Jon,

I have no idea if you can find one acceptable for your purposes,
but I would look into automotive-style "hot wire" air mass
sensors.

-Keith Wheeler
ARMA Design                             http://www.ARMAnet.com/

At 06:20 PM 12/21/98 -0000, Jon Nicoll wrote:
>Hi there
>        I'm getting interested in the idea of making an system to
>measure the volume of air breathed by a subject. This is likely to have
>a PIC in there somewhere, obviously! ;-). I thought I'd ask for previous
>experience on this august forum...
>