#define RED 5
#define YELLOW 4
#define GREEN 2

void setup() {
 pinMode(5, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(2, OUTPUT);
}

void loop() {

  digitalWrite(GREEN, HIGH);
  delay(3000);

  digitalWrite(GREEN, LOW);
  digitalWrite(YELLOW, HIGH);
  delay(500);

  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, HIGH);
  delay(2000);

  digitalWrite(YELLOW, HIGH);
  delay(500);
  digitalWrite(YELLOW, LOW);
  digitalWrite(RED, LOW);



}