// Define the pins for each traffic light
const int northRed = 2;
const int northYellow = 3;
const int northGreen = 4;

const int eastRed = 5;
const int eastYellow = 6;
const int eastGreen = 7;

const int southRed = 8;
const int southYellow = 9;
const int southGreen = 10;

const int westRed = 11;
const int westYellow = 12;
const int westGreen = 13;

void setup() {
  // Set all pins as outputs
  pinMode(northRed, OUTPUT);
  pinMode(northYellow, OUTPUT);
  pinMode(northGreen, OUTPUT);

  pinMode(eastRed, OUTPUT);
  pinMode(eastYellow, OUTPUT);
  pinMode(eastGreen, OUTPUT);

  pinMode(southRed, OUTPUT);
  pinMode(southYellow, OUTPUT);
  pinMode(southGreen, OUTPUT);

  pinMode(westRed, OUTPUT);
  pinMode(westYellow, OUTPUT);
  pinMode(westGreen, OUTPUT);

  // Initialize all lights to OFF
  digitalWrite(northRed, LOW);
  digitalWrite(northYellow, LOW);
  digitalWrite(northGreen, LOW);

  digitalWrite(eastRed, LOW);
  digitalWrite(eastYellow, LOW);
  digitalWrite(eastGreen, LOW);

  digitalWrite(southRed, LOW);
  digitalWrite(southYellow, LOW);
  digitalWrite(southGreen, LOW);

  digitalWrite(westRed, LOW);
  digitalWrite(westYellow, LOW);
  digitalWrite(westGreen, LOW);
}

void loop() {
  // Phase 1: North Green, others Red
  setLights(northGreen, northYellow, northRed, HIGH, LOW, LOW); // North Green
  setLights(eastGreen, eastYellow, eastRed, LOW, LOW, HIGH);    // East Red
  setLights(southGreen, southYellow, southRed, LOW, LOW, HIGH); // South Red
  setLights(westGreen, westYellow, westRed, LOW, LOW, HIGH);    // West Red
  delay(5000); // Green for 5 seconds

  // Phase 2: North Yellow, others Red
  setLights(northGreen, northYellow, northRed, LOW, HIGH, LOW); // North Yellow
  delay(2000); // Yellow for 2 seconds

  // Phase 3: East Green, others Red
  setLights(northGreen, northYellow, northRed, LOW, LOW, HIGH); // North Red
  setLights(eastGreen, eastYellow, eastRed, HIGH, LOW, LOW);    // East Green
  delay(5000); // Green for 5 seconds

  // Phase 4: East Yellow, others Red
  setLights(eastGreen, eastYellow, eastRed, LOW, HIGH, LOW); // East Yellow
  delay(2000); // Yellow for 2 seconds

  // Phase 5: South Green, others Red
  setLights(eastGreen, eastYellow, eastRed, LOW, LOW, HIGH);    // East Red
  setLights(southGreen, southYellow, southRed, HIGH, LOW, LOW); // South Green
  delay(5000); // Green for 5 seconds

  // Phase 6: South Yellow, others Red
  setLights(southGreen, southYellow, southRed, LOW, HIGH, LOW); // South Yellow
  delay(2000); // Yellow for 2 seconds

  // Phase 7: West Green, others Red
  setLights(southGreen, southYellow, southRed, LOW, LOW, HIGH); // South Red
  setLights(westGreen, westYellow, westRed, HIGH, LOW, LOW);    // West Green
  delay(5000); // Green for 5 seconds

  // Phase 8: West Yellow, others Red
  setLights(westGreen, westYellow, westRed, LOW, HIGH, LOW); // West Yellow
  delay(2000); // Yellow for 2 seconds
}

// Helper function to set the state of a traffic light
void setLights(int greenPin, int yellowPin, int redPin, bool greenState, bool yellowState, bool redState) {
  digitalWrite(greenPin, greenState);
  digitalWrite(yellowPin, yellowState);
  digitalWrite(redPin, redState);
}