Digital Compass Calibration
Why calibrate the compass?
Ferromagnetic substances placed on the multi rotor or around its working environment will affect the reading of magnetic earth for the digital compass, it also reduces the accuracy of the multi rotor control, or even reads an incorrect heading. Calibration will eliminate such influences, and ensure the MC system performs well in a non-ideal magnetic environment.
When to do it?
The first time you install WKM on your multi rotor.
When the multi rotor mechanical setup is changed:
a) If the GPS/Compass module is re-positioned.
b) If electronic devices are added/removed/ re-positioned (Main Controller, servos, batteries, etc). c) When the mechanical structure of the multi rotor is changed.
If the flight direction appears to be shifting (meaning the multi rotor doesn’t "fly straight").
The LED indicator often indicates abnormality blinking when the multi rotor yaws. (It is normal for this to happen occasionally.)
Note:
Don’t calibrate your compass where there is strong magnetic interference, such as magnetite, car
park, and steel reinforcement under the ground.
DO NOT carry ferromagnetic materials with you during calibration, such as keys or cell phones.
You don’t need to rotate your multi rotor on a precise horizontal or vertical surface, but keep at least
45°difference between horizontal and vertical calibration.
The MC cannot work in the polar circle.
Calibration procedure
STEP1:
Enter calibration mode: quickly switch the control mode switch from Manual Mode to GPS Atti.
Mode
for 6 to 10 times, The LED indicator will turn on constantly blue;
STEP2:
Calibration in horizontal: rotate your multi rotor along the horizontal axis until the LED changes
to constant green, then go to the next step;
STEP3:
Calibration in vertical: while the LED is green, hold your multi rotor vertically and rotate it along
with its vertical axis, keep rotating until the LED turns off, meaning the calibration is finished.
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STEP4:
After you finished the calibration, The LED indicator will show whether the calibration was
successful or not:
If the LED turns on white for 3 seconds, then the calibration was successful, calibration mode
will exit automatically.
If the LED quickly flashes red, the calibration has failed. Switch the control mode switch one
time to cancel the current calibration, and then re-start from step 1 for re-calibration.
Tips:
If you keep having calibration failure, it might suggest that there is very strong magnetic interference
around the GPS & Compass module, please avoid flying in this area.
otherwise you spend hours trying to solve a problem that was infact in the first page of the manual... There is an answer and I hope you reach it, with any luck it will be something that has been overlooked.