// Pin assignments
const int encoderPinA = 2; // Interrupt pin for Encoder A
const int encoderPinB = 3; // Interrupt pin for Encoder B
const int ledCW = 9;       // LED for clockwise direction
const int ledCCW = 10;     // LED for counterclockwise direction
const int ledIdle = 11;    // LED for idle state

// Variables
volatile long lastEncoderChange = 0; // Last time the encoder moved
const long idleTimeout = 1000;       // 2 seconds in milliseconds

void setup() {
  // Set the pin modes
  pinMode(encoderPinA, INPUT);
  pinMode(encoderPinB, INPUT);
  pinMode(ledCW, OUTPUT);
  pinMode(ledCCW, OUTPUT);
  pinMode(ledIdle, OUTPUT);

  digitalWrite(ledIdle, HIGH);

  // Attach interrupts for the rotary encoder
  attachInterrupt(digitalPinToInterrupt(encoderPinA), encoderMoved, CHANGE);
}

void loop() {
  long currentTime = millis();

  // If there's no movement for more than 2 seconds, turn on the idle LED
  if (currentTime - lastEncoderChange > idleTimeout) {
    digitalWrite(ledCW, LOW);
    digitalWrite(ledCCW, LOW);
    digitalWrite(ledIdle, HIGH);
  }
}

// ISR for encoder movement
void encoderMoved() {
  lastEncoderChange = millis(); // Update the last movement time

  bool a = digitalRead(encoderPinA);
  bool b = digitalRead(encoderPinB);

  // Determine the direction based on quadrature signals
  if (a == b) {
    // Clockwise
    digitalWrite(ledCW, HIGH);
    digitalWrite(ledCCW, LOW);
    digitalWrite(ledIdle, LOW); // Turn off the idle LED
  } else {
    // Counterclockwise
    digitalWrite(ledCW, LOW);
    digitalWrite(ledCCW, HIGH);
    digitalWrite(ledIdle, LOW); // Turn off the idle LED
  }
}