I'm trying to digitize a Hall Sensor whose center voltage is 2.5V and the gain it's output is 1.5V to 3.5V, or ±1V. My digitizing card's center voltage is 0V and I would like to get the full range of the sensor in the 0V space, -1V to +1V. I'm using a LM358 op amp to try to do the task. I'm very new to building circuits and I really don't know where to start.
You can do this:
Note that the op-amp requires +/- supplies. You can generate the negative supply from your +5V supply using an ICL7660 and a few ceramic or electrolytic capacitors. Not shown are supply bypass capacitors.