555 Watchdog Timer Demo
This code demonstrates usage of the 555 watchdog timer described at http://upperbound.com/projects/555-watchdog-timer/
The Serial output helps confirm that the Arduino is sending the heartbeat and being reset when appropriate.
There are two configuration variables:
// The Arduino will send the heartbeat at this output pin. int heartbeatPin = 10;
// Heartbeat will be sent to the 555 timer at this interval, in milliseconds. int heartbeatInterval = 4000;