Are you using an optical mouse right now? Ever wanted to see your
desktop through the eye on the bottom of it? Me neither, I already know
I have to clean my desktop
People get bored sometimes, and when I get bored I sometimes open up
stuff to find out what makes it tick. One time, I did this with an old
optical mouse. Well, a mouse only has 2 chips inside: the optical
sensor and a chip for the usb/ps2-interfacing. I looked up the
datasheet of the optical sensor (which is an ADNS2610) and it told me
the sensor has a tiny 18x18 CCD, which can be read out using the serial
port (the one which normally interfaces to the PS2/USB-chip).
So I start Visual Basic (I usually do my stuff under Linux, but I'm no
star at using anything graphical like QT or GTK, so for this
quick'n'dirty project I fell back in my old habits) and hack something
up using a few wires to the trusty ole parallel port. The result: crisp
lo-res b&w imaging
As you can see, the mouse was over some text with an 'e' in it.
One of the more obvious features of a mouse, however, is that it can
detect movement. Combine this with the just-aquired imaging features,
and we have a ghetto b&w handscanner. This is a 'scanned' piece of
a receipt:
I can understand you can't wait to have such a handy scanner yourself. And now, you can! The software is downloadable here.
Code:
http://sprite.student.utwente.nl/~jeroen/projects/mouseeye/readmouse.zip
The software works on mice which use an ADNS-2610 optical sensor,
recognisable by the eight pins, the sun-like mark and the text 'A2610'.
I've seen this sensor in most cheap optical mice that aren't too old.
To hook it up, check out the pinout in the datasheet, then on the PCB
cut the traces running from the sensors SCK- and SDIO-pins to the rest
of the mouse. Then connect the sensor, using a diode, to a parallel
port, like this:
pp: adns-2610:
25-----------------GND
12----------+------SDIO
5 -----|<|--+
9 -----------------SCK
Plug in the USB/PS2-plug (or apply 5V to the Vcc-pin of the sensor), run the software and you should be OK
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