// Define the pins for each LED
const int redPin = 2;
const int yellowPin = 3;
const int greenPin = 4;

// Define timing for each state (in milliseconds)
const int greenDuration = 5000;  // 5 seconds for green light
const int yellowDuration = 2000; // 2 seconds for yellow light
const int redDuration = 5000;    // 5 seconds for red light

void setup() {
  // Initialize the pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // Green light
  digitalWrite(greenPin, HIGH);
  delay(greenDuration);

  // Yellow light
  digitalWrite(greenPin, LOW);
  digitalWrite(yellowPin, HIGH);
  delay(yellowDuration);

  // Red light
  digitalWrite(yellowPin, LOW);
  digitalWrite(redPin, HIGH);
  delay(redDuration);

  // Red & Yellow light (Transition)
  digitalWrite(redPin, LOW);
  digitalWrite(yellowPin, HIGH);
  delay(yellowDuration / 2); // Half the duration of yellow light

  // Turn off all lights (Transition)
  digitalWrite(yellowPin, LOW);
  delay(yellowDuration / 2); // Half the duration of yellow light
}