Hi, I`m going crazy.

My Hexa didn´t work well and I recalibrated accelerometers, transmiter, etc, etc. I checked the motors and everything was well but the Hexa didn`t work well.

I have a strange problem with the motor output number 8.

If I connect this motor to Ardupilot, this has not force but if I connect this motor another receiver this works very well.

I have disconnected every motors less number 8 and this has not force, I thought the motor was brned but when I have connected it another receiver it works perfectly.

The Hexa has been flying perfectly with Ardu Pirates and Arducopter 2.0.17 and now it does not work well.

I have not changed hardware or anything.

What could it be?

Thanks.

 

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  • Developer

     

     

    According to Ardupilot Mega Schematics v 1.2,  PWM Outputs 7 and 8 do comes from PE5 and PE4 AVR Mega outputs.

    PWM Outputs 1 to 4 do come from the multiplexer circuit 74LS157.

     

    Port E on AVR Mega does not have high driving capabilities. Only port B has high current outputs. It is possible that PE4 and PE5 AVR outputs do not have enough drive capability for your ESC.

     

    Or you could have a problem on your AVR Mega chip, or a short on this output with an adjacent wire, or a bad solder somewhere.

    Eventually a problem on the ESC input (too low impedance). Did you try another ESC ? A too low impedance input on your ESC could work on a receiver output, but not on the port E AVR output.

     

    Last, could be a problem in the code, but this is less probable.

     

    If i remember a discussion i had a few weeks ago a Ardupirate developper has reported that some AVR outputs could become wrong after overloading.

     

    If you can put a scope on this output and compare with other outputs, you will get your answer. if you see a distorded signal, then you have a hardware problem. If you see only bad pulse timings, then it's probably a software problem.

     

    I would vote for the hardware problem with 75 % confidence.


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