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updated bluetooth docs

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Peli de Halleux
2016-06-22 09:25:01 -07:00
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docs/reference/bluetooth/start-magnetometer-service.md
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# Bluetooth Magnetometer Service
### ~hint
![](/static/bluetooth/Bluetooth_SIG.png)
For another device like a smartphone to use any of the Bluetooth "services" which the micro:bit has, it must first connect to the micro:bit.
### ~
The Bluetooth magnetometer service allows another device such as a smartphone to wirelessly receive data from the micro:bit's magnetometer. The magnetometer measures the strength and direction of magnetic fields including the earth's and so it can be used as a digital compass and indicate the way the micro:bit is pointing relative to magnetic north.
Using the Bluetooth magnetometer service you could, for example, create a smartphone application which displays your direction of travel, updating it in real time.
No additional code is needed on the micro:bit to use the Bluetooth magnetometer service from another device.
~~~~sig
```sig
bluetooth.startMagnetometerService();
~~~~
```
### Example: Starting the Bluetooth magnetometer service
The following code shows the Bluetooth magnetometer service being started:
~~~~blocks
```blocks
bluetooth.startMagnetometerService();
~~~~
```
### Video - Magnetometer service demo
[![micro:bit Bluetooth demo video](/static/bluetooth/microbit_magnetometer.png)](
http://www.youtube.com/watch?v=C_0VL4Gp4_U "Click to launch YouTube video"
)
http://www.youtube.com/watch?v=C_0VL4Gp4_U
### Advanced
@ -32,7 +35,9 @@ For more advanced information on the micro:bit Bluetooth magnetometer service in
### See also
[Bluetooth SIG](https://www.bluetooth.com)
[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
[Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
```package
microbit-bluetooth
```