Date   : Wed, 22 Aug 2007 18:49:43 +0200
From   : eelco@... (Eelco Huininga)
Subject: [BBC Micro] Barcode Scanner

I've finished the schematics for the bar code reader. I've put it online
at http://acorn.huininga.nl/pub/docs/circuit%20diagrams/Perhiperals/Acorn%20User%20Bar%20Code%20Reader.jpg

Cheers,
Eelco

Eelco Huininga wrote:
> Peter Craven wrote:
> 
>> Recently reading a BBC ROM book that include barcodes of the programs in 
>> the back. Remember Acorn User magazine also uesd these.
>>  
>> Does anyone know how to make such a scanner??
> 
> The barcode scanner came with a bundle sold by Acorn User, named "The 
Barcode Reader Project". I don't think the reader was ever released as a 
DIY project, but it's a pretty simple device. I've just dug out my reader, 
and I can tell that it's nothing more than an infrared tx-LED, an infrared 
rx-LED , an opamp (LM324)and a voltage converter (ICL7660). I've just put 
a photo online at http://acorn.huininga.nl/pub/media/photo/Acorn%20User%20Barcode%20Reader%20Project/Barcode%20Reader.jpg
(2.2MB). As you can see, the PCB is nothing fancy, so I should be able to
reverse engineer a schematic from it.
> 
> There's a short length of glassfiber glued on each LED with what looks 
like ordinary epoxy glue. The ends of the glassfibers are fed into a small
metal tube, which comes out in the 'nose' of the reader. I think it should
be pretty easy to create one at home.
> 
> I'll work out the schematics within the next couple of days.
> 
> Cheers,
> Eelco
> 
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