pxt-calliope/docs/lessons/compass/activity.md
Michael Elliot Braun ba6c9f9d92 updating lesson links
2016-03-30 16:10:27 -07:00

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# compass activity
Display the direction that the micro:bit is facing using the compass
### ~avatar avatar
Welcome! This guided tutorial will show you how to program a script that displays the direction the micro:bit is pointing. Let's get started!
### ~
Create a loop that will continuously update the reading of the compass.
```blocks
basic.forever(() => {
})
```
Store the reading of the micro:bit in a variable called `degrees`.
```blocks
basic.forever(() => {
let degrees = input.compassHeading()
})
```
If `degrees` is less than `45`, then the compass heading is mostly pointing toward North. Display `N` on the micro:bit.
```blocks
let degrees = 0;
basic.forever(() => {
degrees = input.compassHeading();
if (degrees < 45) {
basic.showString("N");
}
});
```
If `degrees` is less than 135, the micro:bit is mostly pointing East. Display `E` on the micro:bit.
```blocks
let degrees = 0;
basic.forever(() => {
degrees = input.compassHeading();
if (degrees < 45) {
basic.showString("N");
}
else if (degrees < 135) {
basic.showString("E");
}
});
```
If `degrees` is less than 225, the micro:bit is mostly pointing South. Display `S` on the micro:bit.
```blocks
let degrees = 0;
basic.forever(() => {
degrees = input.compassHeading();
if (degrees < 45) {
basic.showString("N");
}
else if (degrees < 135) {
basic.showString("E");
}
else if (degrees < 225) {
basic.showString("S");
}
});
```
If none of these conditions returned true, then the micro:bit must be pointing West. Display `W` on the micro:bit.
```blocks
let degrees = 0;
basic.forever(() => {
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");
}
});
```
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/microbit/lessons/compass/challenges)!
### ~