I need to sample the half wave of an AC signal, therefore I am looking for the ways which will give me precise results. I want to use precision amplifier but since I cant provide negative voltage from the Arduino to the op amp, it doesn’t work.
I tried to give positive voltage from the non-inverting input, it did work up to some value. However, because I feed it with +5 V, after some value, this method doesn’t work as well.
Could you give me idea about how I can cope with it ? Thank you.