I'm trying to designing a water level indicator using npn transistor(BC548). I tried simulating the circuit on PSpice, but I don't know what to add for the sensor. I want a graph.
The circuit will look something like this-
[![Water level indicator](https://i.stack.imgur.com/eGrE4.jpg)](https://i.stack.imgur.com/eGrE4.jpg)

I just want to know what can I use for the parts that is sub-merged in the bucket in PSpice/OrCad.