9. Make a compass
This module gives you access to the built-in electronic compass (mpu). The compass should be calibrated before use, otherwise the reading may be wrong.
note:The alignment compass causes the program to pause until the alignment is complete. Calibration consists of a small game, by rotating the board in the air to complete the circle calibration.
Function of compass
- Perform this function to start the calibration process, you will receive a has a guiding significance to the information, then we need to rotate the board and in the air to draw a handstand '8' or circle, (this movement can refer to your mobile phone, mobile phone function of compass will have a calibration steps before use), the calibration process will take about 1 minute of time, you can't perform other procedures during calibration
- Notice message