Something like this listing? Looks like they have one that signals at 0-3.3V and is powered by 5V. I may go ahead and order one and try to build up one of these sensors. The leaded pressure sensor seems like a far more stable solution than the ultrasonic methods I’ve been seeing.
Yes that is what I was looking at (at least those same specs; I have no opinion or information on any of the different sellers).
I use an ultrasonic sensor for a different application (water softener salt tank level) and it is definitely much less accurate / has way more noise and variability. These submerged liquid sensors are pretty rock solid.
If you get one and get your sensor running please follow up with feedback on how well it works.
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Just a small update, I did order the 0-3.3V device. It is running off of the same 5V USB wall wart as the ESP and I have the output signal routed directly into the ADC. I only just configured the minimum viable config for what I needed until I have more time but it seems to be working great! The main thing I next need to tweak is some excess noise in the data and implement an alarm feature for high levels. But I can confirm the 3.3V sensor works great!
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