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HA-5144 reading printed barcode scanner circuit

2017-08-15 03:05  
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Barcode scanner  is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all barcode readers containdecodercircuitry analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port.The circuit illustrates a method of interfacing a HEDS-1000 emitter-detector pair with a  HA-5144 for use as a bar-code scanner circuit. The HA-5144 is used as an amplifier system which converts the bar and space widths of the printed bar code into a pulse-width modulated digital signal. Amplifier A1 is used to amplify the current output of the detector. The output of A1 is passed to two precision peak-detector circuits which detect the positive and negative peaks of the received signal.Amplifier A4 is used as a comparator whose reference is maintained at the midpoint of the peak-to-peak signal by resistors R5 and R6. This provides a more accurate edge detection and Jess arobiguity in bar width. Amplifier A5 is used as an optional noise gate which only allows data to pass through the gate when the peak-to-peak modulation signal is larger than one diode drop. This circuit is operated by a single supply voltage with low-power consumption which makes it ideal for battery-operated data entry systems.Barcode scanner allows you to read barcodes on products in order to look up prices and reviews. You will also read Data Matrix and QR codes.It scans with back camera of your Android barcodes on products to get the prices and reviews. That way you will compare the prices of the same product in different stores what will help you to find the best match. What's more, you will useful data about each product: movies lenght, synopsis, books sequels, etc. We've noticed that it doesn't find articles sometimes and we guess it's due to those articles are not in Google's database.