I came across other old forum posts about using OG to monitor water level in a tank, and that is exactly one thing I would like to have.
OG certainly would not survive in the 100% humidity of the tank, so I agree with the suggestion to to use a waterproof ultrasound sensor.
What electrical requirements should it have and where would I solder it?
Alternatively, I have already in the bottom of the tank an accurate pressure transducer, with a digital voltmeter to show the level. Could I use such analog DC signal with OG and tweak the firmware? IT’s 0 to 5V. Where would I solder it?