Problem with Calibration of pH Sensor / Meter Pro Kit V2
mtsaniaz 2023-05-03 07:04:01 2441 Views11 Replies I just bought Gravity: Analog Industrial pH Sensor / Meter Pro Kit V2, and i tried to calibrate it, when i put the probe into 7 buffer solution, the ph was always read around 5.72, and when i put the probe into 4 buffer solution, the ph was always read around 2.8, it is too far from the buffer solution, can anyone help please, thank you
Hello, I have been able to successfully perform a calibration setting with the provided code from the Wiki. However, on an ESP32 it does not store properly to the EEPROM. Can you provide code to use an ESP32 or expose the calibration values so we can manually include them, similar to how you do it with the dissolved oxygen meter. Thanks for any and all help you can provide.
Matthew.Monte After uploading the EEPROM code once, the content in the specified location in the ESP32's EEPROM can be erased. Please re-upload the sample code and perform calibration again.
If the problem persists, it is recommended to replace the ESP32 and check whether there is a problem with the board.
Thank you, Jenna. I have done what you suggested, but I do not have stored calibration.
The EEPROM code returns the following, which I believe shows that the values are not being stored:
0:0
1:0
2:0
3:0
4:0
5:0
6:0
7:0
Is it possible to access these variables manually and store them in the sample code, instead of EEPROM?
Thank you for your kind help! ==Matt==
Hi Matthew.Monte,
Sorry for the late reply.
After our test, it is a pity that ESP32 cannot save EEPROM. We recommend that you use a module similar to ADS1115 to ensure the accuracy of the data read by ESP32.
The ph sensor is compatible with arduino uno, arduino mega2560 etc. If on esp32, you need to add ads module. If it is used with other controllers, please check the voltage and ADC of the controller, and modify the library file.
jenna Sure, I'd be more than happy to help. It sounds like you might need to recalibrate your pH meter. To do this, start by submerging the probe into a known solution of a given pH and then use the meter's adjustment tools to bring the reading to the correct pH level. If that doesn't work, you may need a new calibration fluid or a new probe.
Juna.Miles Hi, did you enter all the commands as shown in this wiki?
https://wiki.dfrobot.com/Gravity__Analog_pH_Sensor_Meter_Kit_V2_SKU_SEN0161-V2
bidrohini.bidrohini 
