/*www.theorycircuit.com*/ int pirPin = 2; //digital 2 int buzzerPin = 12; //digital 12 void setup() { Serial.begin(9600); pinMode(pirPin, INPUT); pinMode(buzzerPin, OUTPUT); } void loop() { int pirVal = digitalRead(pirPin); Serial.println(pirVal); if(pirVal == HIGH) { //was motion detected Serial.println("Motion Detected"); digitalWrite(buzzerPin, HIGH); delay(1500); } else { digitalWrite(ledPin, LOW); } }