barometer activate/deactivate?

[d0nar]

Hi,

i will try to build a Quadro multiwii but i´m still confused about the Barometer.

Is the Barometer activated the whole time or can i deactivate it through the lcd or via a command like for activate the lcd config?
can i limit the elevation through the lcd (for example: limit max. height to 20 meters and the min. height to 1 meter)?

Regards,
d0nar

[UndCon]

The barometer is for altitude hold.

You activate it by a switch on your radio when you fly at desired altitude.
The software tries to maintain this altitude during this action.
I have a BMP085 lying on my desk but it is not connected yet.

[ripcurl0-0]

how does it control the altitude by software ? does it take readings then control throttle?

[Alexinparis]

It's explained somewhere in the change.txt file

[BlazeX]

Let me explain:
The Barometer measures pressure and temperature. From these data you can compute the altitude in the atmosphere.
If you activate the "Hold Altitude Function" the software is checking the altitude a lot of times per second. If there is a change e.g. increasing height, the motor power is regulated down to decrease altitude. In the end the Quadro has a fixed altitude.