I want to measure a low current (from 0 to 75mA) using the attached schemtaic for ACS712. The ACS712 sensitivity is 185mv and I want to use the max gain of 47 to input vout to a microcontroller(0-5vmax).
I want to make sure that this is how to correctly callibrate:
V=I x sensitivity x max gain so when I is 0 V is 0 when I is 75m V is 0.652125
Also I don't have any negative current so how do I connect the offset(R4)?