Hi, I am trying to read millivolts from a pH Probe on one of my analog ports.
pH probe produces voltages of between -440mV and +440mV depending on the pH of the solution it is in.
2 questions. Can the analog ports read negative voltages or only 0 to 3.3?
and is it sensitive enough to read millivoltes like this or should they be amplified. Typically I will be reading pH in the 8 range so the mV produced by the probe would be around 0 to 100mV
Thanks in advance