Hi!

I was wondering if there is a way for me to see the RPM (angular speed) of each of my motors in the flight logs?

Thank you very much! Any insight will be deeply appreciated!

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  • During the flight you can see the SERVO_OUTPUT_RAW mavlink message.

  • Thanks Andre!

    I was wondering if there is a way for me to see flight logs live during a flight. I would like to see how much PWM each motor is getting during real time.

  • As long PWM range is calibrated (and does not "learn" new max along the way)  - it is kind of proportional to the RPM, - with the exception of voltage drops, and PWM changes instantly, while actual RPM takes some time..

    *sensed* RPM/power is a better way to detect minor problems and diagnostic use.  once, when the AP is aware of RPM & Current of each ESC, we will be able to detect all kinds or problems including disintegrated propeller.

  • Thanks for the response, Andre!

    Sorry for not mentioning, yes I am referring to a quadrotor.

    Is it true that the PWM (which can be seen as RCOU in the flight logs on Mission Planner) is proportional to the angular velocity? So theoretically I would just need to find the constant that relates the PWM to the angular velocity?

    Thanks again!

  • Assuming you mean multirotor:

    no, once UAV-CAN ESC's are common, this should be in place, PWM controlled ESC have simplex communication only. 

    On any case, you can add electronics that communicate over mavlink with GCS, and/or CAN/I2C with autopilot and monitor any/all motors if you want, but it requires some electronics and programming skills.

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