Input devices let data enter a system and output devices present results. This topic covers barcode and QR code scanners, digital cameras, keyboards, microphones, touch screens — resistive, capacitive and infrared — and a range of sensors, along with what each sensor measures and where it is used. Output devices include 2D and 3D printers, actuators, speakers, light projectors and displays such as LCD, LED and OLED. For each device you will learn how it works and what it suits.
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