// Define pins for the encoder and switch
#define CLK_PIN A2
#define DT_PIN A1
#define SW_PIN D9

// Variables to store encoder state
volatile int encoderPos = 0;
volatile int lastCLKState = LOW;
volatile bool lastSWState = HIGH; // Initialize switch state to HIGH (not pressed)

void setup() {
  Serial.begin(9600); // Start serial communication
  pinMode(CLK_PIN, INPUT_PULLUP); // Set encoder pins as inputs with pull-up resistors
  pinMode(DT_PIN, INPUT_PULLUP);
  pinMode(SW_PIN, INPUT_PULLUP);
}

void loop() {
  // Read the state of the CLK pin
  int CLKState = digitalRead(CLK_PIN);
  
  // Detect rising edge of CLK
  if (CLKState != lastCLKState && CLKState == HIGH) {
    // If the DT pin is high, the encoder is rotating clockwise
    if (digitalRead(DT_PIN) == HIGH) {
      encoderPos++;
    } else { // Otherwise, the encoder is rotating counterclockwise
      encoderPos--;
    }
  }
  
  // Read the state of the switch
  bool SWState = digitalRead(SW_PIN);
  
  // Detect falling edge of the switch (button press)
  if (SWState != lastSWState && SWState == LOW) {
    // Print encoder position when the switch is pressed
    Serial.println("Switch pressed. Encoder position: " + String(encoderPos));
  }
  
  lastCLKState = CLKState;
  lastSWState = SWState;
}