https://github.com/adafruit/adafruit_sleepydog

Arduino library to use the watchdog timer for system reset and low power sleep.
https://github.com/adafruit/adafruit_sleepydog

arduino-library

Last synced: 2 months ago
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Arduino library to use the watchdog timer for system reset and low power sleep.

• Host: GitHub
• URL: https://github.com/adafruit/adafruit_sleepydog
• Owner: adafruit
• License: mit
• Created: 2015-04-10T01:19:08.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2023-10-20T16:05:39.000Z (about 2 years ago)
• Last Synced: 2025-09-30T06:53:16.608Z (3 months ago)
• Topics: arduino-library
• Language: C++
• Homepage:
• Size: 172 KB
• Stars: 239
• Watchers: 33
• Forks: 72
• Open Issues: 16
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Adafruit SleepyDog Arduino Library [![Build Status](https://github.com/adafruit/Adafruit_SleepyDog/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_SleepyDog/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_SleepyDog/html/index.html)

Arduino library to use the watchdog timer for system reset and low power sleep.

Currently supports the following hardware:

*  Arduino Uno or other ATmega328P-based boards.

*  Arduino Mega or other ATmega2560- or 1280-based boards.

*  Arduino Zero, Adafruit Feather M0 (ATSAMD21).

*  Adafruit Feather M4 (ATSAMD51).

*  Arduino Leonardo or other 32u4-based boards (e.g. Adafruit Feather) WITH CAVEAT: USB Serial connection is clobbered on sleep; if sketch does not require Serial comms, this is not a concern. The example sketches all print to Serial and appear frozen, but the logic does otherwise continue to run. You can restore the USB serial connection after waking up using `USBDevice.attach();` and then reconnect to USB serial from the host machine.

*  Partial support for Teensy 3.X and LC (watchdog, no sleep).

*  ATtiny 24/44/84 and 25/45/85

*  ESP32, ESP32-S2, ESP32-S3

*  ESP8266 WITH CAVEAT: The software and hardware watchdog timers are fixed to specific

intervals and not programmable. Notes about this are within the `utility/WatchdogESP8266.cpp` file.