Folks, I have sore fingers and a scratched wall :)
I've just loaded 2.7 on my APM2 and needed to reset the gimbal settings.
The quad was powered with the lipo and disarmed with the tx standing next to the quad.
As I put the gimbal's servo cable onto the 3 pins for the, well, servo, the ESC started making funny beeping noises and two of the motors spun up. One skimmed and eventually jammed against the wall, the other was stopped by the presence of my finger. I immediately pulled the cable off (it was hardly home) but it continued. The only way was to disconnect the lipo.
How could the disarmed ESCs decide to spin the motors? I tried everything again and nothing happened.
Cheers,
Crispin
Replies
my APM2 has random arming wierdness when i turn off or turn on the Tx ,
but only if its armed when i make the power change,
for example, i land the quad on my bed after making the first few flight tests, it stays armed, i turn off the tx, move the battery a bit to have better weight ditsribution, turn on the Tx and BAM!!! all four motors to 100% during the Tx bootup, they were very nearly stopped by my face, but luckily i could react quickly enough to hold the APM board down and nothing got mangled,
In your case, I would be temped to suggest some bad connection which passed through from the servo channel to the motor channel, or maybe a bit of a voltage drop as you connected the servo caused APM to recognise the same wierdness as when i turn back on my Tx
Esc's cannot be disarmed. It's the APM that is disarmed, which means it should send 0 throttle to the esc, regardless of the throttle stick position. That's all there is to being disarmed.
If the motors started spinning, somehow the APM sent valid >0 throttle signals to the escs. Could be because the APM was rebooting due to a voltage drop from connecting the servo.