Movable walls - a grow room able to grow. A good idea?

Not the same thing, but have you checked the Sonoff controllers? They are pretty cheap if you are looking for automation. I run a tiny space with LED controlled by a cheap timer and a Sonoff TH16 to measure temp+humidity and control a fan based on the measurements. The Sonoff with sensor was like 13€, the timer probably around 10€ (had it lying around).

There is a thread about a more advanced setup here, I’ve described how I hacked mine (so I don’t use a chinese cloud service) here.

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