and the usb cable is fine for data transfer.

Bingo Accent said:
So am I right in saying that, unless you get one which has been adapted as described above, there is no real difference between one in-car charger and another - none of them will be up to the job of keeping the phone full of jiuce whilst running GPS over a long journey.
Click to expand...
Click to collapse
Not really.
For the "mod" to work, your charger must be able to source at least 1000mA which most can't anyway.
So you first have to find a charger that does and then, if it's not already the case, short the D+ and D- cables together.
Note that this can be done by disassembling the charger (not being sure of being able to put it back together), by using conductive glue on the USB plug itself (a bit invasive) or by using an adapter like the one I shown in my previous message (but you need to do it yourself or have someone do it for you)

Battery does not charge when the phone is in use!

Hi guys
Im having a weird problem with the battery. It seems battery doesnt charge when im using the phone although it says and shows it charging! It just stays at the same battery percentage it doesnt charge or drain! When i turn off the screen it charges the battery just fine. I called o2 UK where i bought the phone, the rep said when i use the phone it consumes more power than it gets. Can this be true?! Do you think its just a software bug or defective hardware or defective battery?
Sent from my Galaxy Nexus

This is true if you're charging from the USB on your computer. USB ports only provide 500mA. The phone seems to use more than this if you are actively using it. I recommend using a wall plug that provides at last 1 Amp (1000ma) to effectively charge the phone.

How about car chargers? Same thing happens when its charging with the car charger..
Sent from my Galaxy Nexus

If I'm not mistaken, any car charger, whether it's rated at .5A, 1A, or 2.1A is only going to provide .5A to your phone using a typical USB cable. The USB cable that came with your phone has +/- lines for power as well as 2 data lines. If you pickup a "charging only USB cable" it has the data lines shorted so that only the power lines are functional. This type of cable would allow you to take advantage of the higher current 1A and 2.1A chargers - I think anyway. I'm still new to Nexus so I haven't confirmed that, but that's the way it worked on my old phone. I did read somewhere that even with a charging only cable someone wasn't able to pull 1A from their car charger so I don't know if that was a unique issue or if the Nexus doesn't behave the same way. My understanding is the amount of current pulled from the charger is dependent on the charger AND the phone. Using a special charging cable tricks the phone into thinking it's on A/C I guess.

[Q] Different chargers different results

Hi All,
I am getting intermittent charging results from my HTC One X.
It has been happening for a while with seemingly no pattern other than seems to be getting worse. When the charger is connected the screen wakes up and shows the charge symbol on the battery and looks like it is charging.
However when i check back after a while it has actually lost charge and on occasions an error message "more power being used than being supplied so not charging"
I am running a custom ROM ARHD 9.3.2 which to be fair is absolutely fantastic and not believed to be the issue.
I believed it to be insufficient current being supplied by the charger (and to be honest probably still the issue) but have purposively bought higher current chargers and car chargers and still seeing the issue even when using my laptop and pc cable.
The odd thing is that some chargers work sometimes and them sometimes do not work.
The only consistent charger is the one that comes with it, do they have an apple issue and only work properly with HTC chargers?
Does anyone else have this issue or have I got a possible hardware issue and need to return the phone before warranty runs out?
I travel a lot with work and so need to use other chargers both mains and car
Thanks

What apps are you running when you see the message?
Sent from my HTC One X using xda app-developers app

When you are getting that charging error, or not getting enough power check the charge mode under Settings > Power > Battery Status. If it reads USB then the phone is charging at 500mA or less, which is extremely slow and usually not sufficient while being used for GPS navigation or media streaming.
Even if some chargers are rated 1A, the One X does not draw 1A unless the USB data pins (i.e: D+ and D- pins) of the charger are shorted. This is how the phone knows whether or not the connected power source is a AC/high power charger or a USB port of a PC. I had to manually modify my Belkin car charger to output 1A by shorting out the two data pins. You might have to do something similar or get a USB cable with those pins already shorted to get the maximum current from your high power chargers. However bundled HTC wall chargers work fine without any modifications.

PhoenixFx said:
When you are getting that charging error, or not getting enough power check the charge mode under Settings > Power > Battery Status. If it reads USB then the phone is charging at 500mA or less, which is extremely slow and usually not sufficient while being used for GPS navigation or media streaming.
Even if some chargers are rated 1A, the One X does not draw 1A unless the USB data pins (i.e: D+ and D- pins) of the charger are shorted. This is how the phone knows whether or not the connected power source is a AC/high power charger or a USB port of a PC. I had to manually modify my Belkin car charger to output 1A by shorting out the two data pins. You might have to do something similar or get a USB cable with those pins already shorted to get the maximum current from your high power chargers. However bundled HTC wall chargers work fine without any modifications.
Click to expand...
Click to collapse
Cheers Phoenix, I will investigate this a bit further then

lawrence750 said:
What apps are you running when you see the message?
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
There is no relation to apps running, already looked at that.

[Q] Longer Cable = Less Voltage ?

OK, I was wondering...
I got a 2m cable for my hox, and it seems to work fine.
BUT the charging time is much longer with it!
Like 4.5-5h for full charge!! Why is that?
Does the extra meter looses power?

It depends on the type of charger.
If you look at battery stats does it say charging (AC) or Charging (USB)
Phone chargers have to have a couple of pins shorted out to charge at full speed
Sent from my HTC One X using xda app-developers app

bagofcrap24 said:
It depends on the type of charger.
If you look at battery stats does it say charging (AC) or Charging (USB)
Phone chargers have to have a couple of pins shorted out to charge at full speed
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
It's slower Compered to the Same Charger.
And it says AC too.

V=I*R where V is voltage, I is current and R is resistance. The charger will hold voltage constant at 5 V for USB.
A longer cable increases the resistance of the circuit. This reduces the current, and increases the charge time.

frederuco said:
V=I*R where V is voltage, I is current and R is resistance. The charger will hold voltage constant at 5 V for USB.
A longer cable increases the resistance of the circuit. This reduces the current, and increases the charge time.
Click to expand...
Click to collapse
Ya, Thats what I thought
1. So what is the longest cable I can use without deceasing the current?
2. I tried a new charger that gives 5V 1.5A and it's even slower! (and the
phone says USB CHARGING, why is that?

Strange that a 1.5 A charger ended up slower.
I would say 1-2 meter cable is about the longest I would use for my USB chargers. For my tablet I use a 1 meter cable. Same for my phone (but it is not the same phone you have).

frederuco said:
Strange that a 1.5 A charger ended up slower.
I would say 1-2 meter cable is about the longest I would use for my USB chargers. For my tablet I use a 1 meter cable. Same for my phone (but it is not the same phone you have).
Click to expand...
Click to collapse
How can I know how much output the charger really gives?
2m is too long i think .. it takes about 6h to charge the phone!!

Doorman404 said:
2. I tried a new charger that gives 5V 1.5A and it's even slower! (and the
phone says USB CHARGING, why is that?
Click to expand...
Click to collapse
As i said previously about the shorted pins.
If they are not shorted then it will appear as USB charging.
Even though the charger can provide 1.5amps the phone is limiting the pull to 0.5amps because it thinks its pulling power via USB.
Sent from my HTC One X using xda app-developers app

bagofcrap24 said:
As i said previously about the shorted pins.
If they are not shorted then it will appear as USB charging.
Even though the charger can provide 1.5amps the phone is limiting the pull to 0.5amps because it thinks its pulling power via USB.
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
Oh, I understand, Thanks!
Any way I can Short those connectors myself?
cause I know the phone can take 1.5A from other chargers.

can anyone know when you charge the phone in less then 80% in will charge normally but beyond it, it wil slows the charging down...that will make charging longer...i check this and it only happen in HTC phone...

enumbe many
The difference is not noticable

bagofcrap24 said:
As i said previously about the shorted pins.
If they are not shorted then it will appear as USB charging.
Even though the charger can provide 1.5amps the phone is limiting the pull to 0.5amps because it thinks its pulling power via USB.
Sent from my HTC One X using xda app-developers app
Click to expand...
Click to collapse
IF anyone's intrested, I've found this guide
How to make your phone drew more power from such chargers
http://translate.google.com/transla...tly-reported-64-stingy-reconstruction&act=url
Enjoy

Excellent guide on how to melt the usb driver chip on your motherboard.

BenPope said:
Excellent guide on how to melt the usb driver chip on your motherboard.
Click to expand...
Click to collapse
:laugh: Yep. :laugh:
OR
to use with wall chargers that doesn't give
you the full load. Like in my case

USB Charging Slow

Can someone tell me why is it that when i charge my phone when USB connected to PC its takes hours together to charge and Wall Charger takes 1/4th of that time why is that can anybody tell me what is the login behind it and which is best way to charge ?

USB only outputs 5v, which is why it takes makes longer. You have more power outputted from the ac adapter therefore it charges quicker. Simple as that. They will both eventually charge the device, but it's recommended you use the wall charger all it's faster, no one likes to wait

+1
U cannot compare usb charging with ur charger as output voltage varies across both n btw usb is jst an alternative for charger it's not a replacement
Sent from my LT22i using Tapatalk 2

You can use a custom kernel and change charging current.
Sent from my GT-N7100

Ok thanks Guys to know what is the main difference

Technically, voltage has little to do with charging. The amperage is what counts. USB on a computer gives ~500 milliamp, where ac chargers give 1-2 amps
Sent from my SGH-I997 using xda app-developers app

For a more detailed answer...
All compatible chargers output the same voltage, 5 volts. (Otherwise they just would burn out the charging circuits in the phone. It can happen both if there's too much volts and if there's too little, but for very different reasons.) However, voltage is not the only characteristic of electricity, the other most important is current, that is, amperes. Think of volts as 'water pressure' and amperes as 'amount of water pumped per minute' through a water pipe -- with real water, those are connected, with electricity they're quite separate.
Every source of stabilized electricity you will find in any kind of power supply will have a set voltage it outputs electricity at, and maximum current it can output. Trying to draw more current than it can supply can damage the power supply, so your phone limits the current it attempts to draw when it detects a standard USB port -- to what the USB standard says it should be able to safely supply. For standard ports, it's 500mA. Galaxy Note II by default plays it safe and draws 425mA. The stock AC charger is rated at 2000mA, and Note draws 1700mA when it detects one. This specifically affects the speed of charging -- AC chargers will charge battery faster, because three times more power gets in.
The USB standard was written before everyone and their mother started using it as a charger, and today, USB ports can usually handle more than 425mA, and on some computers they can supply just as much power as the stock AC charger. There are a few standard ways to detect how much current can a phone safely draw from an USB socket, but not all of them are universally accepted or correctly implemented, so the phone always plays it safe when it can't be sure. If you install a custom kernel, you can directly tell it how much power to draw if you know your USB port can handle it.

:good: :good::good::good::good::good:

aukhan said:
:good: :good::good::good::good::good:
Click to expand...
Click to collapse
You can use the app Galaxy Charging Current (GCC) from the S3 thread which can measure the output of the incoming current. It will also allow you to detect faulty cables and chargers, as you will be able to see different ratings with different cables and chargers.
Testing on typical USB ports will get you a reading of 460, while the original charger and a good cable will give you 1800 (about the max current draw for the Note 2).
If you use a known good charger and get a lousy reading, it indicates a bad cable. I once had a cable give a readout of 100. I promptly threw it away.

Yes i am using that thanks nyways