The document discusses various computer input devices. It describes keyboards as the most fundamental input device, allowing users to enter letters, numbers, and commands. Mice are also covered, noting they allow users to control screen pointers and click buttons. Additional input devices covered include scanners, which convert documents to digital formats, optical character readers for text recognition, bar code readers for product labeling, magnetic ink character readers for processing bank checks, microphones for sound input, and webcams for video conferencing.

2. TOPIC TO BE
PRESENTED
I N P U T & O U T P U T U N I T S O F C O M P U T E R

3. TODAY AGENDA
• INPUT UNIT
• MOUSE
• KEYBOARD
• SCANNER
• OCR
• BAR CODE READER
• MICR
• MICRO PHONE
• WEB CAM

4. INPUT UNIT
• An input device for a computer allows you to enter
information.
• Input is an initial unit which provides communication b/w user
and computer.
• Input units accepts data from user.
• Converts data in computer readable form.
• E.g. Keyboard, Mouse, Scanner, Joystick etc

5. INPUT DEVICES

6. MOUSE
• Typically, a mouse resides on a flat surface, and by moving the mouse,
you can move the pointer on the screen.
• One or more buttons on the mouse allow you to enter instructions by
clicking. Most models also include a wheel for scrolling.

7. KEYBOARD
• A keyboard is the most fundamental input device for any computer
system. In the early days of computing, it was typically the only input
device.
• A keyboard contains keys for letters and numbers as well as for
specialized tasks, such as Enter, Delete, etc.

9. SCANNER
• Scanner scans documents such as photographs and paper.
• When a document is scanned it is converted into a digital
format.
• This creates an electrical version of the document that can be
viewed and edited on the computer.

10. SCANNER

11. OPTICAL CHARACTER READER (OCR)
• OCR is a device that utilize light beam to read alphanumeric
characters of both handwritten and typed text .
• These devices are used for large volume processing
applications such as scanning of utility bills of the customer
credit cards of different companies.

12. OCR

13. OCR DEVICE

14. BAR CODE READER
• It is capable of reading data in the form of bars/lines
• This device is dependent on black & white strips of the
universal product code used on item found in most
supermarkets .
• Bar codes are used for labeling good and stock in a shop.

15. BAR CODE READER

16. MAGNETIC INK CHARACTER READER
(MICR)
• A device developed for overcoming the burdens of cheque handling in
banks .
• This device speeds up the process of data entry of the cheques which is
directly entered into the input devices .
• When a document such as bank checks containing this magnetic ink is
to be processed , it is passed through a machine which magnetize the
ink and special character information is extracted and translated in the
form of character.
• It is fast technique of scanning and processing information .it can
increase the security and protection as well as reduced the risk of loss
due to identity their theft crimes .

17. MICR

18. MICRO PHONE
• It converts sound into signals that can be fed into the
computer .
• The signals from a micro phone are usually Analog, so it can
be processed by the computer, it is converted into the digital
signals.

19. MICROPHONE

20. WEBCAM
• It is very basic video camera used to feed live into
computer.
• This video data from a web cam is low quality
compared to a full video camera.
• However it is good enough for web chats e.g. Skype,
MSN.

21. WEBCAM