54 lines
1.9 KiB
Markdown
54 lines
1.9 KiB
Markdown
|
# UART Read
|
||
|
|
||
|
### ~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 connect to the micro:bit.
|
||
|
|
||
|
### ~
|
||
|
|
||
|
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 read data which has been received from a Bluetooth connected device, terminating reading and returning the value obtained as soon as a specified delimiter character is encountered. This means that connected devices can send data to the micro:bit and indicate that the complete message has been sent by appending the message with the delimiter character.
|
||
|
|
||
|
```sig
|
||
|
bluetooth.uartRead("");
|
||
|
```
|
||
|
|
||
|
### Example: Starting the Bluetooth UART service and then reading data received from another device which is terminated by ":" character and then displaying it
|
||
|
|
||
|
```blocks
|
||
|
let uart_data: string = "";
|
||
|
let connected = 0;
|
||
|
basic.showString("UART");
|
||
|
bluetooth.startUartService();
|
||
|
bluetooth.onBluetoothConnected(() => {
|
||
|
basic.showString("C");
|
||
|
connected = 1;
|
||
|
while (connected == 1) {
|
||
|
uart_data = bluetooth.uartRead(":");
|
||
|
basic.showString(uart_data);
|
||
|
}
|
||
|
});
|
||
|
bluetooth.onBluetoothDisconnected(() => {
|
||
|
basic.showString("D");
|
||
|
});
|
||
|
|
||
|
```
|
||
|
|
||
|
### 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
|
||
|
```
|