My APM powered quadcopter has a persistent pitch signal even when my controls are all in neutral. In other words, upon take off, there is a constant and persistent pitch+yaw signal being sent to the motors. So the effect is a sort of spiral of doom before coming back down to the ground.
I’ve checked and re-checked all calibrations, balance, motors, ESCs, and everything else I could think of. At this point I am out of ideas, which is why I have come to ask for your advice.
Does anyone have any idea what could be causing this unwanted “baseline” signal? More importantly, what parameters could I even look at in order to correct this behavior?
Sorry, I am new to APM. I’m having trouble downloading the logs, nothing shows up.
However, below is a screenshot of the raw servo output to motor 3 and motor 4 (yes, I have checked, re-checked, and re-re-checked that motors, proprs, and ESCs are all setup correctly). Clearly motor 3 is being given an incorrect signal.
Signal to motor 3, motor 4 (in X configuration) while quad is kept level. I can see with my eyes that motor 3 is spinning slower than the rest. i.imgur.com/Taed0KO.png
I’ve tested and eliminated:
Prop
Motor
ESC
PDB
ESC, Accelerometer, Magnetometer, Radio calibration
Somewhere between sensor inputs and sending the signal via PDB to ESC, the motor gets an unwanted signal and I have no idea where to go from here.
I have fixed the issue. Unfortunately, I’m still not sure what was going wrong. What fixed the problem was re-flashing the software onto the flight controller and re-doing all calibrations and parameter settings. My best guess is that perhaps early on in my learning of the systems, I may have changed a parameter without fully understanding the implications.
Regardless, I’ve now had a successful first flight of my custom quad!
