How can Rpi connect to and read the DIY PH-4502C pH Sensor?
How can Rpi read DIY PH-4502C pH Sensor?
DIY PH-4502C pH Sensor has an analog output. So you can use a multimeter to read the analog values and use a voltage to pH values table to find the pH value. You can also use Rpi to interface an ADC eg, MCP3008, and convert the ADC results to pH values.
I am summarizing some of my findings below.
1. Setting up summary
Appendix A - Experiment Results