Just an annoying problem with the motors pulsing in Altitude Hold.I don't seem to be able to tune it out entirely. I've disabled the Sonar. The Quad holds altitude quite well but the pulsing upsets the stability a little.Also I'm using 12x8" APC props. Could these be to 'aggressive'? I will be trying 13x5.5" later this week hoping to get smoother thrust.
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All my APM 2.6 and older tricopter and quadcopters are having the same problem. However, on my quad copter when I removed the gimbal and camera, the problem was gone. I though maybe there is some electric interferance, so I installed the camera and gimbal but let them unplugged (no power), and the problem came back. Thanks I removed the camera and gimbal and the problem was gone. I figured it is the weight. So Just to confirm, instead of camera gimbal i installed similar weight (extra battery that was unplugged) and the problem was back again.. I have concluded that it is the excessive weight that is beings in the problem. However, I am not sure what parameters to change to fix this behavior.
Please share if some one know how to fix it. Thanks.
Do you have those bullet connectors along the wiring between ESC and motor ?
My experience with these (on gen 1 ArduCopter) was intermittent bad connectivity that resulted in intermittent motor glitches. By soldering up the connectors solid the twitching was gone. Just 2 cents.
Else a wild guess could be specifically in altitude hold mode that the software access some ports in a way that happen to affect signals related to motor PWM output. Can be a debug issue that for resolving requires intimate knowledge of the processor registry and PWM timer functionality.
What motors (kV) are you using with these props? How many cells in your LiPo? It sounds very much like the motors are hunting, rather than a direct response to a control loop instability.
Replies
All my APM 2.6 and older tricopter and quadcopters are having the same problem. However, on my quad copter when I removed the gimbal and camera, the problem was gone. I though maybe there is some electric interferance, so I installed the camera and gimbal but let them unplugged (no power), and the problem came back. Thanks I removed the camera and gimbal and the problem was gone. I figured it is the weight. So Just to confirm, instead of camera gimbal i installed similar weight (extra battery that was unplugged) and the problem was back again.. I have concluded that it is the excessive weight that is beings in the problem. However, I am not sure what parameters to change to fix this behavior.
Please share if some one know how to fix it. Thanks.
Do you have those bullet connectors along the wiring between ESC and motor ?
My experience with these (on gen 1 ArduCopter) was intermittent bad connectivity
that resulted in intermittent motor glitches. By soldering up the connectors solid
the twitching was gone. Just 2 cents.
Else a wild guess could be specifically in altitude hold mode that the software
access some ports in a way that happen to affect signals related to motor PWM output. Can be a debug issue that for resolving requires intimate knowledge of the processor registry and PWM timer functionality.
What motors (kV) are you using with these props? How many cells in your LiPo? It sounds very much like the motors are hunting, rather than a direct response to a control loop instability.