Dear DiyDroners, APM experts,
First of all, I would like to thank you. Do made something great and unbeatable.
Im creating this topic, because I have some sort of a configuration issue. After trying several things suggested across these forums, I still wasnt able to solve it.
ZMR 250 frame, APM mini 3.1 (please forgive me, im using cheap parts from china), with GPS, external compass, etc.., MT1806 motors, vibration dampening, 5x4.5 props, 3s 2200mah lipo. PCB-PDB with LC filter, step down regulators, minimosd
Copter does not perform well in AltHold, Loiter, etc. There seems to be some throttle problem. The copter jumps up/down. This also leads to the copter almost falls back when levels out of a 10km/h speed.
What I've tried:
Balanced motors, balanced props, added vibration dampening, made sure there is a foam covering the baro.
The copter files well in stab or acro, no oscillation. The pids are not perfect, but easily flyable and seems to be ok.
My vibration levels are +-1 on accx, accy around 0. Accz is a bit higher +-2 around 9.8.
I'm feeling a bit hopeless now, if you have any idea, please let me know.
Also if you think its because the parts i have (eg. i should use pixhawk instead), please also let me know.
I'm not new to the field, but I'm still a noob, I'm building this drone for more than a year now. I had a long time frame when it was holding altitude well, but a lot of things changed since than. New props, new PDB, new firmware, new camera, a small servo moving the camera (powered from 5v step down regulator, not from APM), so I dont knwo what the issue is. I have another 500 sized copter having the same issue with about the same electronics and same firmware.