Hi all, I had sonar ()MB1200/EZ0) altitude hold working fine with my arducopter APM1 1280 board. Just upgraded to APM2 purple board and now when I switch to alt hold the copter drops to the ground. Sonar altitude numbers look fine when I test it indoors using the APM planner. Help! Attached are some flight logs.
Hm, looking at my logs... The sonar alt goes crazy often. Maybe some kind of noise or bad connection.
Found the answer here: http://www.diydrones.com/forum/topics/arducopter-2-5-released?xg_so...
It was the TRIM_THROTTLE parameter.