A mini project, where the appearance of the cat is voice-activated. Should the sensor sense a louder volume (input) above a certain threshold, the box lid will open up, revealing the little cardboard kitty (output).
The kitty’s appearance was aided by servo-motors, activated by a Phidget Interface Kit.
The Phidget Interface Kit was then plugged to MaxMsp on a laptop, which also served as a microphone to determine the magnitude in volume of the surroundings.
See the kitty in action: