When a person walks past the sensor, it detects a rapid change of infrared energy and sends a signal. PIR sensors are used for applications such as automatically turning on lights when someone ...

While PIR sensors are inexpensive, radar technologies are decreasing in cost and becoming more compact and simple to design. Radar solutions can range from simple motion detection to complex imaging ...

The BOM on [Jeremy S Cook]’s build is extremely short – just a PIR sensor and an optoisolator, with a battery, a plug for the camera’s remote jack, and a 3D-printed bracket. The PIR sensor ...