// Define pins for rotary encoder
#define CLK_PIN 2  // CLK pin of rotary encoder
#define DT_PIN 3   // DT pin of rotary encoder
#define LED_PIN 5  // LED pin

// Variables to store encoder state and count
volatile int encoderCount = 0;
volatile int prevCLKState = LOW;

void setup() {
  Serial.begin(9600);

  // Set LED pin as output
  pinMode(LED_PIN, OUTPUT);

  // Set CLK and DT pins as input with pullup resistors enabled
  pinMode(CLK_PIN, INPUT_PULLUP);
  pinMode(DT_PIN, INPUT_PULLUP);

  // Attach interrupt for CLK pin
  attachInterrupt(digitalPinToInterrupt(CLK_PIN), updateEncoder, CHANGE);
}

void loop() {
  // Map encoder count to a range of brightness (0 to 255)
  int brightness = map(encoderCount, 0, 60, 0, 255);

  // Update LED brightness
  analogWrite(LED_PIN, brightness);

  // Print current brightness value
  Serial.print("Brightness: ");
  Serial.println(brightness);

  delay(100); // Add a small delay for stability
}

// Interrupt service routine to update encoder count
void updateEncoder() {
  int CLKState = digitalRead(CLK_PIN);
  int DTState = digitalRead(DT_PIN);

  // Check if the CLK state has changed
  if (CLKState != prevCLKState) {
    // Check the direction of rotation
    if (CLKState == HIGH && DTState == LOW) {
      encoderCount++; // Clockwise rotation
    } else if (CLKState == LOW && DTState == HIGH) {
      encoderCount--; // Counterclockwise rotation
    }
  }

  // Update previous CLK state
  prevCLKState = CLKState;

  // Ensure encoder count stays within bounds
  encoderCount = constrain(encoderCount, 0, 60);
}