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I leave a part of the program ... basically is the operating principle of the mirror (input voltage for the analog port = output voltage filter pwm)

En español:
les dejo una parte del programa......

well, succeed in making a mirror with the help of the LM358.
Basically, what I do is with the first Ampop (12v source) is to convert the 4-20mA 0-5V input voltage ... that, I do mirror the output of...

thanks for the help; this is my project hardware (monitor voltage and current output proportional). The idea is to add the 0-5VDC output with pwm controlled to perform a transducer 0-5V / 0-10V /...

Hello, I have a doubt that while I can not solve ...
As I can do to reflect a pwm and a filter (resistor 1k and capacitor 1uf on the output pin of the pwm), I read the voltage with analog port ... ...