I am trying to use a watchdog timer to reset an ATMEGA328P if the software gets stuck for more than 4 seconds. Something does happen after four seconds... the ATMEGA is bricked until the next power cycle. Here is the minimal code that demonstrates the problem, with the wdt_reset uncommented, it out…

Optiboot is the bootloader used on the Uno. It handles the watchdog timer correctly. The Nano bootloader does not. Which, if any, have you installed? If none, then move the two serial statements to the end of setup(). The 4 seconds does not apply after a reset. I think it drops to 16ms and the wat…

ATMEGA328 locks up on watchdog reset

Projects Programming

DrDiettrich November 3, 2021, 5:07am 2

If you want to use the WDT then you have to reset it all the time. If you stop resetting then it will block everything after the watchdog period elapsed.

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ATMEGA328 locks up on watchdog reset

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