My approach is to figure out what peripherals I need, then do a sort of
available chips by price. I choose the least expensive one that will do
the job. In your application, it LOOKS like you need 3 analog inputs.
You're driving an RF module. If it accepts serial data, you could use a
chip with a uart, but if you're just transmitting data, not receiving, a
bit banged uart is pretty simple and will allow use of a cheaper chip. The
hardware uart, though, doesn't add a whole lot of cost.

Do you have more details on your project?

Harold


>
> I'm trying to build a circuit that will detect 3 separate currents (DC) in
> three separate lines (12V) and energize LEDs associated with each line
> current.
>
> Right now I'm thinking RF modules and PICs on both ends of transmission.
> I
> dont know enough about PICs to decide which one or type to use.  How does
> one determine which one to use?  Does this sound logical, I'm slightly new
> to micro electronics.
>
> The next project is how to make the lights energize when there is current
> in
> the line.  I know I know, too much, but got an idea and no idea how to
> execute it.
>
> Thanks for any help
> --
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>
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