Power Saver Circuit Diagram using PIR - Engineering Projects And, so to eradicate such issues, we have developed a Power Saver Circuit Diagram based on Passive infrared sensor that employs PIR motion sensor to detect presence of human beings and as they leave the room, turns any electrical appliances connected to the circuit after a certain defined time interval. The circuit works automatically and turns the lights once anyone enters the room and thus [PDF] PIR Motion Sensor - Adafruit Industries PIR sensors are rather generic and for the most part vary only in price and sensitivity. Most of the real magic happens with the optics. This is a pretty good idea for manufacturing: the PIR sensor and circuitry is fixed and costs a few dollars. The lens costs only a few cents and can change the breadth, range, sensing pattern, very easily.
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