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RFID Demo movie

You can use Parallax RFID reader module to identify object from a large set by hiding RFID card inside it. Basically reader has two signal pins, one out and one in. First is used to enable/disable reading, second is used for reading the card identification number.

RFID Connection schematics

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You can use Air v1.1 blow sensor to measure blowing with mouth, balloon etc. Registers inhale and exhale as well.

Demo movie of blow sensor and potentiometer in use

Schematic illustration

Pure Data patch for reading blow sensor and potentiometer

More info from manufacturers page

Kalle Mäntsälä & Tuomo Tarkiainen