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#include <MIDI.h>


#define Heart 2                            //Attach the Grove Ear-clip sensor to digital pin 2.
#define LED 4                              //Attach an LED to digital pin 4

boolean beat = false;                      /* This "beat" variable is used to control the timing of the Serial communication
                                           so that data is only sent when there is a "change" in digital readings. */

//MIDI_CREATE_DEFAULT_INSTANCE();

 int velocity = 50;//velocity of MIDI notes, must be between 0 and 127
 //higher velocity usually makes MIDI instruments louder
 
 int noteON = 144;//144 = 10010000 in binary, note on command
 //int noteOFF = 128;//128 = 10000000 in binary, note off command                                        

//==SETUP==========================================================================================
void setup() {
 //MIDI.begin(MIDI_CHANNEL_OMNI);
  Serial.begin(115200);                     //Initialise serial communication
  pinMode(Heart, INPUT);                  //Set digital pin 2 (heart rate sensor pin) as an INPUT
  pinMode(LED, OUTPUT);                   //Set digital pin 4 (LED) to an OUTPUT
}


//==LOOP============================================================================================
void loop() {
  if (digitalRead(Heart) > 0) {           //The heart rate sensor will trigger HIGH when there is a heart beat
    if (!beat) {                          //Only send data when it first discovers a heart beat - otherwise it will send a high value multiple times
      beat = true;                        //By changing the beat variable to true, it stops further transmissions of the high signal
      digitalWrite(LED, HIGH);
      int note=60;
      MIDImessage(noteON, note, velocity);//turn note on
    delay(300);//hold note for 300ms
    
      
      //Serial.println(1023);               //Send the high value to the computer via Serial communication.
    }
  } else {                                //If the reading is LOW,
    if (beat) {                           //and if this has just changed from HIGH to LOW (first low reading)
      beat = false;                       //change the beat variable to false (to stop multiple transmissions)
      digitalWrite(LED, LOW); 
      int note=60;
      MIDImessage(noteON, note, 0);//turn note off
    delay(300);//wait 200ms until triggering next note

      //Serial.println(0);                  //then send a low value to the computer via Serial communication.
    }
  }
}
void MIDImessage(int command, int MIDInote, int MIDIvelocity) {
  Serial.write(command);//send note on or note off command 
  Serial.write(MIDInote);//send pitch data
  Serial.write(MIDIvelocity);//send velocity data
}