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Open a terminal and run the following command to download the codes
wget https://www.waveshare.com/w/upload/b/bd/RTC_WatchDog_HAT.zip zip RTC_WatchDog_HAT.zip sudo chmod 777 -R RTC_WatchDog_HAT cd RTC_WatchDog_HAT/RTC
cd ~/RTC_WatchDog_HAT/RTC/c/ make clean make sudo ./main
cd ~/RTC_WatchDog_HAT/RTC/python/examples/ sudo python main.py
In the WatchDog example, it feeds the watchdog chip if the D4 pin toggle. If the watchdog doesn't be feed in T time, it will cut off the power and the voltage falls to 1.25V, in this case, the MAX705 chip will reset and restart the power. About the time T:
T = 0.7*R*C+1.6s
RC are set in the board: