Diagram of PIR Motion Sensor

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Here is a simple project you can do with a PIR (passive infrared)sensor and an LED and Buzzer;

1. Connect the positive leg of the LED (the longer leg)to digital pin 9 on the Arduino.

2.connect the negative leg of the LED(the shorted leg)to a ground pin on the Arduino

3. connect the VCC pin on the PIR sensor to 5V on

the Arduino

4. connect the GND pin on the PIR sensor to a ground pin on the Arduino.

5. connect the OUT  pin on the PIR sensor to digital pin 2 on the  Arduino.    

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