29 lines
1.5 KiB
Markdown
29 lines
1.5 KiB
Markdown
# UART Write Number
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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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The [Bluetooth UART service](/reference/bluetooth/start-uart-service.md) allows another device such as a smartphone to exchange any data it wants to with the micro:bit, in small chunks.
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With the Bluetooth UART service running, this block allows a micro:bit to send data to a Bluetooth connected device.
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```sig
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bluetooth.uartWriteNumber(42);
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```
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### Advanced
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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
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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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```
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