code bar detector

[hecpavim]

i´m projecting a system to final semester project and i think to use a detector of code bars. However, i don´t know how project this circuit. Please help me!

 

[William At MyBlueRoom]

Do you mean a barcode? Do you want to build a barcode scanner? The circuits are common enough. Even Radio Shack gave a mouse looking barcode scanner away for free some time ago.
What part of your design are you trying to protect? Bury it in black epoxy is one way to protect a circuit.

Here's a link to hacking the CueCat barcode scanner https://www.hackaday.com/entry/1234000427046427/

 

[hecpavim]

you're right! i mean barcode. I wrote wrong. The site have many things but, i don't find what i need. I need to do a barcode scanner to read barcodes of books. You have any idea where i find this??

 

[G8RPI]

Hi,
There are two parts to this,
1/ detect the optical pattern and convert it to an electrical signal
2/ decode the electrical signal into a (ASCII) data stream
Hewlett Packard (now Avago) make a range of detection and decoding components, HEDSxxxx & HBCRxxxx
A good primer is
https://www.avagotech.co.jp/pc/downloadDocument.do?id=4310
See also,

https://www.avagotech.co.jp/pc/downloadDocument.do?id=4612
https://www.avagotech.co.jp/pc/downloadDocument.do?id=4374
https://www.avagotech.co.jp/pc/downloadDocument.do?id=4613
https://www.avagotech.co.jp/pc/downloadDocument.do?id=4615
https://www.avagotech.co.jp/pc/downloadDocument.do?id=4648

These are links to the Avago Japan website but a seach on the main one
https://www.avagotech.com/ will turn stuff up.
You could also use a microprocessor (Pic 8051 etc) to do the decoding.

Robert G8RPI.

 

[phalanx]

How do final year (term, semester, whatever) EE students not know how to start a project? Towards the end of my 2nd year (4 total) of college, I remember implementing pattern recognition using flip-flops and Karnaugh maps as a homework assignment, not a full project.

Has the average curriculum (world-wide) gotten so easy that you don't have to think for yourself anymore?

 

[hecpavim]

the problem isn't the easy curriculum in my case. The problem is the Director of my course that implements this type of final project and don´t give us support to project, either the coordinators of the project. Have another problem too. I study Telecommunications and the course have few topic on design Eletric and Eletronic Circuits. However, i agree with you idea.