View Single Post
Old Sep 21, 2012, 08:26 AM
e_lm_70 is offline
Find More Posts by e_lm_70
Registered User
Joined Jan 2004
8,812 Posts
Originally Posted by ThePara View Post
Altitude Hold: Once you have the copter hovering at a certain altitude, engaging AH will make it try to hold it regardless of the way it flies, without you having to correct from throttle. Barometer needs to be protected from sun, wind and prop-wash by a layer of foam, and the FC must not be in an airtight box.

Level: As opposed to Acro or 3D flight, once you let the sticks go, the copter will return to horizontal.

Heading hold: Once engaged, the flight forward will be on that axis, even if your copter front yaws left or right. Magnetic fields generated by motors, escs and power harness influences this alot.

Position Hold: keeps the copter from flying away using the GPS coordinates from the moment you activate the function and stop using TX controls. Coupled with Altitude Hold will keep the copter at a fixed point in space.

RTH: returns the copter to the coordinates at which the GPS unit was powered on and aquired 3D Lock.

Keep in mind that TX commands override most of the functions. Throttle commands will take precedence over AH. PH should be oblivious to yaw input, but pitching and rolling will break the hold. So on, so forth.

Plus, there's alot of fine-tuning of PID variables to make all the functions work as intended,
Airtight make no sense .. and it is also almost impossible to achieve

If you put a rigid 100% airtight ... around the bar sensor ... then this sensor will always sense the same pressure independent by the real altitude


e_lm_70 is offline Find More Posts by e_lm_70
Reply With Quote