Enabling WDT MCU reset functionality with lowpower library

[rocketman]

Many thanks for this great library.

I’m using it with a solar panel powered pump controller with a ATMEGA328P UP on a proto board running with 8MHz internal clock source.

I want to enable the WDT to trigger a reset if the MCU hangs due to low solar power
Two questions:
1. how to enable WDT reset functionality when using lowpower library
2. will the WD trigger a reset when inside powerDown function?

In brief this is the loop:
loop() {
// pump control code
WDT reset if pump control code doesn’t complete in time
// sleep – will the WD trigger a reset when inside powerDown function?
LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_ON);
}
Thanks in advance for any pointers on this.

[LIM PHANG MOH]

The SLEEP_1S uses the WDT as a timer to wake up. When used as timer, the WDT cannot be used to reset the MCU when it hangs. The only way to do this is to SLEEP_FOREVER but uses other mechanism to wake up (example: external RTC) and but uses the WDT to reset instead.

[rocketman]

Thank you Lim Phang Moh for your clarification. I don’t have an external pulse to wake up from SLEEP_FOREVER – Could that be done with one of the inbuilt timers instead?

[Author]

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