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From: "steve synakowski"
Subject: Re: Detecting black marks on paper
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Tue, 14 Jan 2003 15:41:44 GMT
NNTP-Posting-Date: Tue, 14 Jan 2003 10:41:44 EST
Organization: Road Runner
"Duane" wrote in message
> I am learning electronics as a hobby and was wondering what it would
> take to make a sensor that I could move over (by hand) a sequence of
> black lines (something like printed morse code) and make sounds or
> flash LEDs. I don't need any pattern recognition -- it would fine to
> light an LED when a line is detected. I am looking for something
> simple - and cheap :)
Here's a simple reflective sensor that could be a starting point, but is
somewhat expensive. It depends on how you want to trade off $ for ease of
use. You could use this to switch your LED or speaker tone on/off.
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