#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

#define LED 13
#define PAD1 A2
#define PAD2 A3
#define PAD3 A4
#define PAD4 A5

int threshold = 50;
byte note1 = 28;
byte note2 = 29;
byte note3 = 30;
byte note4 = 31;

int pad1hit = 0;
int pad2hit = 0;
int pad3hit = 0;
int pad4hit = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  MIDI.begin(4);
  pinMode(LED, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (analogRead(PAD1) >= threshold) {
    pad1hit = 1;
    //Serial.print("max = ");
   //Serial.print(analogRead(PAD1));
  }
  if (pad1hit == 1 && analogRead(PAD1) <= (threshold - 10)){
    int volume1 = analogRead(PAD1);
    digitalWrite(LED, HIGH);
    //Serial.print("Volume1 =");
   //Serial.print(analogRead(PAD1));
    MIDI.sendNoteOn(note1, volume1, 1);
    MIDI.sendNoteOff(note1, 0, 1);
    volume1=0;
    pad1hit = 0;
  }
  digitalWrite(LED, LOW);

  
  if (analogRead(PAD2) >= threshold) {
    pad2hit = 1;
    //Serial.print("max = ");
   //Serial.print(analogRead(PAD1));
  }
  if (pad2hit == 1 && analogRead(PAD2) <= (threshold - 10)){
    int volume2 = analogRead(PAD2);
    digitalWrite(LED, HIGH);
    //Serial.print("Volume1 =");
   //Serial.print(analogRead(PAD1));
    MIDI.sendNoteOn(note2, volume2, 1);
    MIDI.sendNoteOff(note2, 0, 1);
    volume2=0;
    pad2hit = 0;
  }
  digitalWrite(LED, LOW);


  if (analogRead(PAD3) >= threshold) {
    pad3hit = 1;
    //Serial.print("max = ");
   //Serial.print(analogRead(PAD1));
  }
  if (pad3hit == 1 && analogRead(PAD3) <= (threshold - 10)){
    int volume3 = analogRead(PAD3);
    digitalWrite(LED, HIGH);
    //Serial.print("Volume1 =");
   //Serial.print(analogRead(PAD1));
    MIDI.sendNoteOn(note3, volume3, 1);
    MIDI.sendNoteOff(note3, 0, 1);
    volume3=0;
    pad3hit = 0;
  }
  digitalWrite(LED, LOW);


  if (analogRead(PAD4) >= threshold) {
    pad4hit = 1;
    //Serial.print("max = ");
   //Serial.print(analogRead(PAD1));
  }
  if (pad4hit == 1 && analogRead(PAD4) <= (threshold - 10)){
    int volume4 = analogRead(PAD4);
    digitalWrite(LED, HIGH);
    //Serial.print("Volume1 =");
   //Serial.print(analogRead(PAD1));
    MIDI.sendNoteOn(note4, volume4, 1);
    MIDI.sendNoteOff(note4, 0, 1);
    volume4=0;
    pad4hit = 0;
  }
  digitalWrite(LED, LOW);
}