Nice. @Antbug, maybe put in an area that just gets a little sunlight for a few hours a day and is in shade the rest?
I'm contemplating an Arduino controlled moisture sensor for my Elm, because I know that without one my neighbor will kill it. I was hoping that my Anatomy and Physiology teacher would be able to care for it (he's got like 30 trees, most of which are older than me! lol) but he will also be out of town that week :/
Besides, what else do I have to do on a Monday afternoon, coughing and wheezing. lol.
Planning to have a simple, 2-LED device (one red, one green) and two calibration buttons. Or maybe one. If two, it'll be one for calibrating/setting the dry value and storing it to compare against, and then one for the saturated value. But come to think of it I think there'll just be one button. When the soil is dry, the red LED will light up, and when it's wet/sufficient, the green LED will light up. Then again, I may just use one LED to conserve battery life in this case.
But then I may have to take into account that the tree needs some period of time dry. So then I could compare to the dry value, and then set a timer when it is dry, then wait X amount of time to put the LED on, so that way it would have that period to dry out.
Any suggestions to add, if you've read this far? lol.
"Simplicity is the ultimate sophistication." -- Steve Jobs