// Define pin numbers for the LEDs
const int greenLED = 16; // Adjust this pin according to your setup
const int yellowLED = 17; // Adjust this pin according to your setup
const int redLED = 18;    // Adjust this pin according to your setup

void setup() {
  // Initialize the serial monitor
  Serial.begin(115200);
  
  // Set the LED pins as OUTPUT
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  
  // Start with all LEDs off
  digitalWrite(greenLED, LOW);
  digitalWrite(yellowLED, LOW);
  digitalWrite(redLED, LOW);
}

void loop() {
  // Continuous sequence
  Serial.println("Go for Green");
  blinkLED(greenLED, 20);  // Green LED for 20 seconds
  Serial.println("Wait for Yellow");
  blinkLED(yellowLED, 3);  // Yellow LED for 3 seconds
  Serial.println("Stop for Red");
  blinkLED(redLED, 2);     // Red LED for 2 seconds
}

void blinkLED(int pin, int duration) {
  unsigned long endTime = millis() + (duration * 1000);  // Calculate the end time based on duration
  while (millis() < endTime) {
    digitalWrite(pin, HIGH);  // Turn LED on
    delay(1000);              // Wait for 1 second
  }
  digitalWrite(pin, LOW);     // Turn LED off after duration
}