Quote Originally Posted by BrianT View Post
I have read the Bosch datasheet which is very similar to the Intersema MS5540 family. With the exception of absolute altitude, LONGs and a PIC18F part will handle those formulae easily.
HTH
BrianT
Hi Brian, yes that helps me, a good confidence boost at the very least.
Can I bother you a moment longer ? About two things in the datasheet that you may well understand without looking at it again.

First is that the equations for the temp and pressure conversions have in there a couple of times the value called 'oss', used with a binary shift I think. Do you know what that 'oss' means ?

Lastly, I've been reading the raw pressure value with my code as a 16 bit Word, but it occurred to me now that even if I don't specify the hi-res mode, that I should be reading the full 19bits (LSB being 000 I guess) not just 16. The data sheet doesn't make it clear either way (to me).

TIA,
Martin