// Traffic Light Arduino Uno Code

const int redPin = 13;    // Red LED connected to digital pin 13
const int greenPin = 12;  // Green LED connected to digital pin 12
const int orangePin = 11; // Orange LED connected to digital pin 11

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(orangePin, OUTPUT);
}

void loop() {
  // Red light for 4 seconds
  digitalWrite(redPin, HIGH);
  delay(4000);  // 4 seconds
  digitalWrite(redPin, LOW);

  // Green and Red lights together for 5 seconds
  digitalWrite(greenPin, HIGH);
  digitalWrite(redPin, HIGH);
  delay(5000);  // 5 seconds
  digitalWrite(greenPin, LOW);
  digitalWrite(redPin, LOW);

  // Orange light for 1 second
  digitalWrite(orangePin, HIGH);
  delay(1000);  // 1 second
  digitalWrite(orangePin, LOW);

  // Green and Red lights together for 4 seconds
  digitalWrite(greenPin, HIGH);
  digitalWrite(redPin, HIGH);
  delay(4000);  // 4 seconds
  digitalWrite(greenPin, LOW);
  digitalWrite(redPin, LOW);
}