43 lines
2.3 KiB
Markdown
Executable File
43 lines
2.3 KiB
Markdown
Executable File
# Bluetooth LED 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 @boardname@ has, it must first be [paired with the @boardname@](/reference/bluetooth/bluetooth-pairing). Once paired, the other device may connect to the @boardname@ and exchange data relating to many of the @boardname@'s features.
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### ~
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The Bluetooth LED service allows another device such as a smartphone to send short text strings or patterns over a Bluetooth connection to a @boardname@ for display on its LED matrix. Text will scroll across the @boardname@ and the speed at which it scrolls can also be controlled using the Bluetooth LED service. Devices using the LED service may also read the current state of the @boardname@'s LED matrix.
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So you could, for example, draw a smiley face in a smartphone app and at the press of a button, have it magically appear on your @boardname@ on the other side of the room. Or you could program your smartphone to send a message to your @boardname@ whenever your phone receives an email, SMS or social media message so you could wear your @boardname@ like a smart watch and leave your phone in your bag.
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No additional code is needed on the @boardname@ to use the Bluetooth LED service from another device.
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```sig
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bluetooth.startLEDService();
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```
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### Example: Starting the Bluetooth LED service
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The following code shows the Bluetooth LED service being started:
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```blocks
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bluetooth.startLEDService();
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```
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### Video - LED service demo starts at 2:00
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http://www.youtube.com/watch?v=aep_GVowKfs
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### Advanced
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For more advanced information on the @boardname@ Bluetooth LED service including information on using a smartphone, see the [Lancaster University @boardname@ runtime technical documentation](http://lancaster-university.github.io/microbit-docs/ble/led-service/)
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### See also
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[About Bluetooth](/reference/bluetooth/about-bluetooth), [@boardname@ Bluetooth profile overview ](http://lancaster-university.github.io/microbit-docs/ble/profile/), [@boardname@ Bluetooth profile reference](http://lancaster-university.github.io/microbit-docs/resources/bluetooth/microbit-profile-V1.9-Level-2.pdf), [Bluetooth on @boardname@ 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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