This Circuit can compare the Light level in an area. It uses a PN Photodiode as the light sensor and IC CA3140 as voltage comparator. The circuit is ideal as the front end of burglar alarm circuits.

Kano’s Motion Sensor Kit is a USB-pluggable sensor that detects direction and distance with infrared. You hook it up to Kano Code to make interactive games, musical instruments, or whatever else ...

This light sensor switch circuit allows the automatic connection of a lamp when the light is low (at nightfall) and will maintain the lamp ON for a certain period of time. This time can be adjusted ...