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iPhone 4 Charging Not Supported on the this Device

by whyisjake on Thu Aug 04, 2011 11:34 am

I just built the Minty Boost this morning hoping to take it on a backpacking trip to the Tetons this weekend. It is saying that the device is not supported when I plug in my phone. It does however work when I plug in a co workers iPhone 3Gs. The pins are reading five volts/1.92 volts.

Jake
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Top of the Minty Boost
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Solder point of the Minty Boost
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Re: iPhone 4 Charging Not Supported on the this Device

by whyisjake on Thu Aug 04, 2011 11:35 am

Of note, I was using the cable that came with the phone and Energizer alkaline batteries.
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Re: iPhone 4 Charging Not Supported on the this Device

by adafruit_support_bill on Thu Aug 04, 2011 11:44 am

It does however work when I plug in a co workers iPhone 3Gs.

That's a switch! Usually the 3Gs are the most finicky to charge.

Are your voltage measurements with the phone plugged in?
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Re: iPhone 4 Charging Not Supported on the this Device

by whyisjake on Thu Aug 04, 2011 11:49 am

adafruit_support wrote:Are your voltage measurements with the phone plugged in?


I just tested the voltage with it plugged in, and got the same readings.
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Re: iPhone 4 Charging Not Supported on the this Device

by adafruit_support_bill on Thu Aug 04, 2011 12:14 pm

The 1.92v is slightly low for the data lines. You could try swapping out the 75K resistors for something like 68K to boost that up a bit. But you might want to calibrate your meter against a known voltage first to be sure that is an accurate measurement.
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Re: iPhone 4 Charging Not Supported on the this Device

by whyisjake on Thu Aug 04, 2011 12:28 pm

Turns out it was a 3G that works, not a 3Gs.

Also, does charge a Droid X. We put in some nickel metal hydride batteries, and that worked...
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