37 lines
1.7 KiB
Markdown
Executable File
37 lines
1.7 KiB
Markdown
Executable File
# On Bluetooth Connected
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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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This block starts an [event handler](/reference/event-handler) which in this case will run
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when something connects to your micro:bit using Bluetooth.
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```sig
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bluetooth.onBluetoothConnected(() => {});
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```
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### Example
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You could use this event handler to display a letter "C" on the micro:bit LED grid so you know you have a Bluetooth connection. Or you might want to send some data you've been accumulating to your smartphone as soon as it connects to your micro:bit. Maybe you've been using the accelerometer in your micro:bit to count your steps for example. Using this event handler you could send the accumulated step count to your phone when it establishes a Bluetooth connection.
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```blocks
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bluetooth.onBluetoothConnected(() => {
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basic.showString("C");
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});
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```
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### Video - on Bluetooth connected
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http://www.youtube.com/watch?v=HyBcsD9Eh6I
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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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``` |