#include <pitches.h>

#define sen 2
#define buz 9

bool state = false;

unsigned long start_time = 0;

int times = 5;

int led = 1 ;

const long period = 200;

void setup() {
  pinMode(sen, INPUT);
  pinMode(buz, OUTPUT);
  pinMode(led, OUTPUT);

}

void loop() {
  state = false;
  int stanje = digitalRead(sen);
  if (stanje == HIGH) {
    state = true;
  }
  if ( state == true) {
    for (int i = 0; i < times; i++) {
      unsigned long timeon = millis();
      if (timeon - start_time>=period){
        digitalWrite(buz, HIGH);
        digitalWrite(led, HIGH);
        unsigned long timeoff = millis();
        if (timeoff - start_time>=period){
          digitalWrite(buz, LOW);
          digitalWrite(led, LOW);
          start_time = timeoff;
        }
        start_time = timeon;
    }
  }
}
}