void setup() {
  pinMode(2, INPUT);
  pinMode(3, OUTPUT); //THIS IS THE RED LIGHT
  pinMode(4, OUTPUT); //THIS IS THE BLUE LIGHT
  pinMode(5, OUTPUT); //THIS IS THE GREEN LIGHT
}

void loop() {
  digitalWrite(3, HIGH); //THIS IS HOW TO TURN ON THE RED LIGHT
  delay(2000);           //this is how to wait 2 seconds
  digitalWrite(4, HIGH); //THIS IS HOW TO TURN ON THE blue LIGHT
  delay(2000);
  digitalWrite(4, LOW); //THIS IS HOW TO TURN off THE blue LIGHT
  delay(2000);
  //note because the blue and red lights are on its purple
}