69 lines
1.6 KiB
Markdown
69 lines
1.6 KiB
Markdown
# Compass Heading
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Find which direction on a compass the micro:bit is facing.
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The micro:bit measures the **compass heading** from `0` to `360`
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degrees with its **magnetometer** chip. Different numbers mean north,
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east, south, and west.
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```sig
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input.compassHeading();
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```
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### Returns
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* a [number](/reference/types/number) from `0` to `360` degrees, which means the compass heading. If the compass isn't ready, it returns `-1003`.
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### Example
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This program finds the compass heading and stores it in the
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`degrees` variable.
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```blocks
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let degrees = input.compassHeading()
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```
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### ~hint
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When you run a program that uses this function in a browser, click and drag
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the compass needle on the screen to change the compass heading.
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### ~
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### Example: compass
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This program finds the compass heading and then shows a letter
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that means whether the micro:bit is facing north (N), south (S),
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east (E), or west (W).
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```blocks
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basic.forever(() => {
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let degrees = input.compassHeading()
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if (degrees < 45)
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basic.showString("N")
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else if (degrees < 135)
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basic.showString("E")
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else if (degrees < 225)
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basic.showString("S")
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else basic.showString("W")
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})
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```
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### Calibration
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Every time you start to use the compass (for example, if you have just
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turned the micro:bit on), the micro:bit will start to **calibrate**
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(adjust itself). It will ask you to draw a circle by tilting the
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micro:bit.
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If you are calibrating or using the compass near metal, it might
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confuse the micro:bit.
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### Lessons
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[compass](/lessons/compass)
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### See also
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[acceleration](/reference/input/acceleration)
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