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.

1
vote
1answer
85 views

5V digital output to 24V

I'm sure it is a simple solution but I am new to this so please take it easy. I need to come up with something to convert a 5V digital output signal from a USB-1608G DAQ device with DIO to 24V ...
0
votes
0answers
25 views

Using ESP32 and external WatchDog STWD100NYWY3F

I want to use ESP32 with the STWD100NYWY3F external watchdog timer. Below is my connection diagram. On WDI with 33 pin, periodic pulses are sent to the watchdog timer. If the timer is not reset, then ...
0
votes
0answers
41 views

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 ...
1
vote
1answer
70 views

PIC16F884 keeps resetting even though WDT should be off

I just bought a PIC16F884 and put a simple C program on it using MPLAB: ...
0
votes
1answer
26 views

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 ...
1
vote
0answers
43 views

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 ...
0
votes
1answer
40 views

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 ...
2
votes
1answer
68 views

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....
0
votes
0answers
160 views

Watchdog on Attiny13 every 2 minute

I am trying to use a watchdog on Attiny13. With this code I get 70-100sec (it is not constant) sleeping time and 8sec wake up (pull X pin high) time: ...
0
votes
1answer
105 views

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....
1
vote
1answer
67 views

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 ...
2
votes
1answer
53 views

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 ...
19
votes
7answers
3k views

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 ...
1
vote
1answer
53 views

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 ...
3
votes
2answers
469 views

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 ...
0
votes
1answer
209 views

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 ...
0
votes
1answer
49 views

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 ...
0
votes
2answers
390 views

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. ...
0
votes
4answers
881 views

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 ...
0
votes
1answer
36 views

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..
0
votes
0answers
200 views

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 ...
3
votes
2answers
171 views

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 ...
0
votes
1answer
127 views

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... ...
-1
votes
1answer
132 views

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 ...
0
votes
1answer
466 views

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: ...
0
votes
2answers
162 views

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 ...
1
vote
2answers
4k views

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, ...
0
votes
0answers
57 views

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 ...
0
votes
1answer
75 views

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 ...
1
vote
0answers
548 views

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 ...
0
votes
1answer
87 views

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 ...
1
vote
1answer
293 views

Watchdog to stop power supply

I want to stop supplying power for a short moment if a watchdog has not received a reset order for a while. Shutting down power is important as this is the only way for some buggy device to function ...
2
votes
1answer
514 views

Atmega328P Watch Dog Timer - Delay Issue

I am trying to give delay of 0.5 seconds on 13 pin of the arduino using Watch Dog timer interrupt, the code complies and works fine but the led is blinking so rapidly that it seems like it is ...
1
vote
2answers
217 views

Turning-off Watchdog Timer

Under severe power constraints I'm considering disabling the watchdog.The MCU is to work as a stepper motor controller in a watch and drive a simple bar display too. What can the consequences be? (...
4
votes
2answers
2k views

STM32F4: WWDG interrupt fires as soon as it's enabled

I'm doing some coding on an STM32F411 board, used the CubeMX & HAL Libraries for laziness. I'm trying to get the windowed watchdog (WWDG) up & running, and doing the very basic version (non ...
5
votes
2answers
3k views

Does the internal 8Mhz oscillator in an ATTINY run even if no clocks are connected to it?

If I set up the fuses on an ATTINY so that the system clock uses the internal 128Khz oscillator (sometimes called the "Watchdog oscillator"), does the internal 8Mhz oscillator still run? It does not ...
0
votes
1answer
261 views

How to controll windowed watchdog (WWDG) with dynamically scaling CPU frequencies?

I have a project using ARM Cortex M4 with scaling CPU frequencies dependent on the workload. I would like to use the WWDG because it allows a lot more options like interrupt on watchdog. Question is: ...
0
votes
1answer
247 views

Using Energia, how do I get around disableWatchDog() locking up my program?

Below is a short code chunk. The code locks up on the 'Serial.Begin(9600);' line. Can anybody tell me why? Also, can you tell me how to get around it? ...
0
votes
1answer
751 views

Detecting hardware watchdog reboot on bootup

The CPU on my embedded linux system (Armada 370) does have a hardware watchdog. It does not appear to have any way of checking at bootup time whether the bootup is a normal cold boot or a reset from ...
5
votes
2answers
3k views

Windowed watchdog timer

Can someone please explain how windowed watchdog timer is different from the normal watchdog timer? When is windowed watchdog timer prefferred over normal watchdog timer?
1
vote
2answers
550 views

Is it possible to implement a fail-proof watchdog timer in software?

I want to add a piece of code for watchdog timer within my source code so that the board resets automatically when programs hangs. I am using Mediatek Linkit One board.
1
vote
2answers
685 views

AC Watchdog Circuit

I've designed a small AC-based watchdog circuit for my Raspberry Pi (schematic below). A buddy of mine looked at it and said that it was complicated, and there might be problems with asymmetric ...
0
votes
2answers
2k views

AVR Watchdog interrupt mode and reset mode

I am going through datasheet of AVR2560V. In page 65 , table 12-1, it says that AVR2560 has 3 mode for watchdog Interrupt mode - WDE = 0, WDIE = 1 ...
2
votes
1answer
638 views

How do I wake from sleep on PIC10F200 via watchdog?

So far I have worked with many other micro controllers but not the PIC-family. I'm having trouble with waking from sleep via watchdog on a PIC10F200. I'm programming it in C using the MPLAB X IDE v2....
1
vote
4answers
680 views

Read AVR watchdog timer

AVR Watchdog timers. Is there any way to read the watchdog timer from within the code? Intended use case: To get an approximate idea (very rough, +/- 1sec) of how long it has been since the ...
2
votes
1answer
2k views

Understanding PIC32 watchdog timer operation

I'm new to uC development and have been fooling around with the PIC series for about 6 months now. I recently started working with the PIC32 and Microchip's XC32 C++ compiler. I don't know if I have a ...
1
vote
1answer
104 views

MSP430G2553 WDT ISR compilation error - GNU v4.9.1

I'm using GNU v4.9.1 compiler, and I'm just trying to work with WDT timer: void __attribute__((interrupt(WDT_VECTOR))) WDT_ISR(void) { P2OUT ^= BIT1; } When ...
32
votes
1answer
7k views

Why does my AVR reset when I call wdt_disable() to try to turn the watchdog timer off?

I am having a problem where executing a disable watchdog sequence on an AVR ATtiny84A is actually resetting the chip even though the timer should have plenty of time left on it. This happens ...
4
votes
2answers
154 views

Low power strategy for dealing with spontainious bit flips durring sleep on AVR 8-bit?

I am designing a ATTINY-based circuit that is intended to run unattended for very long periods of time on a very small battery. The device spends almost all of its time in deep sleep, and only wakes ...
5
votes
4answers
496 views

How often do AVR's actually glitch and need a watch-dog reset in the real-world?

Have you ever seen an otherwise happy AVR spontaneously glitch and require a reset? Assuming: a nice stead power supply that stays inside the specified range a correctly sized decoupling cap ...