Detecting money can be very useful for allot of people. For instance shop owners, you don't want people to buy stuff from you with fake money.
This money detector disguised as a mouse will look nice behind the counter and is very easy to use.

I got this idea when I found this mouse in some junk box upstairs. Unfortunately this mouse died... about 15 years ago.
Can you believe it, this mouse had a ball inside of it. I used these mouses allot back in the day, and I think some youngster don't even know a mouse like this did exist :)

Anyway, below you'll see a movie and some photos of the end result.
Hope this instructable is useful for you. Or at least fun to watch :)

Note: The photo below and in the movie show blue light coming from the UV LED. I think it has something to do with my camera not being able to capture UV light correctly. The UV light coming from the LED is more of a purple color.

Step 1: Materials & Tools

There aren't too many materials needed to make this. Next to this the materials are pretty cheap. So it doesn't have to cost much to make this.

You need:

 - Old mouse (Using a new one would be stupid. But if you feel like using a new one, be my guest)
 - 1x UV LED 5mm
 - Button cell 3v
(I used a CR2032)
 - Button cell holder
 - Electrical wire
 - Tinfoil
(sorry, forgot to put this in the photo below).

 - Screwdriver
 - Glue gun (hot glue)

Once you've got this stuff you can start.
I've got to note that there are some parts in building this where you need to be gently and patient (that's when we're going to use the tinfoil :)

If it's an optical mouse, then can't you just switch the diodes (not that it would be good for the UV diode, but it would be a whole lot easier)
Wow...<br> <br> i just bought a Motion Detector from <a href="http://www.jmacsupply.com" rel="nofollow">jmac supply</a>, I bet they don't sell this there!<br> <br> Well dont my friend!
can we use super glue. and is it necessary to use a mouse which has the ball..
how can i now know if my notes are fake or they are okey ?<br>
Those balls are heavy
That's because theres a steel ball inside the rubber
&nbsp;THese are my favorite mice, I still have them.<br /> I like using a switch off the circuit board, and using that. but ur idea's good to.
Clever idea, but I'm sure if you cut away the front part of the mouse circuit board (around 7/8ths of it) you would have enough room for the battery and still be able to use the original button microswitches rather than the less reliable tinfoil switch.<br />
I thougt about that for a while.<br /> But I don't know the first thing about soldering and have no clue where to solder the LEDs on, or the wires and battery.<br /> <br /> So I thougt i'd rip everything out and do it my way, the way I will inderstand. :)<br /> Thanks for your comment!
yea its still astep up from me 2 years ago when i still blue-tacked things together to see if it would work =)
wouldnt it be easier to use the microswitches already in the mouse
&nbsp;NEEEVERRRR! I mean yes.
&nbsp;Purdy neat... (and this coming from a contest competitor :) )

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