I have an ATTiny85 controlling the power to a number of devices. When I first power on it will power the devices via a mosfet. Take the readings it needs to and then puts itself to sleep for 15 minutes then wake up and repeat.
My question is, because I am using the Watchdog timer to put it to sleep, I can't use the reset functionality of the watchdog (ie wdt_Reset). So is there anyway to detect a lock or hang if the ATTiny85 never wakes up for some reason or would I need additional hardware to check for this. If so what kind of circuit would I need.