Hello guys
In my project i have to acquire a 4 to 20 mA current from the process station and work upon it in jMPC tool for designing a controller. How can I use arduino mega 2560 as a DAQ for controlling the process in real time?
If you pass the current through a suitable resistor you can measure the voltage across the resistor (and hence calculate the current) with one of the Arduino analog inputs. You don't actually need to calculate the current - you just need to get a number proportional to the current.
After that I have no idea because you have not told us anything about what must happen next, what data formats are used etc etc etc.
...R