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From: "Philip Pemberton"
Subject: Designing a barcode reader
Date: Sat, 28 Sep 2002 10:47:45 +0100
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I'm currently thinking about building a simple (Code39 only) barcode
reader. Has anyone got some information on suitable methods for detecting
and decoding said barcode? I was thinking about using a high-brightness red
LED to illuminate the barcode. A lens will focus the resulting barcode onto
a phototransistor with a metal sheet wrapped around it with a small pinhole
in the middle. Is this how most barcode wands work, or do they use
fiberoptics to route the light around?
I've pulled a Cuecat to pieces before and I've seen some of
Digitalconvergence's patents (thank you EspaceNet) but I'm still thinking
about how I could decode the data. Would a PIC16F84 RISC MCU running 10MHz
with 64 bytes of RAM be able to do it or will I need some more RAM?
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