Peter Anderson wrote:

> I have used a Motorola MPX4115 to measure atmospheric
> pressure.
>
> We fussed with a Philips capacitor in a 555
> arrangement but didn't consider it any too rugged for
> outdoor temperatures.
>
> I have had good luck with the Honeywell HIH-3605 RH to
> voltage converter.
>
> There are BasicX BX24 routines for both the MPX4115
> and HIH-3605 at http://www.phanderson.com/basicx/.
>
> Peter H Anderson, http://www.phanderson.com
>
<snip>

I've noticed in your post, and others in a different
group, the idea of mounting pressure sensors outdoors.
Bad idea really. Much better to site the pressure
sensor inside. It won't make any difference for
the pressure reading as the pressure outside is the same
as inside AND the temperature inside is much more
stable!! You will have small pressure spikes from doors
opening and closing but that is easy to deal with.

Jim

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