LED Throwie

Description

Especially creepy when sticking two of them on the eyes of a statue.

ATTENTION: For red, yellow and orange use a 120 Ohm resistor. For blue, green or white no resistor is needed.

Wikipedia: An LED throwie is a small LED attached to a coin battery and a rare earth magnet (usually with conductive epoxy or electrical tape), used for the purpose of creating non-destructive graffiti and light displays. Artists use them by throwing individual LEDs onto metallic objects, like public sculpture or road infrastructure. By throwing LEDs onto an object, the object itself acts as a canvas. LED throwies were invented in 2006 by the artists Evan Roth and James Powderly the founder of Graffiti Research Lab at Eyebeam Atelier open lab NYC. After Graffiti Research Lab posted the instructions how to make a throwie on Instructables.

Components

1 × LED Fiber Optics / Emitters

1 × Coin cell 3V CR2032 Power

1 × Photoresistor GL5516

1 × Resistor 10 kOhm Pull-Up

1 × Resistor 120 Ohm Only for red/yellow/orange LEDs

Build Instructions

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1

Step 1

Assemble according to circuit schematics (see pictures).

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Discussions

Yann Guidon / YGDES wrote 03/24/2017 at 04:06

If you increase Rpullup, you reduce the base current, so you can save the Rled and reduce the battery drain during daytime. It depends on your transistor's current gain, you can also try with a 470K trimpot :-)

Now, what if you found a light-sensitive resistor with a reverse characteristic ? shorting the base to 0V is a wasteful strategy...

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LED Throwie

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