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Barcode Readers

A Barcode reader is an electronic device for reading printed barcodes.

A Barcode reader consists of –

  • A light source.
  • A lens and a light sensor.
  • Decoder circuit.

How Barcode Reader works?

  1. Data retrieval is achieved when bar code scanners shine a light at a bar code, capture the reflected light and replace the black and white bars with binary digital signals.
  2. Reflections are strong in white areas and weak in black areas. A sensor receives reflections to obtain analog waveforms.
  3. The analog signal is converted into a digital signal by a Analog to Digital (A/D) converter.
  4. In the decoding process, data retrieval is achieved when a code system is determined from the digital signal obtained.