Questions tagged [watchdog]

An independent timer module usually incorporated into the same chip as a uProcessor which resets the processor after a certain length of time. The idea is that during usual operation the code running should always be able to reset the watchdog timer before the watchdog resets the processor. If the processor gets into a bad state or the code is corrupted it will not reset the watchdog and in turn will be reset back to normal operation.

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Arduino Watchdog Power Cycle Circuit

I'm looking at building a watchdog that will power cycle my arduino (weather station) when it is not responding (my arduino gets a CMOS lockup and doesn't respond to reset). I've read about designs ...
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Watchdog timer circuit without continual re-trigger

The STWD100 is a watchdog timer, if a pulse from a microprocessor isn't received in X amount of time, it pulls it's output low. This is useful to detect if a processor has experienced an upset (...
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Resettable timer with opamp

I need to make a circuit with an opamp and passive components that has those constraints : When it receives a pulse on one input, its output should be high. After a predefined duration T, it should ...
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What IC is marked WDG273?

I want to buy this USB watchdog V5.0 in order to restart my computer in case the PC hangs. As I'm an electronic designer, I was checking the hardware and when I saw the main IC reference, I said: &...
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What options are there for a slow hardware watchdog monitoring an embedded HTTP client?

I'm trying to build a server health monitoring device around an ESP8266 module. The module will contain an embedded HTTP client that will contact a set of servers to check their responsiveness. The ...
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Using a watchdog in low power application?

Most low-power applications operate in burst mode, where the system is asleep most of the time. I don't understand how to use a watchdog (WD) in those kinds of systems. The perfect scenario would be ...
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Supervisory watchdog to assure UV LEDs are off and stay off during non-use

I'm designing a circuit consisting of 3 pairs of LEDs. Each pair has one UV-LED and a white LED. The pairs will be turned on consecutively and for about 1 second each. Between each use there will be ...
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Use attiny as an external watchout timer

I like to failsafe an Atmega8 mcu despite having its own WDT. does it make sense that if I add an attiny to the circuit to check if each loop is taking a specific time, if not reset the Atmega chip?
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ATmega48PB: wdt in interrupt mode still reset the MCU

I read the datasheet and this question, but there's still something wrong here. Here my wdt init code: ...
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Continuous Reset generated by LDO to Microcontroller

I have the below schematic Datasheet of the LDO - L4995 -SSO24 package LDO Specification : Input Voltage : 12-16V Output Voltage : 5V Load Current : 100mA Issue : My LDO is generating RESET ...
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STM32 external voltage monitor / watchdog - worth it?

I'm building a device that will have STM32F750, and now thinking about stability in case if power or software will misbehave. As per topic - is it worth it to have an external voltage monitor and ...
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STM32F4 Independent Watchdog (IWDG) not triggering as expected

Im trying to understand how Independent watchdog really works and i wrote a piece of code that runs on STM32F411VE Eval board. I believe i have configured the Watchdog Timer correctly according to ...
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Initialize IWDG with two difference handles

I am implementing a watchdog in my project, where i am using a IWDG in STM32F4 series controller. I am trying to initialize the watchdog twice with different handles, since it is implemented in two ...
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Keyed access in PIC config settings for the WWDT

I'm playing around with the settings for the windowed watch dog timer (WWDT) for the PIC18F24K40. In chapter 3.7.3 (page 37) about device configuration, the DT Window Select bits are briefly ...
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AVR ATtiny1634 - PB3 as Input and Watchdog Timer

I'm quite a beginner in AVRs and this is my first project soldering the microcontroller and programming it on board. I know the ATtiny1634 QFN might not me the best micro for a beginner, but ...
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Can the watchdog on an STM32F373 trigger a reset while the RESET pin is held high?

The reset pin on an STM32 chip is being pulled high by a Raspberry Pi Zero W in the field via GPIO pin BCM 17. Will the watchdog on the STM32 be capable of triggering a reset while the pin is being ...
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Connection diagram of external WatchDog timer MAX6369KA+T and Arduino

Tasks: Ensure a reliable reboot of the microcontroller in case of a hang. The ability to disable the WDT timer. For these purposes, I found an external watchdog timer MAX6369KA+T. Scheme: Logic: ...
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How should a watchdog timer be used? [closed]

I've seen and written programs in which the internal watchdog just resets in a super loop and trigers only when something goes wrong and forces the whole system to crash. I've also seen it can be ...
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STM32L0 IWDG > 32s

I need to implement a feature similar to that provided by the IWDG on the STM32L073RZ. The issue I'm facing is that the maximum timeout value of the IWDG is ~ 32 seconds - I need something that can ...
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How to enable PIC16 watchdog timer for software control?

I am working on a project where I have an I2C slave application running on a PIC16F1829. I am finding that because the ISR must read the slave address, wait for a new byte, then read that byte, that ...
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Watchdog with long on and off periods for microcontroller [closed]

I have a microcontroller (Arduino-like IoT device) and would like to connect a low power external hardware watchdog to be able to recover from failures. I know that a software watchdog is already ...
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5V digital output to 24V

I need to come up with something to convert a 5V digital output signal from a USB-1608G DAQ device with DIO to 24V digital output signal to reset the timer on a watchdog. The watchdog timer will only ...
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Cannot Disable AVR ATmega32 Watchdog

I'm writing a code to enable and disable the watchdog timer in ATmega32. I'm using the function in the datasheet that disables the wdt. Also, I'm toggling led in the beginning of the code to know if ...
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PIC16F884 keeps resetting even though WDT should be off

I just bought a PIC16F884 and put a simple C program on it using MPLAB: ...
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Is 128KHz oscillator in ATmega same as Watch Dog Oscillator?

Where is the 128KHz oscillator located in ATmega328p? I am unable to find it on the ATmel data sheet ,Is it same as watch dog timer Oscillator? I am attaching the clock section from the ATmel ...
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IoT wireless solenoid circuit

I am a Newbie and I do not have a lot of expirience. The circuit has been put together from pieces I have found on the internet. My goal is to develop a reliable wireless solenoid circuit to water my ...
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MSP microcontroller Watchdog timer

I am new to programming microcontroller. what does the following like of code do: WDT_A->CTL = WDT_A_CTL_PW | WDT_A_CTL_HOLD i have looked at the technical ...
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Way to reset an MCU when it's GPIO output becomes constant HIGH or LOW instead of a low frequency PWM

In one of our projects, we are observing MCU hanging up supposedly due to EFT. WDT is not helping. The only way to get the device into working condition is to reset the MCU by reset pin or power cycle....
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I can't get WDT (watchdog timer) working on ATmega2560

I have a running application on the ATmega2560 and it is working OK. Now, I wanted to implement Watchdog feature in order to reset the chip when the application takes longer to operate for some reason....
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How to burn bootloader to ATmega 2560 using Atmel Studio and AVRISP mkII?

Although my question might come familiar to many Arduino developer including me, but, I am somehow lost burning bootloader to ATmega 2560. Many comments I found were related to AVRDude (never used ...
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Preventing inadvertent feeding of an external watchdog

Most internal watchdog timers found on microcontrollers contain mechanisms to prevent an inadvertent feed, usually requiring the write of a specific key-value to the feed register, although some ...
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7 answers
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Necessity of an external watchdog timer

What is the need for an external watchdog timer for a microcontroller? Most of the microcontrollers are designed with an internal watchdog timer. However, in some of the circuits they are using an ...
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What's the name of a timeout relay which won't re-trigger if it times out?

I would like to replace the relay which triggers a water pump, with a relay which times out after, say, 10 minutes. And if it times out, it stays locked out until reset. Needs to be 230v AC on both ...
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3 votes
3 answers
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How to test a CPU watchdog on board?

The watchdog of an ATMEL ATXMega128 should have been enabled with fuses. It triggers a reset, if the timer was not reset within the configured time span. I want to be sure, that it is enabled and ...
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External Watchdog Timer

I am using TPL5010 http://www.ti.com/lit/ds/symlink/tpl5010.pdf watchdog timer's RSTn pulse to trigger 555 timer in monostable mode with 10 sec pulse width in order to turn ON relay using transistor ...
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MSP430FR6989 Watch Dog Timer

I am trying to learning about the Watch Dog Timer peripheral of MSP430FR6989 (link to MSP430). It's Watch Dog Timer peripheral WDT_A have a 16 bit control register (WDTCTL), in order to perform a ...
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Looking for external watchdog chip for Raspberry Pi 3 model B board

I'm working on a project that has chosen an RPi3 model B board as part of the system. We previously had an external watchdog system that would cut the entire system power if the watchdog expired. ...
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Arduino watchdog with 555 Timer and a MOSFET

I want to protect an Arduino from stop running using a 555 timer. I saw some projects that use the Arduino RESET pin to do that but there are cases that my Arduino project still stop working even when ...
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Reading part number

Can someone please guide me reading the part number? The screenshots are from a datasheet of a watchdog (STWD100). I don't know how to relate these two..
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How to change PIC watch dog expiration duration in run time?

In one of my application using PIC18F25K20, I set the Watchdog Timer Postscale Select bits as following for the CONFIG2H register at the beginning of the c code under configuration bits. pragma config ...
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3 votes
2 answers
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Extend the time delay of an asserted WDT active low

I am new to electronics and would appreciate any help. I am trying to design a watchdog timer circuit using the TI WDT (mfg part # TPS3813K33DBVT). I am using it to reset an Arduino (I wish to use an ...
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Why am I getting the error: "`WDRT' was not declared in this scope" trying to turn of the WDT on my AVR?

I am clearing the Watchdog System Reset Flag on my ATMEGA168 after a WDT reset... ...using the code... MCUSR &= ~_BV(WDRT); ...but the compiler complains... ...
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How to reset microcontroller after X amount of hours/seconds? [closed]

I know there are similar posts to this I am just looking to see if there are any new more efficient solutions. I have a MCU and I am looking to add a circuit in between the power supply and the MCU ...
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atmega328p watchdog keeps restarting

I have AVR Atmega328p which I want to blink for 5 secs every 16 secs (to test the watchdog interrupts). I have the following code, which keeps restarting, and the last line is: ...
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using exit(EXIT_SUCCESS) or exit(EXIT_FAILURE) in AVR or any other microcontroller

How does one use exit(EXIT_SUCCESS) or exit(EXIT_FAILURE) in microcontroller C programming. I know it works on application ...
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How to stop/reset the watchdog timer from low-power sleep mode on an STM32L0C8?

On an STM32L0C8 MCU, I have the watchdog enabled while executing. At certain points in execution, I would like the chip to go into low power sleep mode. When it goes into low-power sleep mode though, ...
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Patterns for using watchdog and ultra low-power constraints

I am designing a power-constrained device that has to gather some data, run from a battery for a couple of years and send data periodically. I want to ensure high reliability, because the device will ...
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Using external watchdog with NXP MK64 CPU

I'm using external watchdog timer in my board to reset the MK64 in case no strobe is passed to it (I know there's also internal watchdog in the MK64). What I don't understand is what should happen ...
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watchdog timer on PLC

I've currently set my PLC as a modbus slave, and written some python code which connect to it and act as a modbus client. I am having some problems with the modbus server sometime terminating the ...
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Recovering from run time errors on stm32l0

I have the independent watch dog running and I get rare resets for unknown reasons. How can I catch these errors and do a controlled reset. I want to store some things in EEPROM and then restart the ...
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