Project code

// Pins for each LED
int redLed = 2;
int yellowLed = 3;
int greenLed = 4;

void setup() {
  pinMode(redLed, OUTPUT);   // Set red LED pin as output
  pinMode(yellowLed, OUTPUT); // Set yellow LED pin as output
  pinMode(greenLed, OUTPUT); // Set green LED pin as output
}

void loop() {
  // Turn on green LED
  digitalWrite(greenLed, HIGH);
  delay(5000); // Green stays on for 5 seconds

  // Turn off green, turn on yellow
  digitalWrite(greenLed, LOW);
  digitalWrite(yellowLed, HIGH);
  delay(2000); // Yellow stays on for 2 seconds

  // Turn off yellow, turn on red
  digitalWrite(yellowLed, LOW);
  digitalWrite(redLed, HIGH);
  delay(5000); // Red stays on for 5 seconds

  // Turn off red
  digitalWrite(redLed, LOW);
}