I just started learning PIC controllers. I have a number of ideas
brewing.

The first is a digital air pressure regulator. Sounds really easy to me.
I want to be able to turn a dial and have the limit displayed on a 7
segment led. I also want the limit displayed without actually having the
pressure in the system, so a sensor reading line pressure is not
appropriate.

A quick A/D and either a stepper motor connected to a manual regulator
or  I was thinking of a rotory encoder to give a position of the air
reg. screw and then interpolating this into a digital readout, Or
perhaps I could read actual spring pressure on the diaphram? Or
something else

The something else is what I would like some input on.

I plan on the 16F84  as I have info on it. Any/all input appreciated.

TIA

Pat Roberts