http://gizmodo.com/a-quadriplegic-racer-will-steer-a-stingray-with-his-hea-1575118033
driver interface developed by Ball allows the user to interact with the car using only head-based controls. The driver wears a hat studded with reflective infrared markers. Inside the vehicle, a series of infrared cameras sees the driver tilting his/her head to the left or right and turns the car accordingly. To accelerate and set the cars speed, the driver moves his/her head backward. To brake and stop the car, the driver bites down on a pressure sensor in his/her mouth.
In milliseconds, this system sends signals to a computer that controls the car through an intricate network of sensors and motors that are tied into the car?s standard steering, acceleration and braking systems.
The computer also integrates a GPS system that electronically establishes "virtual curbs" one meter from the edges of the track. If the car reaches this limit, the system warns the driver to correct course. If the car continues to drift, the system gently auto-corrects the car to keep it on the track.
Arrow SAM Project