BarcodeScanner

A barcode scanner, or barcode reader, is a device that reads printed barcodes and converts the pattern into a digital signal to be used by a computer or software system. Barcodes encode data such as product identifiers, batch numbers, or location data.

Most scanners work by illuminating the barcode with a light source and detecting the reflected light with a photodetector. The scanner then decodes the pattern using software and sends the resulting data to a host device via an interface.

There are two main families: laser scanners, which use a rotating or oscillating laser to read 1D barcodes, and image-based imagers, which capture a barcode image with a camera and decode 1D or 2D codes such as QR codes and Data Matrix.

Form factors include handheld units, presentation scanners, and fixed-mount or wearable devices. Output interfaces include USB, Bluetooth, and Wi‑Fi connections, as well as keyboard wedge or serial interfaces to integrate with point-of-sale systems and inventory software.

Common applications include retail checkout, warehouse and stock control, asset tracking, library catalogs, healthcare patient records, and mailroom processing. Barcodes are used for fast, contactless data capture and to reduce data-entry errors.

Readability depends on barcode quality, contrast, print size and distance. 1D codes require clear, high-contrast lines, while 2D codes tolerate larger error and distortion. Poor printing, damage, or glare can prevent decoding.