I am currently trying to interface a input voltage with an Arduino that reads between +10v and -10v after it has been brought down to appropriate levels. The original use of this voltage drives a motor forward or backward based on the bias of the voltage.
My current idea to interface with the Arduino is to use a voltage divider to lower the voltage to the 5v range, and then to split the positive and negative voltages to separate analog input pins.
I have successfully pulled down the voltage to +5v to -5v, but I am struggling to convert the -0.01v to -5 to its own 0-5v analog input for the Arduino.
Does anyone have an idea on where to go with this? Or a better idea on where to start?