Need an introduction to switches for people who are deafblind with limited mobility? Start with this article that explains the basics.
"Using Single Switch Technology With Individuals Who Are Deafblind."
Single Switch Article
Switches may be used to encourage movement, assist in the development of observing cause and effect, create recreational opportunities and even provide access to simple choice making and expressive communication.
Switches can run devices such as toys, some appliances and computer input systems. This section shows how to adapt some battery powered toys and build a computer input device for a few dollars.