Hi all…new guy here. I’ve read through the forums a bit and not found anyone with a similar issue, so I am hoping someone will be willing to help out directly.
First, my setup: I’ve got a DJI F550 hexacopter, with an APM 2.6 w/external GPS attached to an AR8000 receiver, and a Spektrum DX8 transmitter. I’ve got ArduCopter 3.2 on the APM, and am using Mission Planner 1.3.19 as my ground station. I’ve flown the copter a handful of times before (like I said, new guy), but a hard landing (what some might refer to as a “crash”) this past May led me to putting the copter away for a bit. Now that I’ve got some free time again I am wanting to get this back in the air and learn how to fly it properly.
My problem? I can’t arm the copter. Trying to do so gives me nothing…no beeps, no double-flashing red light, no error message in the artificial horizon display. The reason I wonder about the accelerometer is that when the copter is on my bench and plugged in to my laptop, the display shows my ground speed, altitude, yaw, and vertical speed all constantly changing. Is it possible that the crash (er, hard landing) last year could have broken something? There are no other symptoms of problems - I don’t get any errors, I was able to go through all the calibration steps without difficulty, etc. But to look at the instruments, you would think I was bouncing the craft around like a yo-yo.
I’ve attached a screenshot of my mission planner display. On it, the roll, pitch, yaw, altitude, verticalspeed, alt_error and ber_error values are all in constant motion. Interestingly, if I pick up the copter and move it about, the AH responds perfectly normally. It’s as though the system just can’t find and hold a zero value.
Finally, two last observations. One, don’t worry about the ‘RTL’ shown in the AH display; this was just for screencap purposes, it’s always in ‘Stabilize’ when I try to arm. And two, disabling all of the pre-arming checks doesn’t let me arm the system, I still get no response. I don’t know if this means anything or not.