this DIY motion trigger for a DSLR is a quick and easy build, and probably loads more fun. The BOM on [Jeremy S Cook]’s build is extremely short – just a PIR sensor and an optoisolator ...

(Passive InfraRed sensor) A device used to detect motion by receiving infrared radiation. When a person walks past the sensor, it detects a rapid change of infrared energy and sends a signal.

As an example, [Circuit Valley] has an IKEA Vallhorn motion sensor for a teardown, it’s as you might expect, a passive infrared sensor (PIR) sensor coupled with a Zigbee interface. Inside the ...

Unique clip-on pet pattern mask. Adjustable 1, 2 and 3-pulse counter virtually eliminates false alarms. Sealed optical chamber protects sensor from insects and air currents. Temperature compensation ...

But you need to buy additional hardware like motion sensors to make this “magic ... or superior” to passive infrared sensing (PIR) tech, which is traditionally used for motion sensing.

Once it is active, the detector starts sending alarm states to the hub only if an identical motion signal is registered by both PIR sensors. If it is disabled, MotionProtect Curtain sends an alarm ...

It comes with a PIR motion sensor that will automatically activate when it detects motion within 30 feet. Equipped with 3 D-cell batteries you can install them in big bathrooms, porches ...