Pressure Sensors

Breath Sensors
Freescale MPXM2010GS (this is used in the EWI)
MPXM2010GS
http://www.ewiusb.com/

3.3 mm diameter.
Use "hose clip"
http://www.silex.co.uk

Y Tubing Connector

http://forums.bobdunsire.com/forums/archive/index.php/t-135629.html

http://www.electronics-tutorials.ws/opamp/opamp_5.html

tlc272bcp
http://i173.photobucket.com/albums/w73/McThistle/circuit.jpg
http://www.ti.com/lit/an/slod006b/slod006b.pdf

INA114AP
Si7661

http://www.ucapps.de/midibox_ext.html

http://www.ponoko.com/
http://www.bigbluesaw.com/