How can Rpi connect to and read the DIY PH-4502C pH Sensor?

  • 1
    A couple of years ago I experimented with your pH sensor and found it good. I will try to make a short answer here. Stay tuned.
    – tlfong01
    Commented May 5, 2021 at 0:56
  • @Pierre Auger, when I answered the question (Ref 1) two years ago, there was only one user guide in Chinese, so everybody got confused. Then I translated the manual to English and also explained how to connect, calibrate, and convert the results. I already compiled a short conversion table. Perhaps you can do more experiments and compile your own conversion table. Happy experiments. Cheers.
    – tlfong01
    Commented May 5, 2021 at 1:23

1 Answer 1



How can Rpi read DIY PH-4502C pH Sensor?


  1. 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.

  2. I am summarizing some of my findings below.

1. Setting up summary

4502c module


example reading

conversion table


(1) DIY PH-4502C pH Sensor Calibration and ADC using MCP3008, PCF8591, and ADS1115, Asked 2019apr18, Viewed 14k times


Appendix A - Experiment Results

pH table



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