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I think the arduino should be fine by itself... It has a max current output of approx 20mA, and a voltage of 3 or 5 volts or so... I think that should be plenty. The only thing you may want to do is add a current-limiting resistor to your output line in case too much current flows (you don't...

Hey @jeno, glad to hear about your interest in the subject... To answer your question, well... That's the ultimate question. I've seen a few people get great results from using a simple lawn-light solar panel as a power source going directly into the soil. These typically output something...

What are you guys looking to learn? Has anyone tried anything new lately? I'll throw out something new to share... This is a bit old by 10 years or so, but from what I've seen so far, no one in the THC community has been experimenting with this... Has anyone tried to optimize growth using...

I just wanted to say, for anyone who's interested in how this work, I am very interested in this topic and have been studying it for a few years now - it's amazing how it all works! It involves lots of subjects ranging from electrochemistry, plant electrophysiology, geophysics and more...