Michael Vinson wrote:
>
> 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?

        I use right now a Motorola MPX 5100 pressure senzor. 100 Kpa
range, 4.5 mV/hPa, with some amplification and offseting is quite
good. Many other options out there, but Motorola's are cheap. A little
noisy, but can be filtered in hardware/software. And a little hungry,
about 12 mA. A good barometer requires this senzor, an opamp and the
PIC of course.
        I also built variometers (vertical speed indicators) with this
sensor.

>
> 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!

        I searched too, with no more luck. I heard about a
Dallas/Maxim chip for this, I think it is not in production yet,
anyone knows more ?


Cosmin Buhu

>
> Michael V
>
> Thank you for reading my little posting.
>

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