Compass Heading

Find which direction on a compass the micro:bit is facing.

The micro:bit measures the compass heading from 0 to 360 degrees with its magnetometer chip. Different numbers mean north, east, south, and west.



  • a number from 0 to 360 degrees, which means the compass heading. If the compass isn’t ready, it returns -1003.


This program finds the compass heading and stores it in the degrees variable.

let degrees = input.compassHeading()

When you run a program that uses this function in a browser, click and drag the compass needle on the screen to change the compass heading.

Example: compass

This program finds the compass heading and then shows a letter that means whether the micro:bit is facing north (N), south (S), east (E), or west (W).

let degrees = 0
basic.forever(() => {
    degrees = input.compassHeading()
    if (degrees < 45) {
    } else if (degrees < 135) {
    } else if (degrees < 225) {
    } else if (degrees < 315) {
    } else {


Every time you start to use the compass (for example, if you have just turned the micro:bit on), the micro:bit will start to calibrateCompass (adjust itself). It will ask you to draw a circle by tilting the micro:bit.

If you are calibrating or using the compass near metal, it might confuse the micro:bit.

Keep the calibration handy by running it when the user pressed A+B.

input.onButtonPressed(Button.AB, () => {

See also

acceleration, calibrateCompass