void setup() 
{
  pinMode(2, OUTPUT);//red
  pinMode(3, OUTPUT);//yellow
  pinMode(4, OUTPUT);//green
  Serial.begin(9600);
  // put your setup code here, to run once:

}

void loop()
{
  digitalWrite(2, HIGH);
  Serial.println("red light on");
  delay(8000);
  digitalWrite(2, LOW);
  Serial.println("red light off");
  digitalWrite(3, HIGH);
  Serial.println("yellow light on");
  delay(3000);
  digitalWrite(3, LOW);
  Serial.println("yellow light off");
  digitalWrite(4, HIGH);
  Serial.println("green light on");
  delay(5000);
  digitalWrite(4, LOW);
  Serial.println("green light off");

  // put your main code here, to run repeatedly:

}