In this tutorial, we will walk through the process of interfacing a pH sensor with an Arduino UNO in Proteus. To make the project more practical and user-friendly, an LCD is included so that both the sensor’s voltage output and the calculated pH value can be displayed clearly in real time. This allows the user to easily monitor the readings without needing additional software or serial monitoring tools. Libraries Libraries used in this tutorial Arduino UNO Library for Proteus: V1.0 (2015, used in this tutorial) · latest version: V4.0 (October 2026) pH Sensor Library for Proteus: V1.0 (2021, used in this tutorial) LCD Library for Proteus: V2.0 (2023, used in this tutorial) · latest version: V3.0 (October 2026) Helping Tools Serial Monitor Advance : a serial terminal window for the UART of y ...