How Barcode Reader Works: A Simple Guide Introduction A barcode reader is a device used to scan and decode barcodes. It is commonly seen in supermarkets, warehouses, libraries, and hospitals. But have you ever wondered how this device actually works? Let’s explore how a barcode reader performs its job quickly and accurately. What Is a Barcode? A barcode is a pattern made up of black bars and white spaces. Each pattern represents specific numbers or characters. It helps store information such as price, product code, or ID in a compact form. Barcode readers are designed to read this information instantly. How Does a Barcode Reader Work? A barcode reader works through a simple yet effective process. It uses light to scan the barcode and convert it into digital information. Step 1: Scanning the Barcode The barcode reader shines a light—usually a red LED or laser—on the barcode. The black bars absorb light, and the white spaces reflect it. Step 2: Detecting Reflected Light ...