In certain projects you may want to reset the entire Arduino board - for example if an action doesn't occur after a period of time, as a type of watchdog timer, or for some really GOTO-esque coding. Enthusiast Gabriella Levine has documented two methods of doing just this - the first is by using the RESET pin and a digital output pin. Once the RESET pin is driven low by software using digitalWrite on the output pin, the board resets. The second way is purely in the sketch without any extra hardware or circuitry at all.
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