How Does a Barcode Reader Work? A Complete Guide Introduction A barcode reader is a device that scans barcodes and converts them into digital data. This digital data is then sent to a computer or software system for processing. Barcode readers are widely used in retail, logistics, and healthcare for fast and accurate data entry. Basic Working Principle of a Barcode Reader A barcode reader works by shining a beam of light—usually a red LED or laser—on a barcode. It then measures the light that bounces back. Black bars absorb more light, while white spaces reflect it. The scanner detects this contrast and converts it into electrical signals. A decoder processes the signals and turns them into digital information. Main Components of a Barcode Reader 1. Light Source This part illuminates the barcode. Most readers use red LED or laser beams. The light helps highlight the barcode’s pattern. 2. Lens or Sensor The sensor captures the light that bounces off the barcode. It reads...