Input and Output
The simplest input is a switch, with an array of switches forming a numerical keypad input. Timers and interrupts are often used in input processing, such as debouncing. An LED is a simple output indicator, which can be used in a seven-segment display to provide a simple character display. The LCD provides a more versatile alphanumeric output.
Keywords
Switch input; switch interface; LED interface; LED seven-segment display; Liquid Crystal Display (LCD); ASCII codes
Summary
• A simple switch sometimes needs debouncing for correct operation
• Debouncing can be implemented in software or hardware
• The hardware timer and interrupts are often used in input processing
• LEDs can be used as simple indicators or numeric displays ...
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