PIR Motion Sensor

Description

PIR "Passive Infrared"sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. How to Use PIR Sensor The PIR sensor have 3 pins: Power: 3-5 VDC Output: High (when motion detected) Low (no motion detected) Ground: connected to ground The output pin will go "high" to 3.3V and light up the LED when motion detected. Specifications: Input Voltage: DC 3-5V Output signal: 3.3V (motion detected-output high) Detection Angle: 110 degree Detection Angle: max 7 m How Does The PIR Sensor Work The PIR sensor itself has two slots each one of them is made of a special material that is sensitive to infrared. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor. This causes a positive differential change between the two halves. These change pulses are what is detected. How to use PIR Sensor with Arduino, please click to download