I’m using a pH probe and a signal processing board (see attachment) that gives me an appropriate output voltage (e.g 3.7V for pH = 7 and 4.24 V for pH of about 5 (not sure exactly) the output voltage of the board is measured on the pins of the board between GND coming from the Arduino DUE and Vout (Po) of the board. The Analogpin (A0) on the DUE however gives me a numerical value of 4095 which is the equivalent of 5V max output. There is nothing else attached to the board. Just 5V supply and GND to the probe board and input of A0.
How is this possible?
Thanks for your time.