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Picture of Light Graffiti Cans from Shampoo Bottles
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These light graffiti cans give the feeling that you're spray painting with light.  Combine these with the free software at http://glowdoodle.com/ or http://mylightpainting.com/ and you've got a virtual 3D graffiti wall.  You can also use these with a long camera exposure in a dark room.

This version is very easy to build and requires few tools.  For building these with real spray paint cans, check out this tutorial:
http://www.instructables.com/id/DIY-8-Light-Spray-Graffiti/

Step 1: Gather Parts

Picture of Gather Parts
Parts:
LED in color of choice
Shampoo Bottle
Any type of Wire (22 Gauge stranded works well, 2 colors preferred)
Battery holder for 2 AAA or AA
Momentary Pushbutton Switch (Normally Open, or N.O. on package)
Masking tape (not shown)

Tools:
Scissors
Wirecutters (could get by with only scissors in a pinch)
Soldering iron & Solder (optional, can use tape, but recommended)
Drill and/or hand reamer
Hot glue gun & glue
 
These work also great with the free software for webcam at www.mylightpainting.com. Thanks for the nice tutorial.

dreamexplorer (author)  akustikbasti4 years ago
Thanks for the link! It looks like the "day mode" and "fade on/off" options will be very useful.