Abstract
In this chapter more input and output user interfaces are discussed. In earlier chapters, for user interface UART terminal on host PC and switches were used. So, this chapter will discuss a bit more complex interfaces like 16\(\times \)2 LCD, 16 key keypad and PS/2 based keyboard. LCD and 16 key Keypad are driven using serial shift registers. So, that both of these can be controlled by using just the 5 GPIO’s. Having, such interfaces helps in developing standalone projects, as the user may not need to use host terminal to display messages and for user input. The user can display the messages on LCD and give input using 16 key keypad or PS/2 keyboard.
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