Hi, I am a newbie. I am interfacing an analog deflection type pH meter with arduino to calibrate the values obtained in mV to a scale of 0-14. How do I get the mV reading in arduino? How to convert the data to digital form and calibrate it?
It is possible to set the analogReference() to internal 1.1Volt and then do measurements. In theory you should get steps of ~1.1 mV In practice I doubt it will be stable.
You better use an amplifier for that kike below