Buy now the Pro-Range-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 pyroelectric infrared sensor PIR, integrated operational amplifier LM393, 110 alarm circuit and starting delay circuit. The circuit can be protect against theft. When the family leaves bedroom, switch K1 is closed, the circuit begins to work . As long as  someone enters the room for a period of time, it will sound the alarm. Passive Infrared Radiation (PIR) sensor detects the change in infrared radiation of warm blooded moving object in its detection range.

Features:

1.  Sensitivity range: up to 20 feet (6 meters) 110° x 70° detection range.
2. Complete with PIR, Motion Detection.
3. Dual Element Sensor with Low Noise and High Sensitivity.
4. Standard TTL Output.

Package Includes:

1 x Pro-Range HC-SR501 PIR Based Human body sensing Anti-theft Alarm DIY Electronic kit for students