Mechanical Switches

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Mechanical switches are useful for direct input to digital circuits. One of the more convenient versions is a bank of rocker switches packaged into a module that can fit into the same location as a standard chip. The dual in-line package,
or DIP, switch is one of the easiest ways to add multiple switches to a microcontroller design. The mechanical switch has extremely low "on" resistance and high "off" resistance, unlike most semiconductor switches. Figure bellow shows a typical DIP switch and the schematic symbol for it.