I’m looking for ideas on how best to construct a cheap (let’s say <50GBP) well depth sensor, hooked up to an ESP32 or similar.
the max depth of the well is 20m. water level is typically between 1 and 8m. The sensor will need to be about 5m from the top of the well, so total wire length will be in the region of 25m. The wiring will be buried in conduits so needs to have some robustness. It will (unfortunately) run close to the live feed for the pump.
I’ve used simple switches in shallower wells with good success. the latest incarnation being two terminal blocks bolted into the inside of a pvc tube with a filter on the bottom, each terminal block having an INOX bolt protruding, wired to a weak pull up and ground.
That works well but I’d like to be measuring depth at 50cm-100cm intervals so there would need to be quite a few wires going down the well length. Which in turn leads me to concerns over inductance.
I’ve thought of pressure transducer and seemingly for £50 something can be acquired - but the well gets very silted up - is this likely to be an issue?