Well, perhaps not exact, but you could get an idea of the hand’s motion from right to left ... we did a similar project a few years ago using one sensor and the Arduino’s ability to appear ...

The BOM on [Jeremy S Cook]’s build is extremely short – just a PIR sensor and an optoisolator ... does is trigger the camera when motion is sensed, but one could be added to support more ...

If you're also looking to illuminate pathways, entryways, or doorways, the right motion sensor lights can make ... proves three heads are better than one. It earns our top recommendation due ...