Tom, > ... but it's going to be hard >to find temperature compensated sensors for much less than $20 in small >quantity. I too am looking to build a barometer and a popular sensor seems to be the Sensym SCX15AN which sells for $44.70 from Digikey! Is there a cheaper source that you know of for one of these? ps. How is your PIC-based logic analyzer project coming? Thanks, --rob--