pxt-calliope/docs/reference/bluetooth/on-bluetooth-connected.md

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# On Bluetooth Connected
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### ~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 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
when something connects to your micro:bit using Bluetooth.
```sig
bluetooth.onBluetoothConnected(() => {});
```
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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.
```blocks
bluetooth.onBluetoothConnected(() => {
basic.showString("C");
});
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```
### Video - on Bluetooth connected
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http://www.youtube.com/watch?v=HyBcsD9Eh6I
### See also
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[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
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```package
microbit-bluetooth
```