Copter falls out of sky when entering Alt Hold, posHold, Loiter

ArduCopter Copter 4.0
1

Hi!

I bought a pixhawk for the posHold feature, but am having trouble getting it to work. I have my 10" multirotor flying manually in Stabilize/Acro mode, but whenever I try to enter Alt Hold, Pos Hold, or loiter(with receiver switches), the copter stops spinning motors and falls to the ground. Exiting those modes starts the motors again.

The multirotor has 3D GPS lock when armed.

Attached is the logs of a short flight demonstrating this behavior.
00000015.BIN (484 KB) 00000015.log (979.0 KB)

Am I missing some configuration? Any help would be appreciated.

Thanks in advance!

2

Hi @tuckjohn
your chancel 5 and 7 are bonded together (maybe you configured like this in your radio control) and channel 7 configured as emergency motor stop

Screenshot_13
Screenshot_131684×281 21.1 KB

every time you switched to AltHold, motor emergency stop function was activated
Screenshot_12
Screenshot_121718×605 28.5 KB

3

Wow! Sounds so obvious in hindsight.

Yeah, I mixed those channels in my transmitter to be able to switch between 4 flight modes with only two switches.

Thanks for your help!

4

Why would you need to do this for 4 flight modes? What radio do you have?

5

Spektrum DX6i. It doesn’t have any knobs, only two-position switches

6

Yea, I had one of those. Not the greatest for Arducopter. Personal preference (or just what you have) I know but i wouldn’t use a radio that wasn’t OpenTx capable.