Review on Highly Sensitive 4PCS PIR Motion Sensor HC-SR312 Pyroelectric Infrared Detector Modules with DC 2.7-12V Range - AM312 Human Sensor Module by William Bell
Great compact PIR sensor!
Great little sensors that work reliably for what I use them for. The sensor is fairly compact (10mm diameter) and is great if you're short on space. Solder pins and wire directly onto the board if you need an even smaller size. I use them with an Arduino Nano clone to turn on LEDs.
- Motion detector
- There are other interesting options.
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