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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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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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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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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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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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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Hardware watchdog for my ESP32 Board - circuit and design suggestion

i've made my custom board based on LM2596, LM1117, ESP32 with ethernet based on LAN8720. This works without any issue but i want to prevent any type of software issues/hangs using an external watchdog ...
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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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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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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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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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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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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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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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