1. Standard Input Devices
Week # 02
Course: Introduction to Computers
Course Code: CIT-1101
Presented by: Bulbul Ahamed
Assistant Professor of CSE, NUB
November 21, 2017
Bulbul Ahamed

2. Outline Definition of Input Device Keyboard Mouse, Trackball
Touchpad, Microphone
Digital Camera, Web Cam
Scanners
Bar Code Reader
OMR, OCR
November 21, 2017
Bulbul Ahamed

3. Input Devices Enter data to be processed D C A B The rain in Spain
Input devices include keyboards and mice, but also scanners, cameras, microphones, and even network cards and modems. Data that gets into the computer must come through an input device.
The rain in Spain

4. Input Device …
An input device is any hardware component that allows users to enter data and instructions into a computer.
Examples:
Digital Camera
Web Cam
Scanner
Bar Code Readers
OMR
OCR
Keyboard
Mouse
Trackball
Touchpad
Microphone
November 21, 2017
Bulbul Ahamed

5. Keyboard
The most common input device, used to enter letters, numbers, symbols, punctuation and commands into the computer.
A standard computer keyboard has 101 keys; each key sends a different signal to the CPU.
November 21, 2017
Bulbul Ahamed

6. Keyboard (Cont…)
IBM computers has 101 keys. They are arranged in five groups:
Alphanumeric keys: A-Z, 0-9, Symbols (#, &, % etc), Enter, Backspace, Caps Lock, Tab, Spacebar etc.
Modifier Keys: Shift, Ctrl, Alt
Numeric Keypad: Num Lock, 0-9, /, *, -, +
Function Key: F1-F12
Cursor-Movement Keys: Arrows (Up, Down, Left, Right), Insert, Home, Page up, Delete, End, Page Down, Print Screen Sys Rq, Scroll Lock, Pause Break
Special-Purpose Keys: Start, Shortcut
November 21, 2017
Bulbul Ahamed

7. Keyboard (Cont…)
November 21, 2017
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8. Mouse
A mouse is a hand-movable input device that controls the position of the cursor or pointer on a screen.
Commonly used with desktop computers
Frequently one can upgrade the mouse
2 button with wheels
Optical Mouse.. no trackballs!
Wireless Mouse …no tail!
Optical Mouse
Wireless Mouse
November 21, 2017
Bulbul Ahamed

9. Configuration of a Mouse
Wheel
Right Button
Left Button

10. Trackball
A trackball is a pointing device with a ball on its top or side.
The onscreen pointer is moved by the trackball with a thumb or finger.
Most trackballs feature two buttons, although three button models are also available.
Trackballs are used frequently with laptop computers.
November 21, 2017
Bulbul Ahamed

11. Touchpad
A pressure-sensitive input device used to control the on-screen pointer by moving the fingertips over the pad's surface.
Used especially on laptop computers as an alternative to a mouse.
It has two or three buttons that perform the same functions as mouse buttons.
November 21, 2017
Bulbul Ahamed

12. Microphones - Speech Recognition
Use a microphone to talk to your computer
Add a sound card to your computer
Sound card
digitizes audio input into 0/1s
A speech recognition program can process the input and convert it into machine-recognized commands or input
November 21, 2017
Bulbul Ahamed

13. Digital Camera
A digital camera (or digicam for short) is a camera that allows users to take pictures or video digitally, instead of on traditional film.
Used to record images that can be viewed and edited on a computer.
November 21, 2017
Bulbul Ahamed

14. Web Cam
Webcams are video capturing devices connected to computers or computer networks.
A Web cam or Web camera connected to a computer or server that allows anyone connected to the Internet to view still pictures or motion video of a user.
November 21, 2017
Bulbul Ahamed

15. **A PC Equipped with a Computer Camera
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16. Scanners
An optical scanner, usually called scanner, is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can process.
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17. Scanners (Cont…)
Image
Edit
Scan
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18. Optical Reader
An optical reader is a device that uses light source to read characters, marks, and codes and then convert them into digital data that a computer can process.
Optical
Character
Reader
(OCR)
Mark
(OMR)
Bar
Code
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19. Bar Code
A bar code is made up of vertical printed lines (bars) and spaces. The sequence of bars and spaces of different thickness represents a sequence of numbers.
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20. Bar Code Readers (Cont…)
Bar Code Reader – also called a bar code scanner, is an optical reader that uses laser beams to read bar codes by using light patterns that pass through the bar code lines.
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21. Optical Mark Reader
OMR is a special scanning device that reads hand drawn marks such as small circles or rectangles on specially designed documents.
Example: The OMR device scans the answer key sheet to record correct answers based on patterns of light.
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22. Optical Mark Reader (Cont…)
Use lead pencil to mark on scan sheet
Feed the scan sheets into the OMR
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23. Where do we use OMR? School registration Lottery Tickets
Some questionnaires
Multiple choice examinations
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24. Optical Character Recognition
OCR technology that enables a computer to translate optically scanned text into character codes, that you can edit.
OCR software can be installed in a computer to perform character recognition.
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25. Optical Character Recognition (Cont…)
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26. Thanks for your Attention !!
Any Questions…?
Thanks for your Attention !!
November 21, 2017
Bulbul Ahamed