44 lines
2.1 KiB
Markdown
Executable File
44 lines
2.1 KiB
Markdown
Executable File
# Bluetooth Magnetometer Service
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### ~hint
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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.
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### ~
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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.
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Using the Bluetooth magnetometer service you could, for example, create a smartphone application which displays your direction of travel, updating it in real time.
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No additional code is needed on the micro:bit to use the Bluetooth magnetometer service from another device.
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```sig
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bluetooth.startMagnetometerService();
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```
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### Example: Starting the Bluetooth magnetometer service
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The following code shows the Bluetooth magnetometer service being started:
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```blocks
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bluetooth.startMagnetometerService();
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```
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### Video - Magnetometer service demo
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http://www.youtube.com/watch?v=C_0VL4Gp4_U
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### Advanced
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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/)
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### See also
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[About Bluetooth](/reference/bluetooth/about-bluetooth), [micro:bit Bluetooth profile overview ](http://lancaster-university.github.io/microbit-docs/ble/profile/), [micro:bit Bluetooth profile reference](http://lancaster-university.github.io/microbit-docs/resources/bluetooth/microbit-profile-V1.9-Level-2.pdf), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html), [Bluetooth SIG](https://www.bluetooth.com)
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```package
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bluetooth
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```
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