Re: Fake a PC connection via USB cable mod to fool the iPod Touch 3

Man-wai Chang wrote:
Why not just find a conventional USB connector, and wire the hub AC adapter
right to the USB connector ?

Because it seems that the iPod refused to charge itself without detecting Windows.


Hmmm. This isn't encouraging. It looks like they *do* play
tricks with D+ and D- on some of their products. But this
doesn't tell me what to do for your model.

http://pinouts.ru/Devices/ipod_pinout.shtml

http://www.instructables.com/id/Ipod-Touch-Charger-100-works/

Since you're an expert with resistors now, perhaps it's time for
a few experiments ? :-)

OK. I see a post here.

http://www.applegazette.com/iphone/you-cant-charge-the-iphone-3g-on-ipod-audio-systems/

"Yvonne says: July 26, 2010 at 8:35 pm

By the way, if you can get inside your old charging devices there is a fairly
simple way to modify them to work with the newer iPods if you are somewhat
handy with a soldering iron.

it works great with my new iPod Touch 3G.

You will need four 47K ohm resistors (1/8 watt is large enough, but any wattage
will work) and possibly a few inches or small gauge wire."

[Note - I've taken the liberty of drawing a diagram of the circuit.]

+5V --------------+-------------+--- +5V
| |
Power 47K 47K
Source | |
on +---> D+ +---> D-
this | |
side 47K 47K
| |
GND --------------+-------------+--- GND
\ /
\______________________/
|
This portion defines the four USB
pins of your charger jack.

What this circuit is doing, is placing 2.5 volts (an intermediate voltage)
on the Data plus and Data minus signals. By using 47K (47000 ohm 1/8 watt)
resistors, the intermediate voltage is exceedingly weak, so cannot harm
anything. If you were to connect a multimeter to the D+ or D- nodes,
you would likely find them at voltages other than exactly 2.5 volts,
due to loading from the iPod. What matters, is whether you see
the charging icon or not.

HTH,
Paul
.

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