Computing > Embedded Computing

Reliable Embedded CPU

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gnuarm:
I have an AC power switch to control various devices and would like to use a few more, but they seem to be other than 100% reliable.  The one I'm using does on occasion seem to lose it's clock setting or something, so that it mucks up the times it's supposed to turn on and off.  The UI is not bad, but it gives no visibility into figuring out what might be wrong.  So I'm thinking of rolling my own. 

I would prefer to use an off the shelf device like an rPi or ESPxxxx or similar, but I have no idea how robust they are.  I don't want to jump from the frying pan into the fire.  Anyone have enough experience to say which embedded unit with wifi would be reliable enough to run for a year or two without getting bollixed up?  It doesn't need a battery backup, but does need some form of non-volatile storage for the settings.  I guess I would be concerned about an SD card being messed up on power failures. 

The nice thing about the power switch I'm using is the power measurement, although I've never measured the accuracy of it.  I've got a Fluke power meter.  I should calibrate it sometime.  I might take it apart to check out the design.

brucehoult:
I don't understand what you're asking for.

A Raspberry Pi is not a power switch.

What do you need WIFI for? I don't think I'd trust any WIFI or BlueTooth stack to be bug-free. Ethernet, maybe.

If you need reliable then the simpler the better.

Reliability can to some extent be increased by a regular program of rebooting or, better, power cycling.

The hardware is almost never the problem.

oPossum:
https://sonoff.tech/

gnuarm:

--- Quote from: brucehoult on April 27, 2021, 12:36:11 pm ---I don't understand what you're asking for.

A Raspberry Pi is not a power switch.

What do you need WIFI for? I don't think I'd trust any WIFI or BlueTooth stack to be bug-free. Ethernet, maybe.

If you need reliable then the simpler the better.

Reliability can to some extent be increased by a regular program of rebooting or, better, power cycling.

The hardware is almost never the problem.

--- End quote ---

Yes, I don't expect the hardware is the problem, but that is not certain.  A device that plugs into a wall outlet must be tolerant of power spikes as well as simply working 100%.  There's no small percentage of low cost, embedded devices that simply don't stay running any better than a Windows 95 computer simply because the hardware is not 100%.

This is the sort of thing I'm looking to replace.

https://www.amazon.com/s?i=tools&k=Wi-Fi%20Smart%20Plug&ref=nb_sb_noss_2&url=search-alias%3Dtools

gnuarm:

--- Quote from: oPossum on April 27, 2021, 12:39:22 pm ---https://sonoff.tech/

--- End quote ---

Interesting.  I wasn't looking to hard wire it in, but that's an option.

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