Matthew Irvine Brown has made an interesting project which can control a car with breath. To accomplish his task he took a standard RC toy car, Yamaha BC3 MIDI breath controller and a cheap remote of a toy car which will make his car move forward and backward.
So how does breath help to control a car?
Yamaha BC3 MIDI breath controller converts the breath pressure into MIDI data which is then converted to serial data and that data is received by the car with the help of Bluetooth and PIC chip on the car. A harder blow into the breath controller steers it to the right whereas a softer one to the left.