midi_test.ino

//midi test

void setup() {

   // Initialise Serial connection
    Serial.begin(115200);
    
    //midi
    //nodemcu use pin D4 for TX
    Serial1.begin(31250);
}

int note[] = { 0x3C,0x3E,0x40,0x41,0x43,0x45,0x47,
               0x48,0x4A,0x4C,0x4D,0x4F,0x51,0x53,0x55};

void loop() {
  for (int i=0;i<8;i++) {
   Serial.println(i,DEC);
    midiSend(0x90, note[i],0x60);
    delay(100);
    midiSend(0x80, note[i],0x00);
    delay(100);
  }
  Serial.println();
}


void midiSend(int cmd, int pitch, int velocity) {
//  int note2[] = { 0x23,0x26,0x34,0x32,0x2F,0x2B,0x34};
//  int note[] = { 0x3C,0x3E,0x40,0x41,0x43,0x45,0x47,
//                0x48,0x4A,0x4C,0x4D,0x4F,0x51,0x53,0x55};
                
     Serial1.write(cmd);
     Serial1.write(pitch);
     Serial1.write(velocity);
}