ArduinoBasics - 6. PIR sensor, buzzer and LED

/// A passive infrared sensor (PIR sensor) is an electronic sensor
// that measures infrared (IR) light radiating from objects in its field of view.
// They are most often used in PIR-based motion detectors. PIR sensors are commonly
// used in security alarms and automatic lighting applications.
// PIR sensors detect general movement, but do not give information on who or what moved.

int ledPin = 9;
int buzzerPin = 10;
int sensorPin = 11;
bool isSensorDetecting;
// bool state;

void setup()
{
  pinMode(sensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop()
{
  isSensorDetecting = digitalRead(sensorPin);
  // The sensor can understand i an object exists or no (0 or 1)
  if(isSensorDetecting == true){
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000);
    delay(500);
    // I will make the reverse thing in order to have sth like alarm
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
    delay(500);
  }
  else{
    digitalWrite(ledPin, LOW);
  }
}