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This video shows you how to build a really sensitive glow in the dark circuit that reacts to shadows and slight changes in light. The reason it is so sensitive is that the changes in the current flow through the LDR are multiplied by 40 enabling the LED to be turned on and off by mere shadows.

Also the reason for the 10K variable resistor is that you can build this circuit with almost any kind of LDR

Components used:

•Arduino Uno

•400pts Breadboard

•2N3904 Transistor

•Light Dependent Resistor

•Resistors: 330Ω

•Variable Resistor 1KΩ

•Jumper Wire

p.s: too easy for ya?, well its a part of a free, fully documented (programs+schematics) online course designed to get young kids into electronics, so if you think it's any good pass it on?

Download Handout Below:

<p>Neat design. Thanks for sharing!</p>
<p>Thank you :)</p>

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Bio: I am robotics engineer and a teacher whose passion in life is breaking down the maths and academic jargon of programming and robotics into something ... More »
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