Low-cost, open-source “sip-and-puff” interface to enable new methods of expression for people with and without limited mobility. by Jason Webb:
Commercial sip and puff devices have been available for quite some time but are generally prohibitively expensive, highly specialized, limited in expressivity, require poorly-written and restrictive software and rely on clunky, out-of-date hardware that makes it difficult or impossible to integrate with modern operating systems and even basic software.
Therefore the main objective of openSip+Puff is to provide a cheap, simple, open and modern alternative input method based on the breath of a user that can be easily mapped to a variety of common actions like mouse clicks and keypresses.
openSip+Puff for people with limited mobility – [Link]