• sales

    +86-0755-88291180

Raspberry Pi RTC WatchDog HAT

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:


TAG: Raspberry Pi 5 POE + PCIe to M.2 NVMe SSD Board HAT+ Pi5 2242/2230 Power over Ethernet Milk-V Duo Information ADXL354C Evaluation Board Raspberry Pi 0.85inch LCD ESP32 S3 Development Board 1.43 inch AMOLED Display 1.43inch TouchScreen For Arduino LVGL With SD-Port/ QMI8658C 6-Axis Sensor Raspberry Pi 5 PCIe FFC Connector to Standard PCIe x1 Slot (C) Expansion Board MP2.5GD Raspberry Pi 5 PCIe to Dual 2.5G Double Ethernet HAT Pi5 RTL8125 USB Camera 2MP GC2093 ‌WDR Backlight Compensation‌ Onboard microphone X1202 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For 18650-Li-Battery (NOT includ) 4-Ports Luckfox Pico LCD Industrial Isolated Converter Jetson Milk-V Duo Tutorial Computer AI Deepseek Mechanical Voice Keyboard Linux 10x0.85inch LCD Screen Customize keys + 2.01 inch Secondary Display SpotPear Spotpear Raspberry Pi Secondary Screen ESP32 C3 Zero Developer Kit USB TO RS485