Human Body Sensing IR Pyroelectric Infrared Sensor Anti-theft Alarm Electronic KIT

Passive infrared (PIR) sensors use a pair of pyroelectric sensors to detect heat energy in the surrounding environment. The Pyroelectric infrared sensor anti-theft circuit is composed of a pyroelectric infrared sensor PIR, integrated operational amplifier LM393, 110 alarm circuit, and starting delay circuit. The circuit can be protected against theft. When the family leaves the bedroom, switch K1 is closed, and the circuit begins to work. As long as someone enters the room for some time, it will sound the alarm. Passive Infrared Radiation (PIR) sensor detects the change in infrared radiation of a warm-blooded moving object in its detection range. Features  Sensitivity range: up to 20 feet (6 meters) 110° x 70° detection range. Complete with PIR, Motion Detection. Dual Element Sensor with Low Noise and High Sensitivity. Standard TTL Output.