Raspberry Pi RTC WatchDog HAT spotpear

Introduction

RTC WatchDog HAT For Raspberry Pi, Auto Reset, High Precision RTC

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

How to use

RTC

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
make 
sudo ./main

Python example

cd ~/RTC_WatchDog_HAT/RTC/python/examples/
sudo python main.py

WatchDog

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:

Documentation

Demo codes

Demo Codes

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com

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Raspberry Pi RTC WatchDog HAT