3DR Quad
Pixhawk
ArduCopter V3.1.5
3DR GPS/Compass Module
FS-TH9X Fly Sky FS-TM002 Radio/ Fly Sky FS-R9B receiver
3DR PPM Encoder
1.3.9 Mission Planner
Problem:
When I power on the Quad, the Pixhawk’s Main LED Flashes yellow slowly, and I can’t arm. When I am connected over MavLink with the 3DR Radio I can see the “PreArm: Check FS_THR_VALUE” Message on the Flight Data Screen.
Attempted Fix:
First I made sure the RC was connected by going to the radio calibration screen and watching the inputs change when I move my RC sticks.
Second, I recorded the minimum throttle PwM value when the throttle was at MIN, and when the RC was powered off. RC off 900 - Min throttle 1056. I set the throttle fail save value to 920, 950, and 1040.
I also tried turning off the fail safe. Doing this didn’t let me arm, but I didn’t see the thr_FS message on the flight screen.
I read that the flashing yellow LED on the Pixhawk indicates a radio check failure. I don’t understand this, because I can go to the status screen and see the radio inputs change while the LED is flashing yellow.
BTW, everything was working until I loaded and wrote new parameters to the Quad while trying to fix a Yaw problem. I’ve tried re-writing the old parameters. I also did a new radio calibration after that when I discovered the new problem.
Any suggestions?
Thanks,
Rich