Help with ADC conversion

[mister_e]

That will be hard to setup PIC18F1320 analog comparator, as he don't have any BUT... PIC18F2220 and lots other have some already built-in.

Internal analog comparator works as regular voltage comparator (LM393 and so on), you set a voltage reference on one input pin (voltage divider, trim pot, whatever else fancy stuff), and you apply your signal on the other input pin, then you just monitor the voltage comparator output.

In a PIC, when the output of the comparator change, it can trigger an interrupt event, so it's done in background. Once in the Interrupt handler, you do what you need to do.

Have a look at Darrel's Instant interrupt, this will save you some headaches. There's also some code-example on how to use'em with Timer.
http://www.pbpgroup.com/modules/wfse...p?articleid=19

From there, you should be able to begin some experiments.

[dbachman]

Hey Steve,

I was just check'n to see if you would catch that............not.

Anyway, I do have a couple of 18F2550 which look like they have the analog comparators. After looking at THAT datasheet, things are becoming a little more clear. I think I actually might be able to put something together. Thanks for the help and hopefully you can stand by as I try to get this to work.

Thanks, Don