Ultrasonic thingy it is. Managed to hook an ancient MaxSonic up to a Pi Pico W and get meaningful results, so I'll figure out a way to waterproof everything and still let the squeaks out.
@rogerparkinson I have 05's which don't seem to work at 3V3 but I know a place I can swap some over tomorrow. I may just stick multiple options on the same device. Belt & braces.
@fishidwardrobe
As in an elephant being a milspec mouse? I have been known to slightly over-engineer things sometimes (see Arduino-activated 5kg Rat Flattener project, and yes it would flatten a 5kg rodent).
I asked this same question here last year and I believe they said the best thing was an inflow and an outflow sensor. Ultrasonic sensors would get moisture issues.
And 15 tonnes? Good luck.
I just went and searched back and can’t find it. I didn’t delete my posts. Don’t know where it is. Maybe the index doesn’t go back far enough.
@futuresprog
Farmgeek did one with ultrasonics a few years back. Seemed to work for a couple of years at least. I'm more concerned about the buildup of spider webs - that's what killed the old greenhouse electronics. Ironically the dodgy homebrew conductivity probes survived intact!
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