Quote Originally Posted by RobertISaar View Post
otherwise the linearity suffers and you need to build a table around known points.
you're right. i'll do that for sure, probably as optional so people have a choice..

do you know what a typical curve would look like, or any data on tests other people have done? are we talking a curve down to a 0.25v dip in the middle or something? i could live with a percent but two or three might be bad news. other ecms must have similar circuits..

also wondering if the circuit for the a/c pressure input is of the same configuration as the other 5v inputs

i'm very happy to increase input accuracy with lookup tables. i already did that for temperature inputs. table lookups against an 8 bit value are very cheap when you have ram to play with, as long as you generate the table as a 256 byte array, the 'table lookup' is just a single address.

once my bench testing setup is working again, i'll grab a potentiometer and some voltage, and build a table.