Bitcraze Forums

Hello
I have a problem. After my Crzyflie fall during flight from a height (about 1 meter or less), blue LED not work. When I picked it up, I smelled like something was burning (perhaps as burning plastic), I immediately disconnected the battery, and soon after that the smell was gone. When I turn it on, blue light is up for a second and then goes out and is no longer lit. Also I think, that battery charding not work too.

Thnak you

Something has most likely shorted. First try to use your nose to locate any burnt smelling component, probably one of the transistors located next to the motor connectors.
Next step would be to power it only from USB by removing the battery and inserting the USB cable. Does it work now? Then it is definitely a transistor that has shorted. These can be replaced if you have some moderate soldering skills.

I just assembled my crazyflie and it was fyling completely instable during the first tries. I found the M1 soldering pretty dirty so i tried to resoldered it. After tring to fly again all motors were working nicely but exactly as instable as the first time. After triing to fly it for about 10 seconds there was smoke coming out of somewhere in the centre of the crazyflie, i actually was too surprised to locate the exakt origin of it. Now i can't get the blue led get to work again, even after removing M1 completely. I was looking for shorts but the M1 connectors now look very clean compared to the other working M2 to M4 connectos, i can't find any obvious shorts anywhere.

Did I break the crazyflie allready? The 3 other Motors work perfectly, I can connect and "control" it ...

With some soldering skills most things are fixable. Do you have a multimeter? If so can you check if VCC-DGND is shorted (close to 0 ohm), there are some pads marked VCC & DGND in the middle of the board where you can measure. Do all these tests with the battery unconnected. Connect the USB cable and try to find if something gets hot (the USB is limited to 100mA).

Did I break the crazyflie allready? The 3 other Motors work perfectly, I can connect and "control" it ...

Even with the blue led not light up can you still connect to it?

Thanks for these hints. I will have the chance to use a multimeters in a couple of weeks, i will definitely try this.

Yes, I can connect and control to the CF as nothing happened, i'm able to charge it and receive correct logging data in the pc client, only the blue LEDs aren't working. Actually I thought the smoke's origin was somewhere between the center and the corner of the blue leds.