RTC & WatchDog HAT for Raspberry Pi, Auto Reset, DS3231SN High Precision RTC, MAX705
Make: WaveShare Electronics Co.
SKU: 2525
Availability: OUT OF STOCK

₹971.14 inc. GST
Ex GST: ₹823.00

Additional Info
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  • RTC WatchDog HAT

    • MAX705 monitoring circuit with auto reset function
    • Incorporates DS3231SN high precision RTC chip, with backup battery holder
    • Reset pin selection for swiching watchdog
    • Indicator for watchdog output warning


    Demo codes

    How to use


    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
    C examples
    cd ~/RTC_WatchDog_HAT/RTC/c/
    make clean
    sudo ./main
    RTC WatchDog HAT 1.png
    Python example
    cd ~/RTC_WatchDog_HAT/RTC/python/examples/
    sudo python main.py


    RTC WatchDog HAT 2.png


    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
    R is default 5.1M, and C is default 44uF
    Tge default delay time is 157.08s ±6%

    RC are set in the board:


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