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).
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.
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.
I got a few questions about whether it would be possible to get the image from the
USB or PS/2-port of the mouse, so you can view the image of an unmodified mouse.
The answer is: In theory, it could be possible, if the microcontroller between
the port and the sensor-IC supports some kind of pass-through-mode so you
can use it to talk directly to the sensor. In practice though, I don't know of
any chip that supports that kind of mode, so the answer would have to be: Nope,
as far as I know, it can't be done.
By the way, if you search for datasheets, it seems that Agilent has spun off
their optical division to a new company called
Avago.
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