#define GREEN 25
#define JAUNE 27
#define RED 12
#define buzzer 21


void setup() {
  pinMode(GREEN, OUTPUT);
  pinMode(JAUNE, OUTPUT);
  pinMode(RED, OUTPUT);
  pinMode(buzzer, OUTPUT);

}

void loop() {
  digitalWrite(GREEN,HIGH);
  digitalWrite(JAUNE,LOW);
  digitalWrite(RED,LOW);
  digitalWrite(buzzer, LOW);
  delay(2000);
  digitalWrite(GREEN,LOW);
  digitalWrite(JAUNE,HIGH);
  digitalWrite(RED,LOW);
  digitalWrite(buzzer, LOW);
  delay(2000);
  digitalWrite(GREEN,LOW);
  digitalWrite(JAUNE,LOW);
  digitalWrite(RED,HIGH);
  digitalWrite(buzzer, HIGH);

  delay(1000);

}