Difference between revisions of "9. Make a compass"
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=compass= | =compass= | ||
Latest revision as of 02:39, 21 February 2019
Overview: BPI-Bit
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
- compass.calibrate()
- 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
- compass.is_calibrated ()
- Returns True if compass calibration is successful, or False otherwise
- compass.get_x ()
- Returns a reading of the strength of the magnetic field on the X-axis, which is a positive or negative integer, depending on the direction of the magnetic field.
- compass.get_y ()
- Returns a reading of the magnetic field intensity on the Y-axis, which is a positive or negative integer, depending on the direction of the magnetic field.
- compass.get_z ()
- Returns a reading of the z-axis magnetic field intensity, which is a positive or negative integer, depending on the direction of the magnetic field
- compass.heading()
- The compass heading calculated from the above readings is an integer between 0 and 360, representing a clockwise Angle of 0 at 12 o 'clock
- compass.get_field_strength()
- Returns the size of the magnetic field around the device, which is an integer.
sample code
""" compass.py Creates a compass. The user will need to calibrate the compass first. The compass uses the built-in clock images to display the position of the needle. """ from microbit import * # Start calibrating compass.calibrate() # Try to keep the needle pointed in (roughly) the correct direction while True: sleep(100) needle = ((15 - compass.heading()) // 30) % 12 display.show(Image.ALL_CLOCKS[needle])
In this sample code the first step is to calibrate the electronic compass (mpu). After the calibration, we can see that we have a compass on the led panel. No matter how we turn the board, it always points to the south. Right
