midi-blink.ino

// for Pro Micro
#include "MIDIUSB.h"

void setup() {
  pinMode(11,OUTPUT);
}

void loop() {
  midiEventPacket_t rx;
  do {
    rx = MidiUSB.read();
    if (rx.header != 0) {
      if(((rx.byte1) & 0xF0) == 0x90){ // Note On
        if(rx.byte3 != 0){ // Note On
          digitalWrite(11,HIGH);
        }else{ // Note OFF
          digitalWrite(11,LOW);
        }
      }else if(((rx.byte1) & 0xF0) == 0x80){ // Note OFF
        digitalWrite(11,LOW);
      }
    }
  } while (rx.header != 0);
}