I am using a Arduino Due for simple ADC reading .
The basic concept is Controller has to read voltage of -10v to +10 input ,as of now I am Using an OPAMP to convert 0 to to 10V to 3.3v volt .
But I Don’t Know what to do with Negative Polarity and how to read it? this my first question …
and second thing i need to read current upto +/- 100mAMP using controller adc as feedback input.
Is it possible to read 100mAmp using arduino Due ??, Because i found maximum limit is 20mAmp .