Current sensor (outputs voltage) PUBLIC

A simple way to measure current in your circuit with shunt resistor. To amplify output signal I used operational amplifier.
Output voltage should go to ADC.
Optimised for 3.3V@2A and 5V@3A.

I was wondering how to measure current flowing through my stepper motor. Also I needed to use collected data to adjust controls of stepper motor that's why I can't simply use ampere-meter. Out put signal should go to ADC of the control unit (probably Arduino or Discovery).

In my design mean current will be 2A and peak current 3A. For that reason I chosen U_out@2A=3.3V and U_out@3A=5V.

I have also calculated R₀ and R₁ values for different R_s resistors:

[table] [tr] [th]R_s[/th][th]R₀[/th][th]R₁[/th] [/tr] [tr] [td]0.10[/td][td]13k[/td][td]820[/td] [/tr] [tr][td]0.22[/td][td]22k[/td][td]3.3k[/td] [/tr] [tr] [td]0.47[/td][td]6.8k[/td][td]2.7k[/td] [/tr] [/table]