Note: Meabe there is already Instrucatble like this, but here is my version.
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Signing UpStep 1Parts, and let's start
*Optic computer mouse
*Screw driver
*100mcd 20mA blue LED
*Soldering iron
*Solder
So, when you have parts and materials, start workin'. Open your mouse(there is usually just one screw), remove wheel and cable.
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L
red is one of the best by default; but most all work -
infrared, (really neat, 'invisible),
blue (works good on jeans, terrible on dark surfaces),
Green, not so great,
UV - works great on anything uv reactive, terrible on anything else. Surprising that some dark surfaces work awesome when they make no visible reflection.
White - pretty awesome.
Remember you may need to change an led on the board if you change colours - blue and white take more voltage than green red yellow.
It may be cool to have multiple LEDs (or multicolor LED) and be able to choose the color using some switch. Switching between White and IR seems to be usefull (but little bipolar :-)
I think white, because it 'glows' under UV light right?
Basically the sensor doesn't SEE uv, but if the uv hits something and it floresces a visible colour (like the bright purple or green that comes off various surfaces), the sensor will see it.
L