Troubleshoot and repair your robot transmitter mixing problems.

Run Amok Mixer Fixer
Find and Solve your Robot Channel Mixing Problems


Click / Tap the ◯ next to your answer:
  • Is mixing provided by the transmitter or by an on-board module?
  • Robot uses transmitter mixing (Elevon / Delta Wing).
    • What does the robot do when you push the control stick 'Forward'?
    • Robot correctly responds to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • Robot correctly responds to 'Right' command.
        • If your mix responds correctly to 'Forward' and 'Right' commands the transmitter mix setup is correct.

          If something is still awry send me an email at the address at the bottom of this page and tell me what's going on.

      • Robot spins 'Left' in response to 'Right' command.
        • Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports.
    • Robot backs up in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • Robot correctly responds to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports;
          2. Use the 'Reverse' function on your transmitter to reverse the response of both Aileron 'CH1' and Elevator 'CH2'.
      • Robot spins 'Left' in response to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of both Aileron 'CH1' and Elevator 'CH2'.
    • Only one motor spins in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • The motor on the other side spins in response to 'Right' command.
        • You have one of two possible problems:

          1. You have mixing turned off. Check your manuals and turn on either your transmitter mixing or your on-board mixing module as applicable. Or...

          2. You have both transmitter mixing and an on-board mixing module turned on. Decide which one you want to have on and turn the other one off.
      • The same motor spins in response to 'Right' command.
        • This sounds like an ESC or wiring problem.

          Check your ESC and motor connections and make sure the ESCs are plugged into the correct receiver ports: 'CH1' and 'CH2' for an Elevon mix.

    • Robot spins to the right (clockwise) in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • Robot goes straight backward in response to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports;
          2. Use the 'Reverse' function on your transmitter to reverse the response of the receiver port that your left-side drive ESC plugs into - typically Aileron 'CH1' for an Elevon mix.
      • Robot goes straight forward in response to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of the receiver port that your right-side drive ESC plugs into - typically Elevator 'CH2' for an Elevon mix.
    • Robot spins to the left (counter-clockwise) in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?
      • Robot goes straight backward in response to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of the receiver port that your left-side drive ESC plugs into - typically Aileron 'CH1' for an Elevon mix.
      • Robot goes straight forward in response to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports; and
          2. Use the 'Reverse' function on your transmitter to reverse the response of the receiver port that your right-side drive ESC plugs into - typically Elevator 'CH2' for an Elevon mix
  • Robot has on-board mixing by the ESC or a stand-alone mixer.  
    • What does the robot do when you push the control stick 'Forward'?
    • Robot correctly responds to 'Forward' command.
      • Good! What does the robot do when you push the stick 'Right'?"
      • Robot correctly responds to 'Right' command.
        • If your mix responds correctly to 'Forward' and 'Right' commands the mix setup itself is correct.

          If you have an 'Invert' switch that is not working correctly, these two steps should restore correct functioning:

          1. Swap the places of the two Drive ESC or Mixer plugs on your receiver - unplug them and plug them back into each other's ports; and...
          2. Physically reverse the polarity of the power leads to the left motor.

          If you're having other problems, send me an email at the address at the bottom of this page and tell me what's going on.

      • Robot spins 'Left' in response to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of Aileron 'CH1'.
    • Robot backs up in response to 'Forward' command.
      • OK, what does the robot do when you push the stick 'Right'?"
      • Robot correctly responds to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of Elevator 'CH2'.
      • Robot spins 'Left' in response to 'Right' command.
        • Use the 'Reverse' function on your transmitter to reverse the response of both Aileron 'CH1' and Elevator 'CH2'.
    • Only one motor spins in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • The motor on the other side spins in response to 'Right' command.
        • You have one of two possible problems:

          1. You have mixing turned off. Check your manuals and turn on either your transmitter mixing or your on-board mixing module as applicable. Or...

          2. You have both transmitter mixing and an on-board mixing module turned on. Decide which one you want to have on and turn the other one off.
      • The same motor spins in response to 'Right' command.
        • This sounds like an ESC or wiring problem.

          Check your ESC and motor connections and make sure the ESCs are plugged into the correct receiver ports: 'CH1' and 'CH2' for an Elevon mix.

    • Robot spins to the left (counter-clockwise) in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • Robot moves 'Backward' in response to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports; and
          2. Use the 'Reverse' function on your transmitter to reverse the response of both Aileron 'CH1' and Elevator 'CH2';
      • Robot moves 'Forward' in response to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports; and
          2. Use the 'Reverse' function on your transmitter to reverse the response of Aileron 'CH1'.
    • Robot spins to the right (clockwise) in response to 'Forward' command.
      • What does the robot do when you push the stick 'Right'?"
      • Robot moves 'Backward' in response to 'Right' command.
        • Two steps to correct:

          1. Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports; and
          2. Use the 'Reverse' function on your transmitter to reverse the response of Elevator 'CH2'.
      • Robot moves 'Forward' in response to 'Right' command.
        • Swap the places of the two drive ESC plugs on your receiver - unplug them and plug them back into each other's ports.


Usage Notes:


Mix Type - If you are using using a transmitter mix, the troubleshooter assumes an 'Elevon' or 'Delta Wing' mix using Elevator 'CH2' for forward/reverse and Aileron 'CH1' for left/right. If your mix uses other channels, subtitute them for the channels referenced in the solution.


Invert Switch - Some DESCs and mixing modules have an 'Invert' cable that plugs into a switched transmitter channel to reverse throttle response when driving inverted. If you have correct throttle and steering response but your 'Invert' switch just messes up your steering, this two-step fix should get it working:

  1. Swap the places of the two drive control plugs on your receiver - unplug them and plug them back into each other's ports; and...

  2. Physically reverse the polarity of the power leads from the ESC to the right-side motor.


Pistol Grip - 'Pistol Grip' style transmitters as commonly used for R/C cars have a few quirks that can cause difficulty when using them with mixing DESCs or mixing modules. A full walk-thru setting up a 'FlySky FS-GT3B' pistol-grip radio and a 'Scorpion Mini' DESC is available here:

Using Pistol Grip Transmitters with Robot Speed Controllers.


Priority Order - There are often multiple ways to correct a given mixing problem. The troubleshooter picks a solution based on simplicity of implementation.



You can reach Team Run Amok by e-mail at: joerger@toast.net
Run Amok Combat Robotics homepage