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15. Calibration of the Position Sensors
If the quadrocopter does not hover stably in place, but keeps flying in a particular direction, this can be fixed with the
trim. If the trim must be adjusted very far, you may need to recalibrate the position sensors in the model.
Proceed as follows:
Switch the transmitter on and then take the quadrocopter into operation.
In this case, place the quadrocopter ready to start onto a level, horizontally aligned surface.
The control lever for the pitch and yaw functions (9) must
be in the bottom-most position so that the motors are off.
Now move the control lever for the nod and roll functions
(4) to the bottom left corner and keep it there.
The two LEDs in the quadrocopter start to flash and then
remain lit permanently again.
Once the LEDs are permanently lit, return the control lever
for the nod and roll functions to the centre position. Cali-
bration of the position sensors is complete.
During calibration, the quadrocopter recognises
the current alignment (front/rear) and saves it.
Perform a test flight to check if the quadrocopter
still strongly tends to fly into a specific direction.
Very small trends can be compensated via the
trim.
Figure 20