barcode tutorial

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Actually, a bar code works in much the same way as an ordinary flashlight -by reading the reflected light from a surface. The process begins when a device directs a light beam through a bar code. The device contains a small sensory reading element. This sensor detects the light being reflected back from the bar code, and converts light energy into electrical energy. The result barcode is an electrical signal that can be converted into data. Bar codes are measured by the width of the narrow bar and are recorded in mils, or 1/1000 inch. A 15 Mill bar code, for instance, has tutorial a narrow bar that barcode is 15/1000 inches wide. Further, tutorial "quiet zones," or blank spaces to the left and right of bar code symbols, are included barcode to insure tutorial the bar barcode code can tutorial be read. It''s a three-step process. First, an input device must convert light barcode energy into electrical tutorial energy. There barcode are a variety of tutorial input devices, each with its own unique characteristics.