DIY Automatic Street Lamp
A simple model I built for my class 10 Physics Project. It uses an LDR, a driving circuit along with a relay+opto-coupler circuit to detect ambient lighting and turn the bulb on as soon as the light decreases by a certain level (can be adjusted through a potentiometer connected in series with the LDR to change its resistance). The project is unique in the sense that it does not use a micro controller.
For more info and pictures of this project, visit:
www.hrithikbansal.com