Motion Sensor Activated Mains Relay

A PCB that uses 120VAC (mains) to turn on a relay for a set amount of time, triggered by a small PIR sensor.

Cornelius Robinson

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Description

I could have bought a motion-activated light, but this was more fun. I designed this board to fit into a ceiling-mount electrical enclosure. I didn't want to deal with batteries, so I used a power supply to rectify mains power from one of the screw terminals. Multiple protection components were used in case of a power surge or other incident. A small PIR sensor from Adafruit was used and had a built in timer. I simply needed to provide a few external components to control how much time the relay was on. Connecting a light was simply a matter of connecting the fixture to the other screw terminal.