I could use some help with the disarm function. When the drone lands and I move the yaw stick all the way left, the motors keep running for about 10 seconds. This is not a good thing when the drone tips over and the blades keep running trying to make divots in the grass. Is there a way to use full left yaw to immediately turn off the motors? In other words is there a parameter that adjusts the time delay? If not, is there another way? I’m not asking about the 10 second delay after arming. I understand why that is done and I want to leave that one alone.
I disarm in various modes, depending on how I’m flying. I have used STABILIZE, ALT HOLD, LOITER, and AUTO. The worst are STABILIZE and ALT HOLD due to the fact that wind makes the drone move laterally while sitting down on the ground, thus inducing tip-overs. I try to keep the drone from moving side wards on landing, but if its coming towards or away from me, that is difficult to detect. That’s when tip-overs most likely happen, and I need a way to stop the motors fast.
I’m somewhat opposed to a switch using RCx_OPTION because any accidental use of this during flight will have dire consequences. What’s wrong with using full left yaw at zero throttle to stop the motors instantly? As I recall, that’s what PX4 does.
Because it doesn’t disarm instantly. What I suggested by mixing in another action for the disarm switch would reduce the likelihood of accidental disarm but up to you. I have not had a problem with disarming on land. I would suggest using Land Mode, which I frequently use, but if it’s not working in Auto for you it will be the same in Land.
We mix two RC switches in the transmitter. This makes the “emergency stop” function a lot safer: we then need to flip two switches to kill the engines.
I used RC7_OPTION and set it to 31. This allows me to flip an aux switch and disarm immediately on landing. Before I did that occasionally the quad copter would flip over after landing.
Check out the Motor Emergency Stop RC option and assign it to some RC channel. It immediately stops the motors and, if kept long enough, will also eventually disarm. The great thing is that, if released quickly enough, the motors will go back to spinning if disarm has not been triggered. This means that you can arm and then flick the switch on and off and watch the motors spin down and up. It is also great if you see a “landing” that you know will not go well, you can cut the motors when you are low enough to be safe but before the props touch something they shouldn’t.
I have it on a momentary switch on my Tx (the ones that spring back to the original position) so, even if it is accidentally flipped, it will result in the motors cutting for a fraction of a second. When I land I press it the moment the legs touch down and hold it until I hear the disarm beep. Works like a charm.