Just as a quick background - I work as a technician in the process automation industry and I have a mini project at home to do some automation for a friends greenhouse.
I'm looking to use the Pi as basically a mini PLC. I will be controlling a venting and sprinkling system via temperature and humidity inputs.
My question is.... Is the Pi capable of this type of thing and if so, does it take in 4...20 mA loop current directly so that I can A to D convert it or would I have to do this outside of the Pi? In the future I will also be looking to 'future proof' the system by allowing my friend to control the parameters wirelessly from a smartphone or computer.
If I have confused anything please don't hesitate to ask as I'm really excited at the prospect of this project and the Pi seems a perfect starting place.
Any information would be greatly appreciated.