Path: utzoo!attcan!uunet!ogicse!milton!whit
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Information on bar-codes
Summary: Worked example in Motorola manual
Message-ID: <8316@milton.u.washington.edu>
Date: 29 Sep 90 18:52:23 GMT
References: <90270.174349ESV@psuvm.psu.edu>
Organization: University of Washington, Seattle
Lines: 22

In article <90270.174349ESV@psuvm.psu.edu> ESV@psuvm.psu.edu (ANDREW COLL) writes:
>Greetings All:
>I would like to know if anyone out there knows of a good
>source of information on barcode decoding.

	Motorola's "M6800 Microprocessor Applications Manual" has a complete
worked example of a barcode reader.  They refer to  _UPC Symbol Specification_
available from 
	Distribution Number Bank
	1725 K Street, N.W.
	Washington, DC
	(202) 833-1134
I recommend the Motorola book (it's an oldie, probably you'll have
to scrounge to find a copy), as it discusses most of the timing and
signal conditioning as well as the recognition algorithm.  
	In addition, HP sells prebuilt reader wands and (I hear)
some sort of digital chip (chip set?) that makes a complete reader for
reasonable cost.  Can't afford a commercial unit?  Including the 
$99 things Radio Shack used to sell?  I think I saw those discounted
a month or two ago, to $35.

		John Whitmore