I'm going to show you a simple, adjustable light sensor circuit that activates in low light.
Light sensing circuits are versatile and simple enough for beginners to build but have many useful applications.
The circuit I am presenting is to be used as a headlamp for my robot A3-8D (anyone in manufacturing may get joke.) This lamp will automatically turn on when the robot enters a dark room. This will save precious microprocessor inputs and outputs.
Step 1: The Schematic and the Parts
The schematic is daily simple and there are not too many part required
Parts you will need:
- LEDs from a dollar store flashlight
- 1 x Transistor 2N4401
- 1 x Photoresistor
- 1 x 100 ohm resistor
- 1 x 100K ohm Variable-resistor
- Breadboard and hookup wire
- Perfboard, wire and soldering materials