One motor starts and stops randomly

[Zondre]

Hello

I'm using a modified version of MultiWii 2.0 to get it working with Arduino pro mini 3.3V. All the sensors are working satisfactory, but I have a problem with one of the motors. When arming the motors three of the motors spins off, but the last motor has a problem. It starts and stops randomly and it won't spin continuously, even when I move the throttle. I tested the motor directly with the receiver without any problems, so I'm pretty sure it's a software related problem.

Does anyone know what possibly can be wrong?


Hardware:
Motor: http://www.hobbyking.com/hobbyking/stor ... oduct=2105
ESC: http://www.dealextreme.com/p/mystery-be ... 22?item=24
Tx/Rx: http://www.hobbyking.com/hobbyking/stor ... de_2_.html
IMU: http://www.sparkfun.com/products/10121

Regards
Sondre

[tovrin]

sounds like a wiring issue to me, check all your soldering points, including and especially ground connections.

[UndCon]

Are you using bullet connectors ? They cause me several crashes so I solder my motors instead.

You might also need to increase MIN_THROTTLE a bit to see if it helps.
//UndCon

[tovrin]

undcon, do you think that good conductive grease would fix that issue too? personally, Id hate to cut my very easy to use bullet connectors off.

[UndCon]

I am not sure - the ones I removed had a small collar that could rotate around a pin, this collar is the spring force that holds the connector firmly in place.
I think the problem was all vibrations that makes everything move and the slightest gap causes 1 motor to drop, or even worse reboot the ESC mid air (happened to me)

Verify all connections

//UndCon

[Zondre]

When I wrote the first post I was using this connectors: http://www.google.no/imgres?um=1&hl=no& ... x=78&ty=59

I have now solder all the connections, but still having the same problem. I tried to increase MIN_THROTTLE to 1250, but it didn't help much. At 1250 it almost hover.

[bill516]

Have you tried wiggling the wires that come out of the motor, I have read where some motors have problems with the wires breaking where the heat shrink is. If you can, move the motor to another location see if the fault follows. Recheck your soldering from the board to the motors use a magnifying glass your looking for bad joints, no cracks and a shiny surface. Can you put some pics up of your machine so we can see if there is something obvious to us.

[Zondre]

I tried to change to a 5v Arduino nano and that solved all my problems. Thanks for all the help