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const int outputPin = 9; // Digital pin for the square wave output
volatile unsigned long frequency = 10000; // Initial frequency in Hz
const unsigned long minFrequency = 1000; // Minimum allowed frequency in Hz
const unsigned long maxFrequency = 20000; // Maximum allowed frequency in Hz
const int leftButtonPin = 2; // Digital pin for the left button
const int rightButtonPin = 3; // Digital pin for the right button

void setup() {
  pinMode(outputPin, OUTPUT);
  pinMode(leftButtonPin, INPUT_PULLUP);
  pinMode(rightButtonPin, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(leftButtonPin), increaseFrequency, FALLING);
  attachInterrupt(digitalPinToInterrupt(rightButtonPin), decreaseFrequency, FALLING);

  Serial.begin(9600);
  updateFrequency();
}

void loop() {
  // No code needed here
}

void updateFrequency() {
  // Calculate the duration based on the desired frequency to maintain consistent pulse density
  unsigned long duration = 1000000 / frequency; // Convert frequency to microseconds
  tone(outputPin, frequency, duration); // Generate the square wave
}

void decreaseFrequency() {
  unsigned long newFrequency = frequency - (frequency * 0.1);
  if (newFrequency >= minFrequency) {
    frequency = newFrequency;
    updateFrequency();
    Serial.print("Frequency decreased to: ");
    Serial.println(frequency);
  } else {
    Serial.println("Frequency is already at the minimum value.");
  }
}

void increaseFrequency() {
  unsigned long newFrequency = frequency + (frequency * 0.1);
  if (newFrequency <= maxFrequency) {
    frequency = newFrequency;
    updateFrequency();
    Serial.print("Frequency increased to: ");
    Serial.println(frequency);
  } else {
    Serial.println("Frequency is already at the maximum value.");
  }
}