const int redPin = 2;
const int yellowPin = 4;
const int greenPin = 5;

void setup() {
  // put your setup code here, to run once:
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  digitalWrite(redPin, HIGH);
  Serial.println("Red light ON");
  delay(200);
  digitalWrite(redPin, LOW);
  Serial.println("Red light OFF");
  delay(200);
  digitalWrite(yellowPin, HIGH);
  Serial.println("Yellow light ON");
  delay(200);
  digitalWrite(yellowPin, LOW);
  Serial.println("Yellow light OFF");
  delay(200);
  digitalWrite(greenPin, HIGH);
  Serial.println("Green light ON");
  delay(200);
  digitalWrite(greenPin, LOW);
  Serial.println("Green light OFF");
  delay(200);

  // put your main code here, to run repeatedly:
  //delay(10); // this speeds up the simulation
}