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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

Thanks I wish I had more time to get A3 mobile.
<p>Awesome project! It really looks professional on that robot of yours</p>
Thank You

About This Instructable

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Bio: I work in industrial automation and spend any free time making.
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