65 lines
1.5 KiB
Markdown
65 lines
1.5 KiB
Markdown
# 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.
|
|
|
|
```sig
|
|
input.compassHeading();
|
|
```
|
|
|
|
### Returns
|
|
|
|
* a [number](/reference/types/number) from `0` to `360` degrees, which means the compass heading. If the compass isn't ready, it returns `-1003`.
|
|
|
|
### Example
|
|
|
|
This program finds the compass heading and stores it in the
|
|
`degrees` variable.
|
|
|
|
```blocks
|
|
let degrees = input.compassHeading()
|
|
```
|
|
|
|
### ~hint
|
|
|
|
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).
|
|
|
|
```blocks
|
|
basic.forever(() => {
|
|
let degrees = input.compassHeading()
|
|
if (degrees < 45)
|
|
basic.showString("N")
|
|
else if (degrees < 135)
|
|
basic.showString("E")
|
|
else if (degrees < 225)
|
|
basic.showString("S")
|
|
else basic.showString("W")
|
|
})
|
|
```
|
|
|
|
### Calibration
|
|
|
|
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 **calibrate**
|
|
(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.
|
|
|
|
### See also
|
|
|
|
[acceleration](/reference/input/acceleration)
|