1. Input Devices

2. What is input? Input refers to the process of entering data, programs, commands and user responses into memory Programs are sets of instructions to the computer Commands are keywords use the tell the computer to do something User responses are answers that the user inputs into the computer

3. The keyboard is the most common input device! 102 Keys that represent all of the ASCII characters

4. Pointing devices Mouse Trackball Touchpad Pointing Stick Joystick Pen input Touch Screen Light pen Digitizer Graphics tablet

5. Ball turns wheels causing pointer to move on the screen

6. The Optical Mouse With advances it mouse technology, it appears that the venerable wheeled mouse is in danger of extinction. The now-preferred device for pointing and clicking is the optical mouse Optical mice have several benefits over wheeled mice: No moving parts means less wear and a lower chance of failure. There's no way for dirt to get inside the mouse and interfere with the tracking sensors. Increased tracking resolution means smoother response. They don't require a special surface, such as a mouse pad

7. Trackball Trackball or mouse...mouse or trackball...why choose? The Orbit® USB Trackball gives you the best features of a mouse and a trackball in one easy-to-use input device, so you don't have to make concessions in your computing. Turn the no-win scenario into a win- win for yourself. Features and Benefits Orbit features the comfort of a mouse and benefits of a trackball Hand-hugging design encourages natural finger motion Trackball offers precise cursor control Trackball

8. Touchpad

9. Pointing Stick

10. Tablet PC with pointing stick Used to write or draw on the screen surface. Written words are converted to word processor text. Tablet PC’s also have keyboards for input

11. Palm Pilot

12. Joysticks

13. Touch Screen Used for small amounts of data

14. Digitizer converts points, lines and curves from a sketch, drawing or photograph.

15. Graphics Tablet Used for drawing and Computer Aided Design

16. CCD Mirror How Scanners Work Mirror focuses light on CCD CCD converts light to electrical current ADC converts electrical current into digital values for use in the computer Digital data may be further converted, using OCR software, into data that a word processor can use ADC Lens Flatbed Scanner

17. OCR Software Can be used with home computer to turn scanned documents (pictures) into ASCII text that you can use in a word processor

18. OCR Optical Character Recognition Scanners that can read typewritten, computer-printed and even hand printed characters and convert them to text that can be used in a word processor Above is an example of OCR character set Note the difference between zero and the letter O Frequently used in billing statements

19. Terminals (Display or video display VDT’s) Dumb terminals Keyboard and display screen Sometimes a modem Can transmit and receive but not store data Intelligent terminals Have built in processors and storage capabilities Special Purpose Terminals Point of Sale (POS) ATM Machines Can update inventory and do other tasks

20. Other Input Devices Although text is the most often used form of data input, sound and image input is also used To use sound you must have a sound card installed in your computer To use video input you must have a special video card installed in your computer

21. By using a microphone and a sound card you can store sounds on disk in the form of wave files. (voice or music)

22. Voice Input Allows you to use voice to input data into word processors, spreadsheets and databases. Used by health workers and phone companies

23. Video Input

24. ATI video cards allow input from multiple sources

25. PC Digital Camera Communicating with pictures through the internet or network at your school

26. Biological Input

27. Whiteboard Input Through the internet both classrooms see the same screen and share input