I want to add two voltages.
I have tried using the Op-Amp adder here. The resistor schematic before the summing amplifier contains resistors in parallel which would average the voltage.
My problem is that I would have one steady voltage and another variable voltage coming from a pressure sensor. It would vary.
What I want is to add 0.5 volts to the voltage from a sensor (say 1.5) so that resultant voltage is 2.0.