#define BUZZER 12
#define Button 21

hw_timer_t *My_timer = NULL; //set Timer object

void IRAM_ATTR onTimer(){ // function that set in ram 
  tone(BUZZER, 1047 ,500);
  tone(BUZZER, 1319 ,250);
  tone(BUZZER, 1397 ,250);
  tone(BUZZER, 1397 ,250);
  tone(BUZZER, 1760 ,250);
  noTone(BUZZER);  

}




void setup(){
  pinMode(BUZZER, OUTPUT);
  pinMode(Button, OUTPUT);
  My_timer = timerBegin(0, 80, true);  // use tiemr 0 and set prescale to 80 so 1 tick is 1 uSec
  timerAttachInterrupt(My_timer, &onTimer, true); // point to the ISR
  timerAlarmWrite(My_timer, 5000000, true);  // set alarm every 1 sec
  timerAlarmEnable(My_timer);  // enable the alarm
}




void loop() {  

}