I've been playing with the PXFMini and Pi3b+ and have most of it working, but can't seem to get a stable flying copter.
This is my current setup:
- ZMR250 frame with arm extenders
- 3S 3000mah LiPo
- Wrath32 BLheli_32 ESCs
- Returner R5 2306 Motors
- 5030 Triblade Props
- Ublox NEO-M8N GPS & Compass
With a Pi Zero and the Erle image, it flies fine. Haven't done much testing yet, but have it in the air hovering to an extent, GPS working etc.
With the Pi 3b+, using the apm-copter-3.5-stable-erlebrain or the 3.6dev adrucopter firmware, I can get everything working (including a TFMini rangefinder as it's v3.6), but cannot get it off the ground. It seems like a tuning issue, but I'm not experienced enough to know what to tweak. The PID values all look similar or the same as others I've seem posted, but violent shaking backing and forth as soon as any throttle is applied.
When holding it, twisting to simulate yaw seems to quieten it slightly.
Here's the servo1-4 output, it's the best graph I can find to demonstrate the behaviour.
Let me know what else would be useful to diagnose - I can video tomorrow when the house is awake again.
Any ideas Gurus?