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.
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Found the answer here: http://www.diydrones.com/forum/topics/arducopter-2-5-released?xg_so...
It was the TRIM_THROTTLE parameter.
Hm, looking at my logs... The sonar alt goes crazy often. Maybe some kind of noise or bad connection.