arduino micro midi clock with pot

ard-midi-clock-pot.ino

#define MIDI_CLOCK 0xF8

#define MIDI_CLOCK_PIN 1

// Define the MIDI baud rate
#define MIDI_BAUD_RATE 31250

unsigned long previousMicros = 0;
unsigned long intervalBetweenTempoChanges = 2000;  // 2 seconds in microseconds
unsigned long lastTempoChangeTime = 0;
unsigned long MICROSECONDS_PER_CLOCK = 30000;
unsigned long mils = 0;

const int potentiometerPin = A0;
int previousPotValue = 0;

void setup() {
  pinMode(MIDI_CLOCK_PIN, OUTPUT);
  Serial.begin(MIDI_BAUD_RATE);
  Serial1.begin(MIDI_BAUD_RATE);
}

void loop() {

  // Get the current time in microseconds
  unsigned long currentMicros = micros();

  // Check if the specified interval has passed
  if (currentMicros - previousMicros >= MICROSECONDS_PER_CLOCK) {
    int potValue = analogRead(potentiometerPin);
    if (potValue != previousPotValue) {
      changeTempo(potValue);
      previousPotValue = potValue;
    }

    // Send MIDI clock message at the specified interval
    sendMidiClock();
    previousMicros = currentMicros;
  }
}

void changeTempo(int val) {

      // Update the previous potentiometer value
      MICROSECONDS_PER_CLOCK = scaleValue(val, 0, 1023, 45000, 6000);
      Serial.print("Potentiometer Value: ");
      Serial.println(val);
      Serial.println(MICROSECONDS_PER_CLOCK);

}

unsigned long scaleValue(unsigned long inputValue, unsigned long fromLow, unsigned long fromHigh, unsigned long toLow, long unsigned toHigh) {
  // Ensure the input value is within the input range
  inputValue = constrain(inputValue, fromLow, fromHigh);

  Serial.println("constrainted:");
  Serial.println(inputValue);

  // Map the input value from the input range to the output range
  long scaledValue = map(inputValue, fromLow, fromHigh, toLow, toHigh);

  return scaledValue;
}

void sendMidiClock() {
    // Send the MIDI clock message on the default Serial TX pin (pin 1)
    Serial1.write(MIDI_CLOCK);
}

void randomizeTempo() {
  MICROSECONDS_PER_CLOCK = random(7000, 50000);  // Adjust the range as needed
}