44 lines
1.8 KiB
Markdown
Executable File
44 lines
1.8 KiB
Markdown
Executable File
# Bluetooth Magnetometer Service
|
|
|
|
### ~hint
|
|
|
|
|
|
For another device like a smartphone to use any of the Bluetooth "services" which the micro:bit has, it must first be [paired with the micro:bit](/reference/bluetooth/bluetooth-pairing). Once paired, the other device may connect to the micro:bit and exchange data relating to many of the micro:bit's features.
|
|
|
|
### ~
|
|
|
|
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
|
|
bluetooth.startMagnetometerService();
|
|
```
|
|
|
|
### Example: Starting the Bluetooth magnetometer service
|
|
|
|
The following code shows the Bluetooth magnetometer service being started:
|
|
|
|
```blocks
|
|
bluetooth.startMagnetometerService();
|
|
```
|
|
|
|
### Video - Magnetometer service demo
|
|
|
|
http://www.youtube.com/watch?v=C_0VL4Gp4_U
|
|
|
|
### Advanced
|
|
|
|
For more advanced information on the micro:bit Bluetooth magnetometer service including information on using a smartphone, see the [Lancaster University micro:bit runtime technical documentation](http://lancaster-university.github.io/microbit-docs/ble/magnetometer-service/)
|
|
|
|
### See also
|
|
|
|
[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
|
|
|
|
|
|
```package
|
|
microbit-bluetooth
|
|
```
|