Stabilize

[marius.olenici]

Hello,

After playing a while with the CrazyFlie, mostly making it take off and land immediatly, due to it's instability, I wanted to have it behave. Unfortunately, it seems very hard to do so. Even with no pitch, roll or yaw input, simpy lifting it into the air would make it move around a lot and finally crash into a wall. I recently updated the software and now it should also be altitude-hold capable, but I did not find a way to force it to hold a certain altitude. Consequently, it's still unstable.

Can you, please, recommend me a way to stabilize it at least on one axis?

Thank you!

[tobias]

Something sound wrong here. It should be very stable when working correctly. Is it vibrating a lot from unbalanced propellers? When you place the Crazyflie on a level surface does the cfclient output close to zero on roll and pitch?

[marius.olenici]

Sensors work perfectly fine, but for some reason, once it's powered up and throttle goes beyond ~40%, it starts moving in one direction violently. I will do some more testing, though, and let you know the exact behaviour.

LE: After more testing with all sensors indicating values close to 0 (no input other than trust and the copter was rotated so that heading indicated 0 as well) I realized that the misbehaviour might be caused by the transition from ground effect to normal flight, since it loses some lift at that point. Even so, I am not confortable to let it fly on it's own in the room, until I get it to mantain a certain altitude at least, so is that even possible now? In the PC Client I did not find anything related to that (other than an altitude indication), but i did find somewhere that the firmware allows that.

[tobias]

The Crazyflie is not stable enough without some manual control or some other position control such as the Kinect. The altitude hold also needs some manual control as it sometimes tend to go up or down pretty fast. Thas is why a button must be held pressed to be in that mode.