Core2 (vs original Core) on IoT Base CatM config appears to be that pins 13/14 are used for UART (vs 17/18) hence:
Groove cable (M5Stack spec) W|Y|R|B = 13(R)|14(T)|VCC|GND
Connected to micro:bit W|Y|R|B = 15(T)|16(R)|VCC|GND

NB I am using Keyestudio shield/carrier board to match power to 5V and control to 3V3. Minor mods to the code above with a little pause for effect and it's working to flash LEDs [0, 0], [2, 2] and [4, 4] and send back text strings from buttons A and B to label.

@ajb2k3 Youre welcome.. I just saw the loop at the end was gone tho.. should be an (empty) loop under the red block..
ok, thanks for letting me know

Now I need to find my bits to play with this and explore.

Thank you my friend for this.

Simple test/demo to show how to communicate with the Micro-bit.

link text

The Micro-bit program ;;

As javascript ;

• let numb = 0
• let inp = ""
• serial.redirect(
• SerialPin.P8,
• SerialPin.P12,
• BaudRate.BaudRate115200
• )
• serial.writeLine("")
• serial.writeLine("")
• serial.writeLine("Hello from Micro Bit")
• serial.writeLine("")
• serial.writeLine("")
• basic.forever(function () {

• inp = serial.readString()
  

• numb = parseFloat(inp)
  

• if (numb == 1) {
  

•     basic.showString("A")
  

• }
  

• if (numb == 2) {
  

•     basic.showString("B")
  

• }
  

• if (numb == 3) {
  

•     basic.showString("C")
  

• }
  

• })

And the M5stack code (arduino)

• #include <M5Stack.h>
• #include <M5StackUpdater.h>
• // The setup() function runs once each time the micro-controller starts
• void setup() {
• M5.begin();
• Wire.begin();
• // If using Lovyan launcher
• if(digitalRead(BUTTON_A_PIN) == 0){

• Serial.println("Will load menu binary");
  

• updateFromFS(SD);
  

• ESP.restart();
  

• }
• Serial2.begin(115200, SERIAL_8N1, 16, 17);
• M5.Lcd.clear(BLACK);
• M5.Lcd.setTextColor(YELLOW);
• M5.Lcd.setTextSize(2);
• M5.Lcd.setCursor(0, 10);
• M5.Lcd.println("Button Micro-Bit example");
• M5.Lcd.println();
• }
• // Add the main program code into the continuous loop() function
• void loop() {
• // update button state
• M5.update();
• if(Serial2.available()) {
• char ch = Serial2.read();
• if ( (ch >+ 'A') && (ch +'z') )M5.Lcd.write(ch);
• }
• if (M5.BtnA.wasReleased()) {

• Serial2.write('1');
  

• } else if (M5.BtnB.wasReleased()) {

• Serial2.write('2');
  

• } else if (M5.BtnC.wasReleased()) {

• Serial2.write('3');
  

• }
• }

If you have a Micro-bit I suppose you know how to put the code in (I use makecode (offline) online version schould work the same..

and then use the arduino to program the M5stack....
Then press button A on the M5 and the Micro-bit shows a A..
Same with button B and C...

Just for fun and to show how to communicate with the micro-bit..

Nice, could you achieve the same thing in UIFLOW using the Blocky environment?