#define ledmerah 13
#define ledkuning  12
#define ledhijau 11
#define buzzer 4

void setup() {
  pinMode(ledmerah, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(ledhijau, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  digitalWrite(buzzer, LOW);
  tone(4,10000,10000);
  digitalWrite(ledmerah, HIGH);
  delay(100);
  digitalWrite(ledmerah, LOW);
  delay(100);
  digitalWrite(ledkuning, HIGH);
  delay(100);
  digitalWrite(ledkuning, LOW);
  delay(100);
  digitalWrite(ledhijau, HIGH);
  delay(100);
  digitalWrite(ledhijau, LOW);
  delay(100);
}