53 lines
1.7 KiB
Markdown
Executable File
53 lines
1.7 KiB
Markdown
Executable File
# UART Write
|
|
|
|
### ~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](/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.
|
|
|
|
### ~
|
|
|
|
The [Bluetooth UART service](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.
|
|
|
|
With the Bluetooth UART service running, this block allows a micro:bit to send data to a Bluetooth connected device.
|
|
|
|
```sig
|
|
bluetooth.uartWrite("");
|
|
```
|
|
|
|
### Example: Starting the Bluetooth UART service and then sending "HELLO" whenever button A is pressed and another device has connected over Bluetooth
|
|
|
|
```blocks
|
|
let connected = 0;
|
|
bluetooth.onBluetoothConnected(() => {
|
|
basic.showString("C");
|
|
connected = 1;
|
|
});
|
|
bluetooth.onBluetoothDisconnected(() => {
|
|
basic.showString("D");
|
|
connected = 0;
|
|
});
|
|
bluetooth.startUartService();
|
|
input.onButtonPressed(Button.A, () => {
|
|
if (connected == 1) {
|
|
bluetooth.uartWrite("HELLO");
|
|
}
|
|
});
|
|
```
|
|
|
|
### Video - UART service guessing game
|
|
|
|
https://www.youtube.com/watch?v=PgGeWddMAZ0
|
|
|
|
### 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/)
|
|
|
|
### See also
|
|
|
|
[Bluetooth SIG](https://www.bluetooth.com), [Bluetooth on micro:bit resources](http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html)
|
|
|
|
```package
|
|
microbit-bluetooth
|
|
```
|