Short Description

A switch is a device which provides a means of control over electronic or battery operated equipment. Switches can be mechanical or non-mechanical. A mechanical switch requires a force to be applied in order to close an electrical circuit, which in turn activates an electronic device. The term "switch" generally refers to a device which consists of a microswitch housed within some type of casing.

More Details

To activate the switch, it is usually depressed by a part of the body
(eg. hand, foot, head, knee) in order to close the microswitch and complete the circuit. Switch housings can alter the amount of force required to close the microswitch. Pressures necessary to activate a switch range from a light touch to a significant force. A non-mechanical switch does not require force for activation. The most common example of a non-mechanical switch involves breaking an infrared beam, similar to a burglar alarm.

It is not possible to plug switches directly into commercially available
equipment such as toys, computers or electrical devices. The equipment must be modified or some type of interface must be used. Interfaces provide a link between the device/equipment and the means by which to operate it. There are numerous types of interfaces, some of which provide a simple connection whilst others allow sophisticated customisation. The options for interface range from the simple battery interrupter to Ke:nx which is a powerful tool to enable highly customised access to a Macintosh computer.

There is an immense variety of switches available to suit the varied needs of individuals. There are also several interface options available. Suppliers and specialist resource centres may be contacted for further details.

CONSULTATION:
In some situations it may be advisable to consult an expert in the area of technology for people with disabilities. The Computer Assistive Technology Services (CATS) is a division of Northcott and located in North Parramatta. They also travel extensively throughout NSW. The Assistive Technology Service of Cerebral Palsy Alliance is located in Allambie Heights.

This information has been prepared by the COMPUTER ASSISTIVE TECHNOLOGY SERVICE (Div. of Northcott).

Standards

Some assistive technology needs to meet Australian or other standards. Standards may relate to materials, manufacturing and installation. Products that meet Australian or international standards will have written certification. To find out if a product meets Australian Standards ask the supplier to show you the certificate. For a fact sheet about standards contact us or visit www.ilcaustralia.org/home/standards.asp