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  1. #1

    No PWM signal for ESC 2 and 3


    I am trying to get my first quad flying but got stuck when calibrating the ESC's with the configurator.
    When the ESC's are attached to the receiver they work all fine and obey the transmitter but when attached to the board only 2 rotate.
    (I have the 1.9 version as shield with arduino UNO) When configurating the ESC's (Turnigy 18A plush), motors 1 and 4 where rotating in the + configuration but not 2 nor 3.
    When I attached a scope to these two last pins, they stayed at 5V and where not being modulated as the ones of 1 and 4.
    I tracked the signal to the pins:
    front motor (motor 1) - D03
    rear motor (motor 3) - D09
    right motor (motor 2) - D10
    left motor (motor 4) - D11
    Can anyone help me with how I could get this PWM signals to work for motor 2 and 3?

  2. #2
    Administrator Airwolf's Avatar
    Join Date
    Nov 2010
    Nuremberg, Germany
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    Are you using the latest flight software version (3.0.1)? The problem you describe appeared already in a previous beta version of v3 and was fixed in the latest official release.

  3. #3
    thanks for such quick reply...
    yes i downloaded the 3.0.1 version...
    How did you solution it previously?

  4. #4
    Senior Pilot wooden's Avatar
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    Dec 2011
    Pacific Northwest
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    It's fixed in 3.0.1, so if you're using 3.0.1, it's a hardware issue and not a software issue. There was some strange division of the motor commands for no apparent reason that was causing the PWM signals to be too short (<1000ms) to spin the motors.

    Since you have a scope, test your Arduino to see if you're getting the PWM signal out of pins 9 and 10 with and without the shield attached.

  5. #5
    Thanks I will try and keep you posted

  6. #6
    Senior Pilot
    Join Date
    May 2011
    Canberra, Australia
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    I had the same issue and a software update fixed it for me.



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