I am looking for the possibility to monitor the level in a rainwater tank. It should be sufficient to monitor steps like "empty", "quarter", "half", three quarter" and "full".
There are loads of leakage detectors on the market- most of them bring their own control device which frequently has an 1-wire interface. Well, and all of them costs a fortune (usually around 70-150€).
Now I realized such leakage detectors are usually not more than just two cables which will use water as switching medium. So how about using the following circuit with 5V or 24V as power supply?
When water reaches two open wires the circuit gets closed and is recognized by the DI.
In this case, if all DIs are open, water is empty. If all are closed it has reached max.
Would this work?