I have used a 0-15 psi gauge type. With an op-amp or instrumentation amp you can amplify the output and keep it in the 14psi zone. I measured barometric pressure with it on a breadboard for a while. They are usually temperature compensated. It looks like an 8-pin DIP with a single vertical tube on it. Also by attaching heatshrink tube to it and blowing you can make a kind of musical instrument controller...Check out motorola app note AN1318 at http://e-www.motorola.com/brdata/PDFDB/docs/AN1318.pdf /\/\/\/*=Martin ----- Original Message ----- From: "Michael Vinson" To: Sent: Friday, February 01, 2002 3:51 PM Subject: [EE]: Barometric pressure? (was: 8- vs 12-bit A/D advantages) > Paul Hutchinson wrote, in part: > >Barometric pressure measurement for example is expected to be readable from > >27.5 to 31.5 inHg with a resolution of 0.01inHg or 0.001inHg. At 8 bits you > >only get ~0.016inHg resolution, 12 bits would give you 0.00098inHg > >resolution. > > That reminds me of something I've been meaning to ask. What kind of > sensor would one use to measure barometric pressure electronically? > I've seen "pressure sensors" that only measure a few PSI, but never > something that is optimized for collecting weather data. Surely there > is such a thing? > > And on a similar topic, I'm interested in the Philips H1 humidity > sensor, but I can't find a source (even a price) for it. Part of > the problem is the name "H1" is too short for some of the search > engines (e.g. findchips.com). Thanks in advance for any help! > > Michael V > > Thank you for reading my little posting. > > > _________________________________________________________________ > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp. > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads