Hello friends, I hope you all are doing great. Today, I am going to share the new Water Sensor Library for Proteus V2.0 . The water sensor is the long red board with a comb of copper traces and three pins, S, + and -, that makers use as a water level sensor in tanks, cups and plant pots. Water on the traces drives a small S8050 transistor, so the S pin gives a voltage that rises with the water. With this Water Sensor Library for Proteus , you fill and drain a virtual tank with buttons, and your Arduino reads S with analogRead() , just like on a real board. Updates Water Sensor Library for Proteus Latest version: V2.0 (October 2026, this tutorial) Earlier versions: V1.0 (2020) Other water and soil sensors: Soil Moisture · Capacitive Soil · Rain Sensor · TDS Meter · Turbidity · YF-S201 Flow ...