1.9 KiB
Executable File
UART Read
~hint
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 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.
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
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
See also
Bluetooth SIG, Bluetooth on micro:bit resources
microbit-bluetooth