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Source data-entry devices are devices that create machine-readable data and feed it directly into the computer without a keyboard or mouse. There are many electronic devices that act as source data-entry such as scanners, cameras, bar-code readers, electronic chips, and audio.
Types of source data-entry devices:
The scanner is an electronic imaging device that uses light-sensing equipment to translate images of text, drawings, and photos into digital form on the computer. The resolution refers to the image’s sharpness and it is measured in dots per inch (dpi). The flatbed scanners work like photocopies in which the image is placed on the glass surface, and then scanned and sent into the computer in form of the image file.
2. Bar-code readers:
Bar-code readers is an electronic devices for reading printed barcodes usually on a product to know their information and their price. It consists of a light source, a lens, and a light sensor that translates optical impulses into an electrical signal. the code type can be in 1D, 2D, or 3D. 1D codes regularly have vertical stripes that can hold up to 16 ASCII characters. 2D is different size rectangles that can hold 1000 to 2000 ASCII characters. 3D is a ‘bumpy’ code that differentiates by symbol height and is commonly used on metal, hard rubber, and other rough surfaces.
3. Radio Frequency Identification (RFID):
RFID works based on an identifying tag bearing a microchip that contains specific code numbers or data. these code numbers are read by the radio waves of a scanner linked to a computer database. active RFID tags have their own power source and can transmit signals over a distance to a reader device. Passive RFID tags have no battery power of their own and must be read by some sort of scanner. The RFID tags of both types are used for a wide range of purposes and are starting to replace bar codes in any situation. The use of RFID is more efficient rather than using bar codes.
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