APM loud sustained beep

I'm trying to connect my APM 2.5 to the mission planner software.  When I plug in the USB the the APM starts up and the A & C lights start flashing, however after a few seconds the board lets out a loud sustained beep and does not end until I remove the USB.  

I'm not sure where to start to diagnose this problem.  Any ideas?

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –


  • @Thomas,

    You are right.  I figured out the sound is coming from a dongle which is connected the sixth place of what I'm guessing are the aux ports on the side of the board.  When I unplug it, the noise obviously stops.

    I should probably add that this copter was the qu4d built by steadidrone.

  • Admin


    To the best of my knowledge the APM2.5s sold by 3DR do not have a speaker onboard so are you sure the loud, sustained beep is coming from the APM. Are you sure it is not coming from the PC/laptop that you are running the MP on? Do you have any ESCs and motors hooked to the APM servo output?

    Did you purchase your APM from 3DR or is it a clone?


    TCIII ArduRover2 Developer

This reply was deleted.


Hiroki Tanaka liked Hiroki Tanaka's profile
Oct 13
Derrick Davies liked lisa TDrones's profile
Sep 23