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From: sac90286@uxa.cso.uiuc.edu
Newsgroups: comp.sys.ibm.pc
Subject: Light Pen Plans Sought
Message-ID: <111700146@uxa.cso.uiuc.edu>
Date: 14 Sep 89 23:05:26 GMT
Lines: 12
Nf-ID: #N:uxa.cso.uiuc.edu:111700146:000:624
Nf-From: uxa.cso.uiuc.edu!sac90286    Sep 13 13:24:00 1989


I'm looking for plans, schematics, or any other information which would enable
me to build an IBM PC compatible light pen. I have a CGA card with the standard
IBM light pen port; all I need is the pen itself. As I understand it, the only
working parts required are a photodiode/phototransistor and a microswitch, both
small enough to mount inside a ball-point pen body. The light pen interface has
a +5V and a +12V connection, a light pen input, a pen switch input, and (of
course) a ground. Have I missed anything? How would I need to wire these parts
together? Any and all assistance appreciated!

Scott
kubla@uiuc.edu