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Peli de Halleux 2016-06-21 09:17:46 -07:00
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docs/reference/bluetooth/on-bluetooth-connected.md
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# On Bluetooth Connected
### ~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. This block starts an [event handler](/reference/event-handler) which in this case will run when something connects to your micro:bit using Bluetooth.
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.
### ~
This block starts an [event handler](/reference/event-handler) which in this case will run
when something connects to your micro:bit using Bluetooth.
```sig
bluetooth.onBluetoothConnected(() => {});
```
### Example
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.
~~~~sig
bluetooth.onBluetoothConnected(() => {
});
~~~~
### Example: Displaying "C" when another device connects to the micro:bit over Bluetooth
~~~~blocks
```blocks
bluetooth.onBluetoothConnected(() => {
basic.showString("C");
});
~~~~
```
### Video - on Bluetooth connected
[![micro:bit Bluetooth demo video](/static/bluetooth/microbit_on_connected.png)](
http://www.youtube.com/watch?v=HyBcsD9Eh6I "Click to launch YouTube video"
)
http://www.youtube.com/watch?v=HyBcsD9Eh6I
### See also
[Bluetooth SIG](https://www.bluetooth.com)
[Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
```package
microbit-bluetooth
```