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pxt-calliope/docs/reference/bluetooth/uart-write-number.md
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UART Write Number

~hint

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. Once paired, the other device may connect to the micro:bit and exchange data relating to many of the micro:bit's features.

~

The Bluetooth UART service allows another device such as a smartphone to exchange any data it wants to with the micro:bit, in small chunks.

With the Bluetooth UART service running, this block allows a micro:bit to send data to a Bluetooth connected device.

bluetooth.uartWriteNumber(42);

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

See also

About Bluetooth, micro:bit Bluetooth profile overview , micro:bit Bluetooth profile reference, Bluetooth on micro:bit resources, Bluetooth SIG

bluetooth