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I use it to run my automated watering system in my garden.

https://github.com/davidbanham/relay_runner

I used to use an esp8266 but replaced it with a Pi after a lightning strike destroyed it. The Pi is just so much easier to write software for and it's been no less reliable in practice.

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Why would it be less reliable in theory? The obvious argument against is that it's 'expensive' [relative to what you need], not, I wouldn't have thought, that it's unreliable.

There's a lot more going on with a Pi than an ESP chip. More bits, more failure modes is my reasoning.

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