Input devices

A joystick can input movement

• These are mainly used to play computer games- but they can also be used to move a computer controlled deice such as a robot or a hospital body scanner.
• The joystick is fixed to a base but can be moved in any direction. Sensors convert th movement into co-ordinates which tell the compuer how to move the screen display or robot device

Scanners covert images into digital data

• A scanner works a bit like a fax machine. A picture is passed through the scanner and is converted into digital data. Light and dark parts of the piure are given different codes
• A problem is that these bitmap files can be very large and so…