Bitcraze Forums

Hello !
I installed the QI deck. But nothing happens...
Voltage between GND and VCOM is only 3.7 volts...
The charger is Samsung EP-PG920I
Jean-Claude

Is the LED on the QI deck lit-up when you put it on the charger? You can put the QI deck on the charger without the Crazyflie to test more easily. Most of the time you will have to precisely put the deck in the middle of the charger for it to work.

Yes, the LED lits green. Is it a way to measure the voltage ?

You can measure the VUSB-GND voltage on the Qi deck (same pinout as the deck expansion port). It should read close to 5V.

Hello, thank your for your help.
I'll test this solution as soon I get my new cf2 (see another post relative to PS3 joystick use).
Sincerely
Jean-Claude

Unfortunately, no change... The LED light up a few seconds then light down.
Jean-Claude

Do you have any other Qi charger you could try with? The behavior could come from that the coil is not centered/close enough or that the Qi charger shuts down because of low consumption.

Hello Tobias
If the coil is not centered or too far, nothing happens. Finding hardly the right position the light comes up then down after a few seconds. I have no other QI charger.
I suspect that the problem comes from the fact that my charger is adapted to Samsung smartphone and thus is not 5V.
Jean-Claude

This is strange, we have not observed before that the LED light up and then goes off. Does you charger pad has an indication of charge? For reference this is the behavior we have observed with our charger: https://coub.com/view/vmuk4

I do not think there should be a problem of voltage, as long as the charger is compatible with the QI standard it should work. We have also tried with a Samsung charger and it was working.

I will make a test and take a video...