44 – Motion Sensor Alarm

int ledPin = 13; // choose the pin for the LED

int inputPin = 2;            // choose the input pin (for PIR sensor)
int pirState = LOW;          // we start, assuming no motion detected
int val = 0;                 // variable for reading the pin status
int pinSpeaker = 10;         //Set up a speaker on a PWM pin (digital 9, 10, or 11)
void setup() {
  pinMode(ledPin, OUTPUT);   // declare LED as output
  pinMode(inputPin, INPUT);  // declare sensor as input
  pinMode(pinSpeaker, OUTPUT);
  Serial.begin(9600);
}
void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    playTone(300, 160);
    delay(150);
    
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
      digitalWrite(ledPin, LOW); // turn LED OFF
      playTone(0, 0);
      delay(300);    
      if (pirState == HIGH){
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}
// duration in mSecs, frequency in hertz
void playTone(long duration, int freq) {
    duration *= 1000;
    int period = (1.0 / freq) * 1000000;
    long elapsed_time = 0;
    while (elapsed_time < duration) {
        digitalWrite(pinSpeaker,HIGH);
        delayMicroseconds(period / 2);
        digitalWrite(pinSpeaker, LOW);
        delayMicroseconds(period / 2);
        elapsed_time += (period);
    }
}