Sip and Puff iPod Dock Controller
By definition, Sip and Puff technology is a method used to send signals to devices using air pressure by sipping (inhaling) or puffing (exhaling) on a tube.
Detecting positive and negative air pressures in that tube can be done by using an air pressure sensor, the resulting pressure can be read from a sensor with ADC input pin of a microcontroller where in turn the microcontroller can control some device. In this case, that device is an iPod and the project name is Sip-n-Puff Arduino Shield.
Be sure to check the video where the author explains this method using Arduino in details.
© Bob Johnson