Electronic devices, including computers and microcontrollers, must often receive the data and commands required for their operation. In computer technology a common input device is the keyboard, which allows for entering text data as well as keystroke orders. Alternate computer input devices are the mouse, trackballs, light pens, graphical tablets, scanners of several designs, speech recognition devices, optical character recognition hardware and software, and many others. Although these devices are not excluded from use in microcontroller-based systems, a more typical case is that microcontroller input devices are much simpler and limited. In this chapter we discuss the two most commonly ...
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