Stolen from https://github.com/DFRobot/DFRobot_PH to fix the issue DFRobot/DFRobot_PH#10
Used as a simple testing of the pH probe.
To you know that pH, historically denotes "potential of hydrogen"?
This was done in platformio in VSCode.
Typical ouput of src/main.cpp
''' bash _neutralVoltage:1500.00 _acidVoltage:2032.44 temperature:25.0^C pH:8.85 '''
Gravity: Analog Electrical Conductivity Sensor /Meter V2 (K=1)