Bitcraze Forums

Recently , I succeeded to control the crazyflie by leapmotion. And I have made some parameters changed in order to control it easily.
But, for the parameters of Crazyflie clients, I still have some parameters confusions.
What is the parameter "ASL" mean?(Maybe a wiki page is better than words.)
I identified a hand gesture to command the Crazyflie for hovering attitude,but the Crazyflie couldn't hover stably,in fact the crazyflie drifts(sometimes for a direction and sometimes for another direction) .
So,what should I do? I have adjusted the center of mass and it seems that I have to set the trim of pitch and roll before each flight.
I saw some algorithms in graphics which could assist the pilot and crazyflie for a more stable attitude, and I want to do a Wireless FPV system for my crazyflie.
So,what should I do first?
Are there any suggestion for my plan?
Looking foward to your replies.

Yixiong Xu

ASL means Above-Sea-Level and is computed based on the barometer pressure. There are not many details available, one start would be here http://wiki.bitcraze.se/projects:crazyf ... itude_hold and the forum (there are some old posts about it because the mode was developed by a user).

Drift: Do you experience an issue with the height or is the height stable but the flie drifts in x- or y- direction? It is possible to set the trim values permanently (across restarts) using the bootloader: http://wiki.bitcraze.se/projects:crazyf ... bootloader. Those values should be fairly constant as long as you make sure that you start the Crazyflie on a level surface (it does auto-calibration in the beginning).

There are some forum posts about FPV systems for the crazyflie, you can use the search and see if they are applicable in your case.

whoenig wrote:ASL means Above-Sea-Level and is computed based on the barometer pressure. There are not many details available, one start would be here http://wiki.bitcraze.se/projects:crazyf ... itude_hold and the forum (there are some old posts about it because the mode was developed by a user).

Drift: Do you experience an issue with the height or is the height stable but the flie drifts in x- or y- direction? It is possible to set the trim values permanently (across restarts) using the bootloader: http://wiki.bitcraze.se/projects:crazyf ... bootloader. Those values should be fairly constant as long as you make sure that you start the Crazyflie on a level surface (it does auto-calibration in the beginning).

There are some forum posts about FPV systems for the crazyflie, you can use the search and see if they are applicable in your case.

Thanks a lot.
Working on the FPV!~