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neb:
Another option I'm looking at using is this, of which there are large numbers of clones on Ali. It uses pressure-based sensing so no need for calibration or problems due to reflectivity of ultrasonics.
If it's what I think it is (I'm getting page not found), ie. a hydrostatic pressure sensor, that was my first choice. But they seemed to be about $80ea from Ali last I looked, whereas sealed ultrasonic transducer modules are a few bucks. Yeah, there are shortcomings but I'm going to give it a good go before switching.
So far it's been pretty good. We had a bit of rain the other day, and it was great to see it go up and taper off over time:
As you can see, there's a bit of variability there especially from waves on the surface when the water started coming in. Not a major problem, however a bigger problem came from the placement of the transducer. As you can see in the earlier photos it was right next to the inlet pipe: in hindsight that was an obviously poor choice, as it means that occasionally I get a spike when it detects incoming water much closer than the surface:
(EDIT: wrong pic)
I can move it well away from the inlet but there are some complications with doing that, eg. extending the cable. A software solution might be more appropriate. I'm still mulling that one over.
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