Hello , I was working on pH sensor and Arduino project recently but pH sensor is giving same fluctuating values as 8.74,6.15,9.02 for all three buffer solution I am super confused I have connected power supply to sensor board and output pin to a0 nothing that would make mistake and code also I just want to print mV generated first rather than calibration I also connected ph probe to pH meter in lab today and it was working fine
Please if someone can help
So what’s the output of the ph probe - if it’s “mV” and high impedance then it won’t work .
As standard you have 5v span , so a 5mv resolution.
But we need to see your code and the device spec - be interesting to see the raw A/D output
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