1. Lesson Objectives Aims You should be able to:
Understand the need for input and output devices
Describe suitable input devices for a range of computer controlled situations
Describe suitable output devices for a range of computer controlled situations
Discuss input and output devices for users with specific needs

2. This lesson…
…Is largely common sense
I’m going to print this and give it you as notes (unless I’ve forgotten, in which case I’ll be back in 5 minutes…)
You’re going to then use the information to do the exam question.

3. Input devices
Input device – A hardware device used to input data into a computer system for processing.
Examples:
Keyboard – A device that uses labelled keys to enable data input into a computer.
Mouse – A device that controls the movement of a pointer on screen, based on its own movement, and allows the user to select an object by pressing a button.
Other input devices include: touch screens, microphones, cameras, bar code scanners and sensors.

4. Input devices for users with specific needs
Some people cannot use standard input devices so they need specialist input devices, such as:
Eye typer – a camera tracks the eyes of the user to input data
Voice control – a microphones converts the users voice into commands for the computer
Joystick – joysticks require less movement than a keyboard and can control large robotic devices
Other devices include: Puff-stick switch, braille keyboard, braille printer and foot mouse

5. Output devices
Output device – A hardware device used to output computer commands into the real world.
Examples:
Monitor – A device that can display images and text.
Actuator – A device to produce physical movement based on output from a computer system.
Other output devices include: printer, speakers and projectors

6. Output devices for users with specific needs
Screen readers – turns screen text into audio for the visually impaired.
Voice synthesisers – turns typed words into audio for unable to communicate verbally.
Actuators – Create physical movement for people who have limited physical capability.

7. June 2013 Q4b