Hi,

I'm trying to build a pressure sensor (altimeter). I have a working circuit and a mpx pressure sensor. I have changed the ref voltages to get more resolution. I'm using a 16f877.

My problem is that I have worked out I get .002421875v per step (0 to 1024)+ the 2.47 ref. I'm currently measuring 671 from my a/d result. I've read about scalling up etc, but I'd exceed the limit of an integer with this?

I want to do

671 * 0.02421875

This must be possible, but maths is my stong point I am afraid! Could someone point me in the right direction?

Thanks.