Bitcraze Forums

I've made a bit of a mess of my crazyflie when soldering the motors on, due to impatience and using far too big a tip.

I don't have a PS3 controller yet so I haven't been able to test-fly it; I was hoping I could test fire the motors from the PC software

When I switch it on, M1 and M4 spin. I am assuming that all four rotors should spin. Is this correct?

Yes, all 4 motors should spin.. also have a look at the LED Indications. The blue leds should be lit, and the green leds should make 5 quick flashes
Did you watch the Assemling Video?

Yes, all of the 4 motors should spin when you power it on. Be careful when soldering so you don't short circuit the motor pads to the resistor net for the regulator. Have a look at this post. An remember to disconnect the battery when soldering.

/Marcus

Thanks, guys. I made sure there weren't any shorts. I managed to get M3 working but the connections for M2 are pretty much melted away.

I'm going to buy some smaller tips for the iron, and a big magnifying glass. Take off the connections for M2, see if I can scrape back some lacquer (is that right?) to get a decent connection to solder to for the M2 motor.

Feeling a little bit stupid about now

Ok, I'm about to give up on this board. I can't get the solder to stick to the board since there's no pad for it to stick to.

Is it possible to buy just a replacement board rather than the whole kit? And if so, anyone know how much?

Cheers,
KEv.

Since I messed up the contacts for the motor, I'm going to try and work around them. Looking at the schematics, pin 1 from M2 goes to D2 so I've soldered the wire directly there. Now, pin 2 goes to the "D" of Q2, but I just wondered if someone can tell me which pin is "D"? looking at the schematics and the layout I would assume that it is the "top right" pin, can anyone confirm?

My flie is going to look a mess, but I would like to get all four motors running

rincewind23 wrote:Since I messed up the contacts for the motor, I'm going to try and work around them. Looking at the schematics, pin 1 from M2 goes to D2 so I've soldered the wire directly there. Now, pin 2 goes to the "D" of Q2, but I just wondered if someone can tell me which pin is "D"? looking at the schematics and the layout I would assume that it is the "top right" pin, can anyone confirm?

My flie is going to look a mess, but I would like to get all four motors running

The drain pin on the PMV31XN FET is pin 3 which is the pin on the side all by its self.

Thanks for that, atomicdog. I have attempted to re-wire accordingly. It still doesn't power M2 on startup, though..

Doing some checks with the multimeter, I noticed that across D1, D3 and D4 I get 2.5 ohms resistance, but across D2 I get about 0.1-0.2. Even to my untrained mind, this must be a problem?

rincewind23 wrote:Thanks for that, atomicdog. I have attempted to re-wire accordingly. It still doesn't power M2 on startup, though..

Doing some checks with the multimeter, I noticed that across D1, D3 and D4 I get 2.5 ohms resistance, but across D2 I get about 0.1-0.2. Even to my untrained mind, this must be a problem?

You either have a short or the motor is fried.

Fortunately the motor was not fried. Unfortunately when I took the diode off the board, there is infinite resistance on the diode in both directions. Can anyone tell me what diode D2? Maybe I can replace it and get my board fully working..