External watchdog board for Pycom

[Milan]

Hi,

I'm interested in implementing external watchdog board along with Pycom. I wound one for Arduino and RaspberryPi, here is link to that board: https://shop.switchdoc.com/products/switchdoc-labs-dual-watchdog-timer-board-for-arduino-raspberry-pi?variant=3340467699742

What is best external watchdog on market for connection with Pycom?

Thank you in advance.

[Milan]

@timh I've already implemented internal watchdog but it doesn't help in case of Guru Meditation Error.

@Martinnn You and I have the same problem. Thank you for suggestion, as I can see this watchdog times is not in a form of a development board like this one: https://shop.switchdoc.com/products/switchdoc-labs-dual-watchdog-timer-board-for-arduino-raspberry-pi?variant=3340467699742. Am I right?

Thank in advance.

[Martinnn]

@timh No, it isn't. The internal watchdog doesn't catch "guru meditation" errors, which happens (on my devices) from time to time. I'll make a board around a maxim watchdog - select one from there https://www.maximintegrated.com/en/products/power/supervisors-voltage-monitors-sequencers/watchdog-timers.html (and keep clear of TDFN packages if you are not a soldering pro).

[timh]

@milan I have found the internal watchdog has been reliable for me. Have you explored that yet ?

[Milan]

@robert-hh I don't have any experience with connecting this kind of chip with Pycom and I'm looking for easiest way for watchdog configuration.
That's the reason I'm looking for Watchdog board, something like from link above.

Thank for your answer and time.

[robert-hh]

@milan Looks like it is using a 555 as watchdog, just plain vanilla. You can also use a chip from the MAX637x series, like the MAX6370.
The advantage is: no further external components are required.