//definisi variabel
#define ledm 2
#define ledk 3
#define ledh 4
#define pinBuzzer 5
//persiapan awal
void setup() {
  pinMode (ledm, OUTPUT);
  pinMode (ledk, OUTPUT);
  pinMode (ledh, OUTPUT);
}
//program yang dijalankan terus-menerus
void loop() {
  digitalWrite(ledm, HIGH);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, LOW);
  delay(500);
  tanda_peringatan();
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, HIGH);
  digitalWrite(ledh, LOW);
  delay(500);
  tanda_peringatan();
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, HIGH);
  delay(500);
  tanda_peringatan();
}
void tanda_peringatan() {
  tone(pinBuzzer,800,100);
  tone(pinBuzzer,1500,200);
  tone(pinBuzzer,1000,100);
}