pxt-calliope/docs/reference/bluetooth.md

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# Bluetooth
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Support for additional Bluetooth services.
### ~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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```cards
bluetooth.startAccelerometerService();
bluetooth.startButtonService();
bluetooth.startIOPinService();
bluetooth.startLEDService();
bluetooth.startMagnetometerService();
bluetooth.startTemperatureService();
bluetooth.onBluetoothConnected(() => {});
bluetooth.onBluetoothDisconnected(() => {});
```
## UART
```cards
bluetooth.startUartService();
bluetooth.uartReadUntil("");
bluetooth.uartWriteString("");
bluetooth.uartWriteNumber(0);
bluetooth.uartWriteValue("", 0);
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```
```package
bluetooth
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```
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### Advanced
For more advanced information on the micro:bit Bluetooth UART service including information on using a smartphone, see the [Lancaster University micro:bit runtime technical documentation](http://lancaster-university.github.io/microbit-docs/ble/uart-service/)
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### See Also
[startAccelerometerService](/reference/bluetooth/start-accelerometer-service), [startButtonService](/reference/bluetooth/start-button-service), [startIOPinService](/reference/bluetooth/start-io-pin-service), [startLEDService](/reference/bluetooth/start-led-service), [startMagnetometerService](/reference/bluetooth/start-magnetometer-service), [startTemperatureService](/reference/bluetooth/start-temperature-service),
[startUartService](/reference/bluetooth/start-uart-service),
[uartReadUntil](/reference/bluetooth/uart-read-until),
[uartWriteString](/reference/bluetooth/uart-write-string),
[uartWriteNumber](/reference/bluetooth/uart-write-number),
[uartWriteValue](/reference/bluetooth/uart-write-value),
[onBluetoothConnected](/reference/bluetooth/on-bluetooth-connected), [onBluetoothDisconnected](/reference/bluetooth/on-bluetooth-disconnected)