/*
PIR sensor alarm
*/
// constants won't change. They're used here to
// set pin numbers:
// in Pin 2 we will connect the PIR sensor
// signal. Give it a name.
const int pirPin = 2;
// in Pin 12 we will connect the piezoelectric
// speaker. Give it a name.
const int speakerPin = 12;
// variables will change:
// variable for reading the PIR status
// we start, assuming no motion detected
int pirState = LOW;
// the setup routine runs once when you press
// reset:
void setup() {
// initialize the speaker pin as an output
pinMode(speakerPin, OUTPUT);
// initialize the PIR pin as an input
pinMode(pirPin, INPUT);
}
// the loop routine runs over and over again
// forever:
void loop() {
// read the state of the PIR sensor
pirState = digitalRead(pirPin);
// check if the PIR detected motion.
// if it is, the pinState is HIGH.
if (pirState == HIGH) {
// play siren tones
noTone(speakerPin);
tone(speakerPin, 40, 200);
tone(speakerPin, 494, 500);
tone(speakerPin, 53, 300);
} else {
// stop speaker
noTone(speakerPin);
}
}
