// Set pin number for kick drum
const int kickPin = 2;

// Set pin number for tempo potentiometer
const int tempoPotPin = A0;

// Set number of beats per measure
const int beatsPerMeasure = 16;

// Set time signature (beats per measure, note value)
const int timeSignature[2] = {beatsPerMeasure, 16};

// Set pattern of beats for one measure (0 = rest, 1 = kick drum)
const int beatPattern[] = {1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1};

// Set current beat and measure
int currentBeat = 0;
int currentMeasure = 0;

void setup() {
  // Set kick drum pin as output
  pinMode(kickPin, OUTPUT);

  // Set tempo potentiometer pin as input
  pinMode(tempoPotPin, INPUT);
}

void loop() {
  // Read tempo from potentiometer and calculate beat duration
  int tempoPotValue = analogRead(tempoPotPin);
  int tempo = map(tempoPotValue, 0, 1023, 60, 200);
  int beatDuration = 30000 / tempo;

  // Check if it's time to play the next beat
  if (millis() % beatDuration == 0) {
    // Play the kick drum if the beat pattern is 1
    if (beatPattern[currentBeat] == 1) {
      digitalWrite(kickPin, HIGH);
      delay(50);
      digitalWrite(kickPin, LOW);
    }
    // Move to the next beat
    currentBeat++;
    if (currentBeat >= timeSignature[0]) {
      currentBeat = 0;
      currentMeasure++;
      if (currentMeasure >= 16) { // change here to change the number of measures per loop
        currentMeasure = 0;
      }
    }
  }
  // Delay a short amount of time to prevent overwhelming the loop
  delay(1);
}