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Microcontroller
Based Barcode Decoder |
The
past three decades have seen the introduction of a technology that has radically
changed the way in which we analyze and control the world around us .A by-product
of the microprocessor development was the micro controller. The same types of
fabrication techniques and programming concepts that make possible the general
-purpose microprocessor also yielded the microcontroller.The
microcontroller based Barcode Decoder decodes code 39 .Code 39 was first barcode
symbology to encode alphanumeric data strings .It is for this many industrial
groups accepted this technology for their labeling requirements .It is widely
used as standard for their labeling requirements .It is widely used in variety
of applications.Hewlet- Packard's industrial Digital slot Reader is used here.
HP Barcode decoders provide an excellent scanning performance on a wide range
of bar-coded cards and badges .When a bar coded card is swiped the slot reader
gives a stream of pulses with varying widths .The count corresponding to these
pulses widths are stored in the RAM. These are then decoded by the software, which
is written in the PL/M -51.PL/M-51 is a high level language for programming various
families of microprocessors and microcontroller .The Intel Corporation designed
it .later the stored pulse widths are compared with the character set and the
decoded output is displayed on the Liquid Crystal Display.
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