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Qi Charging receiver module does not charge out of box.
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Please be positive and constructive with your questions and comments.

Qi Charging receiver module does not charge out of box.

by sirkha on Thu Dec 04, 2014 3:41 am

TL;DR: I bought a Qi charging module (https://www.adafruit.com/product/2114) and connected it to my phone, a second generation Moto X. It didn't work. It seems that my phone requires a data connection to charge. I am not unhappy with my purchase, but a disclaimer on the product page might be warranted for those who may not be able to find other uses for these modules.

I got one of your Qi charging modules.
These:
https://www.adafruit.com/product/2114 (This is the one that I have)
https://www.adafruit.com/product/2115
https://www.adafruit.com/product/2116
https://www.adafruit.com/product/2117
have micro-USB connectors that only have the 5V and GND connections to the phone.

My phone, a 2nd generation Moto X (XT1097) does not support charging +5V, it seems to need a data connection. I confirmed this by putting 5V into it using my bench top power supply and a USB tester with no data lines connected, which, as expected, didn't work.

I would really appreciate some project help to complete the charging case I would like to 3D print and build. Will the receiver module (I bought 5 of the bare PID https://www.adafruit.com/product/1905) support the USB data connection needed for charging? Will I have to get another chip that does the talking to the phone? Do you have any special recommendations on low profile USB connections similar to the one on https://www.adafruit.com/product/2114, but that have all 5 wires? Am I just missing something stupid?

sirkha
 
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Re: Qi Charging receiver module does not charge out of box.

by adafruit_support_mike on Thu Dec 04, 2014 4:54 am

I'll pass your feedback on to our products team.

WRT the data connection, you might not need a full data interface. We know that iPhones look for specific resistances/voltages on the data pins to decide whether they're connected to a compatible charger. It seems reasonable that your phone would do the same.

The easiest way to find out is with sledgehammer reverse-engineering: find a cheap or broken charger that's known to work with the phone, crack it open, and look for resistors.

You might be able to find information about your phone's charging requirements online, but aside from suggesting a Google search I don't know where you'd find it.

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Re: Qi Charging receiver module does not charge out of box.

by sirkha on Thu Dec 04, 2014 6:23 am

Thanks for the quick reply, that definitely led me down the right path. A bit of googling brought me to your mintyboost tutorial (https://learn.adafruit.com/minty-boost/icharging) which convinced me to try different voltages on the data pin. When that didn't work, a bit of experimenting got me to try shorting the data pins together, and that worked. Now I just need to find a tiny connector where the pins are shorted together.

sirkha
 
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Joined: Wed Jan 22, 2014 7:18 am

Re: Qi Charging receiver module does not charge out of box.

by adafruit_support_mike on Thu Dec 04, 2014 5:53 pm

We have a couple of micro-USB shells that you can wire however you want:

https://www.adafruit.com/products/1826
https://www.adafruit.com/products/1390

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Re: Qi Charging receiver module does not charge out of box.

by sirkha on Fri Dec 05, 2014 5:34 am

The problem I am trying to solve is to mimic the profile on the USB Qi charger you have, but with the data pins shorted. I was considering getting one of the shells, https://www.adafruit.com/products/1390 and doing some creative plastic removal and soldering the leads i need shorted together, but instead I ended up taking apart the cable from https://www.adafruit.com/products/1566 apart and it had the data lines shorted *on the connector* already so I removed some of the excess plastic and plan to do some 3D printing to integrate it into a case.
15763742160_f806a92502_z.jpg
15763742160_f806a92502_z.jpg (40.84 KiB) Viewed 290 times

sirkha
 
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Joined: Wed Jan 22, 2014 7:18 am

Please be positive and constructive with your questions and comments.