// Define pins for North traffic light
const int redNorth = 23;
const int yellowNorth = 22;
const int greenNorth = 21;

// Define pins for East traffic light
const int redEast = 19;
const int yellowEast = 18;
const int greenEast = 17;

// Define pins for South traffic light
const int redSouth = 16;
const int yellowSouth = 15;
const int greenSouth = 14;

// Define pins for West traffic light
const int redWest = 13;
const int yellowWest = 12;
const int greenWest = 05;

// Timing constants (in milliseconds)
const int greenTime = 15000; // 15 seconds
const int yellowTime = 3000;  // 3 seconds
const int redTime = 15000;    // 15 seconds

void setup() {
  // Initialize pins for North traffic light
  pinMode(redNorth, OUTPUT);
  pinMode(yellowNorth, OUTPUT);
  pinMode(greenNorth, OUTPUT);

  // Initialize pins for East traffic light
  pinMode(redEast, OUTPUT);
  pinMode(yellowEast, OUTPUT);
  pinMode(greenEast, OUTPUT);

  // Initialize pins for South traffic light
  pinMode(redSouth, OUTPUT);
  pinMode(yellowSouth, OUTPUT);
  pinMode(greenSouth, OUTPUT);

  // Initialize pins for West traffic light
  pinMode(redWest, OUTPUT);
  pinMode(yellowWest, OUTPUT);
  pinMode(greenWest, OUTPUT);

  // Start with North-South green, East-West red
  digitalWrite(greenNorth, HIGH);
  digitalWrite(redEast, HIGH);
  digitalWrite(redSouth, HIGH);
  digitalWrite(redWest, HIGH);
}

void loop() {
  // North-South Green, East-West Red
  digitalWrite(greenNorth, HIGH);
  digitalWrite(redSouth, HIGH);
  digitalWrite(redEast, HIGH);
  digitalWrite(redWest, HIGH);
  delay(greenTime);

  // North-South Yellow
  digitalWrite(greenNorth, LOW);
  digitalWrite(yellowNorth, HIGH);
  digitalWrite(yellowSouth, HIGH);
  delay(yellowTime);

  // All Red (Safety pause)
  digitalWrite(yellowNorth, LOW);
  digitalWrite(redNorth, HIGH);
  digitalWrite(yellowSouth, LOW);
  digitalWrite(redSouth, HIGH);
  delay(1000);  // 1 second safety pause

  // East-West Green, North-South Red
  digitalWrite(greenEast, HIGH);
  digitalWrite(greenWest, HIGH);
  digitalWrite(redNorth, HIGH);
  digitalWrite(redSouth, HIGH);
  delay(greenTime);

  // East-West Yellow
  digitalWrite(greenEast, LOW);
  digitalWrite(greenWest, LOW);
  digitalWrite(yellowEast, HIGH);
  digitalWrite(yellowWest, HIGH);
  delay(yellowTime);

  // All Red (Safety pause)
  digitalWrite(yellowEast, LOW);
  digitalWrite(redEast, HIGH);
  digitalWrite(yellowWest, LOW);
  digitalWrite(redWest, HIGH);
  delay(1000);  // 1 second safety pause

  // Repeat the cycle
}