Breaking News
Slideshow

Top 10 Sensor Trends to Watch

2/10/2014 10:55 AM EST
22 comments
< Previous Page 7 / 11 Next >
More Related Links
View Comments: Oldest First | Newest First | Threaded View
<<   <   Page 3 / 3
DrQuine
User Rank
CEO
Re: Bosch MEMS sensor - air pressure and SI units
DrQuine   2/13/2014 4:58:32 PM
NO RATINGS
Thanks for the "QNH" aviation explanation.  Certainly the same approach could work for SmartPhones: the GPS would provide a location and the nearest reference barometer could provide the correction factor.  The one remaining issue would be the pressure differential inside the building.  Many buildings run at positive pressure which would cause the "altimeter" to read a lower floor level than it should (denser air). Perhaps a simpler approach would be for the GPS to detect entry into the building perimeter, use the indoor ground level air pressure as the barometric pressure reference. It could then compute floor levels by the associated pressure reductions as the air pressure reduced with increasing altitude.

David Ashton
User Rank
Blogger
Re: Bosch MEMS sensor - air pressure and SI units
David Ashton   2/13/2014 5:15:10 PM
NO RATINGS
@DrQuine....I didn't know about buildings being pressurised.  As you say there are ways round this but the easiest thing is probably to find an elevator and see what floor you are on :-)

<<   <   Page 3 / 3
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
EE Times editor Junko Yoshida grills two executives --Rick Walker, senior product marketing manager for IoT and home automation for CSR, and Jim Reich, CTO and co-founder at Palatehome.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed