watchdog – Watchdog Timer

The watchdog module provides support for a Watchdog Timer. This timer will reset the device if it hasn’t been fed after a specified amount of time. This is useful to ensure the board has not crashed or locked up. Note that on some platforms the watchdog timer cannot be disabled once it has been enabled.

The WatchDogTimer is used to restart the system when the application crashes and ends up into a non recoverable state. Once started it cannot be stopped or reconfigured in any way. After enabling, the application must “feed” the watchdog periodically to prevent it from expiring and resetting the system.

Example usage:

from microcontroller import watchdog as w
from watchdog import WatchDogMode
w.timeout=2.5 # Set a timeout of 2.5 seconds
w.mode = WatchDogMode.RAISE
w.feed()

Available on these boards
  • 01Space 0.42 OLED ESP32C3
  • 0xCB Helios
  • 42. Keebs Frood
  • AITHinker ESP32-C3S_Kit
  • AITHinker ESP32-C3S_Kit_2M
  • ARAMCON Badge 2019
  • ARAMCON2 Badge
  • ATMegaZero ESP32-S2
  • Adafruit CLUE nRF52840 Express
  • Adafruit Camera
  • Adafruit Circuit Playground Bluefruit
  • Adafruit EdgeBadge
  • Adafruit Feather Bluefruit Sense
  • Adafruit Feather ESP32 V2
  • Adafruit Feather ESP32-C6 4MB Flash No PSRAM
  • Adafruit Feather ESP32-S2 Reverse TFT
  • Adafruit Feather ESP32-S2 TFT
  • Adafruit Feather ESP32-S3 Reverse TFT
  • Adafruit Feather ESP32-S3 TFT
  • Adafruit Feather ESP32S2
  • Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM
  • Adafruit Feather ESP32S3 No PSRAM
  • Adafruit Feather HUZZAH32
  • Adafruit Feather M4 Express
  • Adafruit Feather RP2040
  • Adafruit Feather RP2040 CAN
  • Adafruit Feather RP2040 DVI
  • Adafruit Feather RP2040 Prop-Maker
  • Adafruit Feather RP2040 RFM
  • Adafruit Feather RP2040 Scorpio
  • Adafruit Feather RP2040 ThinkInk
  • Adafruit Feather RP2040 USB Host
  • Adafruit Feather nRF52840 Express
  • Adafruit Floppsy RP2040
  • Adafruit FunHouse
  • Adafruit Grand Central M4 Express
  • Adafruit HUZZAH32 Breakout
  • Adafruit Hallowing M4 Express
  • Adafruit ItsyBitsy ESP32
  • Adafruit ItsyBitsy M4 Express
  • Adafruit ItsyBitsy RP2040
  • Adafruit ItsyBitsy nRF52840 Express
  • Adafruit KB2040
  • Adafruit LED Glasses Driver nRF52840
  • Adafruit Macropad RP2040
  • Adafruit MagTag
  • Adafruit Matrix Portal M4
  • Adafruit MatrixPortal S3
  • Adafruit Metro ESP32S2
  • Adafruit Metro ESP32S3
  • Adafruit Metro M4 Airlift Lite
  • Adafruit Metro M4 Express
  • Adafruit Metro RP2040
  • Adafruit Metro nRF52840 Express
  • Adafruit Monster M4SK
  • Adafruit PyGamer
  • Adafruit PyPortal
  • Adafruit PyPortal Pynt
  • Adafruit PyPortal Titano
  • Adafruit Pybadge
  • Adafruit QT Py ESP32 PICO
  • Adafruit QT Py ESP32-S3 4MB Flash 2MB PSRAM
  • Adafruit QT Py ESP32-S3 no psram
  • Adafruit QT Py ESP32C3
  • Adafruit QT Py ESP32S2
  • Adafruit QT Py RP2040
  • Adafruit QT2040 Trinkey
  • Adafruit Trellis M4 Express
  • Adafruit-Qualia-S3-RGB666
  • AloriumTech Evo M51
  • Arduino Nano 33 BLE
  • Arduino Nano ESP32
  • Arduino Nano RP2040 Connect
  • Artisense Reference Design RD00
  • AtelierDuMaker nRF52840 Breakout
  • BBQ20KBD
  • BDMICRO VINA-D51
  • BLE-SS dev board Multi Sensor
  • BLING!
  • BLOK
  • BPI-Bit-S2
  • BPI-Leaf-S3
  • BPI-PicoW-S3
  • BastBLE
  • BastWiFi
  • Bee-Data-Logger
  • Bee-Motion-S3
  • Bee-S3
  • BlizzardS3
  • BlueMicro840
  • COSMO-Pico
  • CP32-M4
  • CRCibernetica IdeaBoard
  • Capable Robot Programmable USB Hub
  • Challenger NB RP2040 WiFi
  • Challenger RP2040 LTE
  • Challenger RP2040 LoRa
  • Challenger RP2040 SD/RTC
  • Challenger RP2040 SubGHz
  • Challenger RP2040 WiFi
  • Challenger RP2040 WiFi/BLE
  • CircuitBrains Deluxe
  • ColumbiaDSL-Sensor-Board-V1
  • CrumpS2
  • Cytron EDU PICO W
  • Cytron Maker Feather AIoT S3
  • Cytron Maker Nano RP2040
  • Cytron Maker Pi RP2040
  • Cytron Maker Uno RP2040
  • DFRobot Beetle ESP32-C3
  • DFRobot FireBeetle 2 ESP32-S3
  • Datanoise PicoADK
  • Deneyap Kart
  • Deneyap Kart 1A
  • Deneyap Kart 1A v2
  • Deneyap Kart G
  • Deneyap Mini
  • Deneyap Mini v2
  • DynOSSAT-EDU-OBC
  • E-Fidget
  • ELECFREAKS PICO:ED
  • ES3ink
  • ESP 12k NodeMCU
  • ESP32 Devkit V1
  • ESP32-C3-DevKitM-1
  • ESP32-C6-DevKitC-1-N8
  • ESP32-C6-DevKitM-1
  • ESP32-H2-DevKitM-1
  • ESP32-S2-DevKitC-1-N4
  • ESP32-S2-DevKitC-1-N4R2
  • ESP32-S2-DevKitC-1-N8R2
  • ESP32-S3-Box-2.5
  • ESP32-S3-Box-Lite
  • ESP32-S3-DevKitC-1-N32R8
  • ESP32-S3-DevKitC-1-N8
  • ESP32-S3-DevKitC-1-N8R2
  • ESP32-S3-DevKitC-1-N8R8
  • ESP32-S3-DevKitC-1-N8R8-with-HACKTABLET
  • ESP32-S3-DevKitM-1-N8
  • ESP32-S3-EYE
  • ESP32-S3-USB-OTG-N8
  • Electrolama minik
  • Electronut Labs Blip
  • Electronut Labs Papyr
  • EncoderPad RP2040
  • Espressif ESP32 DevKitc V4 WROOM-32E
  • Espressif ESP32 DevKitc V4 WROVER
  • Espressif ESP32-EYE
  • Espressif ESP32-LyraT
  • Espressif-ESP32-S3-LCD-EV-Board
  • Espruino Bangle.js 2
  • FeatherS2
  • FeatherS2 Neo
  • FeatherS2 PreRelease
  • FeatherS3
  • Fig Pi
  • Flipper Zero Wi-Fi Dev
  • Franzininho WIFI w/Wroom
  • Franzininho WIFI w/Wrover
  • Gravitech Cucumber M
  • Gravitech Cucumber MS
  • Gravitech Cucumber R
  • Gravitech Cucumber RS
  • HEIA-FR Picomo V2
  • HMI-DevKit-1.1
  • Hack Club Sprig
  • Hardkernel Odroid Go
  • Heltec ESP32-S3-WIFI-LoRa-V3
  • HexKyS2
  • HiiBot BlueFi
  • IkigaiSense Vita nRF52840
  • IoTs2
  • Kaluga 1
  • LILYGO T-DECK
  • LILYGO T-DISPLAY
  • LILYGO T-DISPLAY S3 v1.2
  • LILYGO TEMBED ESP32S3
  • LILYGO TTGO T-01C3
  • LILYGO TTGO T-DISPLAY v1.1
  • LILYGO TTGO T-DISPLAY v1.1 4M
  • LILYGO TTGO T-OI PLUS
  • LILYGO TTGO T8 ESP32-S2
  • LILYGO TTGO T8 ESP32-S2 w/Display
  • LOLIN S3 16MB Flash 8MB PSRAM
  • LOLIN S3 MINI 4MB Flash 2MB PSRAM
  • LOLIN S3 PRO 16MB Flash 8MB PSRAM
  • Lilygo T-watch 2020 V3
  • LoC BeR M4 base board
  • Luatos Core-ESP32C3
  • M5 Stack Cardputer
  • M5STACK STAMP-C3
  • M5Stack Atom Echo
  • M5Stack Atom Lite
  • M5Stack Atom Matrix
  • M5Stack Atom U
  • M5Stack AtomS3
  • M5Stack AtomS3 Lite
  • M5Stack AtomS3U
  • M5Stack Core Basic
  • M5Stack Core Fire
  • M5Stack Core2
  • M5Stack Dial
  • M5Stack M5Paper
  • M5Stack Stick C
  • M5Stack Stick C Plus
  • M5Stack Timer Camera X
  • MDBT50Q-DB-40
  • MDBT50Q-RX Dongle
  • MORPHEANS MorphESP-240
  • MagiClick S3 N4R2
  • Maker badge by Czech maker
  • MakerDiary nRF52840 MDK
  • MakerDiary nRF52840 MDK USB Dongle
  • MakerFabs-ESP32-S3-Parallel-TFT-With-Touch-7inch
  • Makerdiary M60 Keyboard
  • Makerdiary Pitaya Go
  • Makerdiary nRF52840 Connect Kit
  • Makerdiary nRF52840 M.2 Developer Kit
  • Maple Computing Elite-Pi
  • Melopero Shake RP2040
  • MicroDev microC3
  • MicroDev microS2
  • Mini SAM M4
  • MixGo CE
  • NanoS3
  • Neuron
  • Oak Dev Tech BREAD2040
  • Oak Dev Tech Cast-Away RP2040
  • Oak Dev Tech PixelWing ESP32S2
  • Open Hardware Summit 2020 Badge
  • Oxocard Artwork
  • Oxocard Connect
  • Oxocard Galaxy
  • Oxocard Science
  • P1AM-200
  • PCA10056 nRF52840-DK
  • PCA10059 nRF52840 Dongle
  • Pajenicko PicoPad
  • Particle Argon
  • Particle Boron
  • Particle Xenon
  • PillBug
  • Pimoroni Badger 2040
  • Pimoroni Badger 2040 W
  • Pimoroni Inky Frame 5.7
  • Pimoroni Inky Frame 7.3
  • Pimoroni Interstate 75
  • Pimoroni Keybow 2040
  • Pimoroni Motor 2040
  • Pimoroni PGA2040
  • Pimoroni Pico DV Base W
  • Pimoroni Pico LiPo (16MB)
  • Pimoroni Pico LiPo (4MB)
  • Pimoroni Pico dv Base
  • Pimoroni PicoSystem
  • Pimoroni Plasma 2040
  • Pimoroni Plasma 2040W
  • Pimoroni Servo 2040
  • Pimoroni Tiny 2040 (2MB)
  • Pimoroni Tiny 2040 (8MB)
  • ProS3
  • PyCubedv04
  • PyCubedv04-MRAM
  • PyCubedv05
  • PyCubedv05-MRAM
  • PyKey 18 Numpad
  • PyKey 44 Ergo
  • PyKey 60
  • PyKey 87 TKL
  • RP2.65-F
  • RP2040 Stamp
  • Raspberry Breadstick
  • Raspberry Pi Pico
  • Raspberry Pi Pico W
  • Robo HAT MM1 M4
  • S2Mini
  • S2Pico
  • SAM32v26
  • SSCI ISP1807 Dev Board
  • SSCI ISP1807 Micro Board
  • Saola 1 w/Wroom
  • Saola 1 w/Wrover
  • Seeed Studio XIAO ESP32C3
  • Seeed XIAO nRF52840 Sense
  • Seeeduino Wio Terminal
  • Seeeduino XIAO RP2040
  • SiLabs xG24 Dev Kit
  • SiLabs xG24 Explorer Kit
  • Silicognition LLC M4-Shim
  • Silicognition LLC RP2040-Shim
  • Simmel
  • SparkFun MicroMod RP2040 Processor
  • SparkFun MicroMod SAMD51 Processor
  • SparkFun MicroMod nRF52840 Processor
  • SparkFun Pro Micro RP2040
  • SparkFun Pro nRF52840 Mini
  • SparkFun Thing Plus - RP2040
  • SparkFun Thing Plus - SAMD51
  • Sparkfun Thing Plus MGM240P
  • Sprite_v2b
  • SuperMini NRF52840
  • TG-Boards' Datalore IP M4
  • TG-Watch
  • TTGO T8 ESP32-S2-WROOM
  • Targett Module Clip w/Wroom
  • Targett Module Clip w/Wrover
  • Teknikio Bluebird
  • The Open Book Feather
  • TinkeringTech ScoutMakes Azul
  • TinyC6
  • TinyPICO
  • TinyPICO Nano
  • TinyS2
  • TinyS3
  • TinyWATCH S3
  • UARTLogger II
  • VCC-GND Studio YD RP2040
  • VCC-GND YD-ESP32-S3 (N16R8)
  • VCC-GND YD-ESP32-S3 (N8R8)
  • W5100S-EVB-Pico
  • W5500-EVB-Pico
  • WSC-1450
  • WarmBit BluePixel nRF52840
  • Waveshare ESP32-S2-Pico
  • Waveshare ESP32-S2-Pico-LCD
  • Waveshare ESP32-S3-Pico
  • Waveshare ESP32-S3-Zero
  • Waveshare RP2040-LCD-0.96
  • Waveshare RP2040-LCD-1.28
  • Waveshare RP2040-Plus (16MB)
  • Waveshare RP2040-Plus (4MB)
  • Waveshare RP2040-TOUCH-LCD-1.28
  • Waveshare RP2040-Tiny
  • Waveshare RP2040-Zero
  • WeAct ESP32-C6 (4MB)
  • WeAct ESP32-C6 (8MB)
  • WeAct Studio Pico
  • WeAct Studio Pico 16MB
  • Wemos Lolin C3 Mini" // from Wemos MP
  • Wemos Lolin C3 Pico" // from Wemos MP
  • Winterbloom Sol
  • WisdPi Ardu2040M
  • WisdPi Tiny RP2040
  • iLabs Challenger 840
  • nanoESP32-S2 w/Wrover
  • nanoESP32-S2 w/Wroom
  • nice!nano
  • nullbits Bit-C PRO
  • senseBox MCU-S2 ESP32S2
  • splitkb.com Liatris
  • takayoshiotake Octave RP2040
  • uGame22

exception watchdog.WatchDogTimeout

Bases: Exception

Exception raised when the watchdog timer is set to WatchDogMode.RAISE and expires.

Example:

import microcontroller
import watchdog
import time

wdt = microcontroller.watchdog
wdt.timeout = 5

while True:
    wdt.mode = watchdog.WatchDogMode.RAISE
    print("Starting loop -- should exit after five seconds")
    try:
        while True:
            time.sleep(10)  # Also works with pass
    except watchdog.WatchDogTimeout as e:
        print("Watchdog expired")
    except Exception as e:
        print("Other exception")

print("Exited loop")

Initialize self. See help(type(self)) for accurate signature.

class watchdog.WatchDogMode

Run state of the watchdog timer.

RAISE: WatchDogMode

Raise an exception when the WatchDogTimer expires.

RESET: WatchDogMode

Reset the system when the WatchDogTimer expires.

class watchdog.WatchDogTimer

Timer that is used to detect code lock ups and automatically reset the microcontroller when one is detected.

A lock up is detected when the watchdog hasn’t been fed after a given duration. So, make sure to call feed within the timeout.

Access the sole instance through microcontroller.watchdog.

timeout: float

The maximum number of seconds that can elapse between calls to feed(). Setting the timeout will also feed the watchdog.

mode: WatchDogMode | None

The current operating mode of the WatchDogTimer watchdog.WatchDogMode or None when the timer is disabled.

Setting a WatchDogMode activates the WatchDog:

from microcontroller import watchdog
from watchdog import WatchDogMode

watchdog.timeout = 5
watchdog.mode = WatchDogMode.RESET

Once set, the WatchDogTimer will perform the specified action if the timer expires.

feed() None

Feed the watchdog timer. This must be called regularly, otherwise the timer will expire. Silently does nothing if the watchdog isn’t active.

deinit() None

Stop the watchdog timer.

Raises:

RuntimeError – if the watchdog timer cannot be disabled on this platform.

Note

This is deprecated in 9.0.0 and will be removed in 10.0.0. Set watchdog mode to None instead.