BAR CODE

Computer Engineering electronics Engineering Civil Engineering

1.1. What is Barcode ? A barcode is an optical machine-readable representation of data, which shows certain data on certain products. Originally, barcodes represented data in the widths (lines) and the spacings of parallel lines, and may be referred to as linear or 1D (1 dimensional) barcodes or symbologies. They also come in patterns of squares, dots, hexagons and other geometric patterns within images termed 2D (2 dimensional) matrix codes or symbologies. Although 2D systems use symbols other than bars, they are generally referred to as barcodes as well. Barcodes can be read by optical scanners called barcode readers, or scanned from an image by special software. 1.2. How It Works? 1. Add together the value of all of the digits in odd positions (digits 1, 3, 5, 7, 9 and 11). 0 + 5 + 7 + 1 + 4 + 2 = 19 2. Multiply that number by 3. 19 * 3 = 57 3. Add together the value of all of the digits in even positions (digits 2, 4, 6, 8 and 10). 7 + 6 + 8 + 6 + 1 = 28 4. Add this sum to the value in step 2. 57 + 28 = 85 5. Take the number in Step 4. To create the check digit, determine the number that, when added to the number in step 4, is a multiple of 10. 85 + 5 = 90 The check digit is therefore 5 loading..