What is the best practice to create a 4-20mA input that can be feed in to microcontroller ADC pin?
A 500 ohm resistor across the 4-20mA creates a 2-10v input. 250 ohm for 1-5v input. Use code to check for a value below 1 or 2v (open).
If the signal is bipolar, 6v becomes zero, 10v full scale, 2v full scale negative.
The commons need to be tied together.
Thanks robogary .
