tiny linear actuator
I’ve got one running a small vent on my 3D printer enclosure and it’s been solid for about 8 months now. It opens and closes every print session, no hiccups so far. For your setup, I’d check out this tiny linear actuator https://www.progressiveautomations.com/pages/micro-linear-actuators — they have low-current draw options that are great for continuous use. Just make sure it’s protected from moisture if your greenhouse gets really humid.
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I love seeing how people use these small components in DIY projects. The cool thing is how easy it’s gotten to automate stuff on a tiny scale without spending a fortune. It used to be that compact meant “fragile,” but now these parts can handle real use if you set them up right.