A barcode scanner is a device that utilizes a scanner composed of a lightsource, lens, and light sensor to read and translate information that barcodes contain. A barcode scanner's function is simple and relatively easy to understand. It measures the amount of light that is being reflected when a code is scanned by a beam of light produced by the barcode scanner. The reason for measuring the amount of light that is reflected while using a scanner is that the black bars making up a barcode reflect less light than the white spaces accompanying them. After this, the scanner automatically converts observed light energy into electrical energy. From here, a decoder within the scanner comes into action by converting collected electrical energy into data before forwarding it to a computer.

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Transmitters and receivers have evolved over the decades to make sending and receiving data easier. This is due to the evolution of electronic devices transitioning to the use of wireless equipment, as compared to employing traditional wired hardware. While traditional wired devices may have the fuss of figuring out which terminal to plug your device into, alongside the maneuvering of tangled cords, wireless devices have no cords, making them easy to deal with. For example, when a device is transmitting audio information to a connected speaker via bluetooth transmission to produce audible noise, this is all achieved through the use of a transmitter and receiver exchanging and transforming signals.

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