Frequently Asked Questions


A barcode is a graphic identifier used to express a set of information by arranging multiple black bars and blanks with different widths according to certain coding rules. A common barcode is a pattern of parallel lines formed by black bars (referred to as bars) and white bars (referred to as spaces) with greatly different reflectivities. Barcodes can mark the country of origin, manufacturer, commodity name, date of manufacture, book classification number, starting and ending location, category, date, etc. 
Usually barcode scanner modules has TTL interface, if you use the arduino or raspberry pi to control the barcode scanner module, you shoud make sure the TTL 12Pins connect to the board correctly
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