ОБЬЕКТ ТООЛОХ

 int irs = 7;

int counter = 0;

void setup()
{
  Serial.begin(9600);
  pinMode(irs,INPUT);
}

void loop()
{
  while(digitalRead(irs)==LOW)
  {
    counter++;
    Serial.print("Count: ");
    Serial.println(counter);
    delay(2000);
  }
}

https://vsa.edu.in/b7-object-counter-using-serial-monitor/