Input devices by m.traiq
- 2. Input Devices • Input devices are those devices from which we can input data and instructions into the computers. A number of input devices have been developed.
- 3. KEYBOARD It is most commonly used input device. It is used to input data into written form. Keyboard is merely a collection of momentary switches.
- 4. MULTIMEDIA KEYBOARD • Multimedia keyboard has some additional keys to operate multimedia operations like volume up, volume down, play, pause, stop etc.
- 5. Buttons on a keyboard are called Keys. We can type letters, numbers by simply pressing these keys. KEYS ON A KEYBOARD
- 6. NORMAL KEYBOARD • A normal keyboard has 101-104 keys which are distributed in five categories. • Function keys F1 to F12 • Alphanumeric keys A-Z, a-z, 0-9 • Special keys Alt, Ctrl, Enter, Insert, Home, End, Esc etc. • Numeric keypad 0-9,+,-,*,%,@ etc.
- 7. The different keys on the keyboard are: 1. Alphabetic Keys 2. Number Keys 3. Function Keys 4. Special Keys 5. Arrow Keys Types of Keys
- 8. ALPHABETIC KEYS These are marked with the English alphabets from A to Z. There are 26 Alphabetic Keys. They are placed closely so that our fingers can reach there easily.
- 9. NUMERIC KEYS The keys marked with numbers from 0 to 9 are called Number Keys. The number keys are also placed at the right side of the Keyboard known as Numeric Keypad.
- 10. Special Keys These keys works in combination with other keys
- 11. Spacebar Key * Longest key on the keyboard. * Used to give spaces between the words.
- 12. Cursor Movement keys Used to move the cursor in four direction i.e. up, down, left and right. UP LEFT RIGHT DOWN
- 13. Caps Lock Key Used to type the letters in capitals When you press the Caps Lock Key the light on the keyboard will turn ON. If you press it again, the light will turn OFF.
- 14. Backspace Key Used to delete the character to the left of the cursor
- 15. Shift Key Used to type the letters in capital or small case without using Caps Lock key. Also used to type symbols printed on the top of the Number Keys. !
- 16. Enter Key Used to tell the computer that you have finished a word or line. It brings the cursor down to the next line.
- 17. Delete Key Used to erase anything typed from the right side of the cursor.
- 18. Function Keys The Function keys are placed at the top row of the keyboard marked with F1, F2.......F12 They are used to perform special functions.
- 19. Tab Key Allows the cursor to jump five spaces forward
- 20. All the above keys combined together to form a Keyboard
- 21. POINTING Devices • Input devices those are used to control the movement of cursor on screen are called pointing devices
- 22. MOUSE • It is a pointing device used to insert instructions into the computers. It is a hand held device that controls the pointer on the screen. It has two buttons viz. left button & right button & one scrolling wheel. With the help of mouse you can draw images, select options & move text & images.
- 23. TRADITIONAL MOUSE • Traditional mouse is used a ball built into the bottom with two small rollers placed two sides of the ball at 90 degree angle from each other. They spin when the ball rolls. A sensor detects how much each roller spins and sends the information to computer and the pointer on the screen moves into the same direction.
- 24. OPTICAL MOUSE • Optical mouse is a advance pointing device that uses a light diode (LED)(1), an optical sensor (2) and a digital signal (3) processing in place of traditional mouse ball. Optical mouse need plan surface to produce high performance efficiency. Each time the mouse is moved, the beam of light is interrupted by the surface.
- 25. Tracker ball • A trackball is a pointing device which look like mouse. It has two or more buttons. The buttons work like mouse. It has a rotating ball on it top. The ball move with the help of finger. Rotating the ball move the cursor on screen.
- 26. Touch Pad • A touchpad is a pointing device consisting of specialized surface that can translate the motion and position of a user's fingers to a relative position on screen.
- 27. TOUCH SCREEN • Touch screen is the easiest way to data input into computer. Touch screen allows the user to select the item by touching the screen at appropriate spot. It has another feature that the user’s finger become the input device to operate touch screen.
- 28. Touch Screen • A touch sensitive display you interact with by touching areas of the screen with your fingers • ATM machines, Mobile phones
- 29. Pointing Stick • Pressure sensitive device shaped like a pencil eraser that is positioned between keys on the keyboard. • First developed by IBM for their notebook computers
- 30. Graphic Tablet • It is a flat, rectangular electronic plastic board • Also called a “digitizer” or “digitizing tablet” • Used along with a stylus • One use: architects, map makers, artists, and designers create drawings and sketches using it
- 31. Light Pen • A handheld device that contains a light source or can detect light. • Some require specially designed monitors. • One problem is hand fatigue.
- 32. Light Pen • A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT TV set or monitor.
- 33. JOYSTICK • Joystick is a pointing device mostly used for playing games. This is a device used to control the actions in a computer game. It consist of a lever used to move the pointer on the screen and buttons used to select options.
- 34. Pen-based Computer System • Weighs around 3 lbs. • Uses a digital pen • Microsoft version uses Windows XP Professional • It has handwriting and voice recognition capabilities – Take notes and save them – Convert handwritten documents into typed documents
- 35. Stylus • Looks like a ballpoint pen. It uses pressure to write and draw lines. • Original names were: “electronic pen” or “e-pen”
- 36. Source Data entry Devices • Input devices those are used for direct data entry to the computer system.
- 37. Bar code reader • Bar code reader are used to read the values printed on the product in form of vertical lines. Bar codes are recorded on the products by the manufacturers and usually carry the product number.
- 39. MICR – Magnetic Ink Character Recognition • MICR is used by banking industry for faster processing of large volume of cheques • Bank’s identification code (name, branch, etc.), account number and cheque number are pre- printed (encoded)using characters from a special character set on all cheques • Special ink is used that contains magnetizable particles of iron oxide • MICR reader-sorter reads data on cheques and sorts them for distribution to other banks or for further processing
- 41. OCR – Optical Character Recognition • Scanner with a character recognition software (called OCR software) that converts the bit map images of characters to ASCII codes • Enables word processing of input text and also requires less space for storing the document • OCR software is extremely complex because it is difficult to make a computer recognize an unlimited number of fonts • Two standard OCR fonts are OCR-A (American standard) and OCR-B (European standard)
- 43. OMR – Optical Mark Reader • Scanner capable of recognizing a pre-specified type of mark by pencil or pen • Very useful for grading tests with objective type questions, or for any input data that is of a choice or selection nature
- 45. OMR Sheet
- 46. Magnetic Stripe • A magnetic stripe card is a type of card capable of storing data by modifying the magnetism of tiny iron-based magnetic particles on a band of magnetic material on the card.
- 47. Smart Cards Future Life……… Santosh Khadsare
- 48. What is a smart card? A smart card is a plastic card with a small, built in microcomputer chip and integrated circuit that can store and process a lot of data
- 49. What is a Smart Card? A Smart card is a plastic card about the size of a credit card, with an embedded microchip that can be loaded with data, used for telephone calling, cash payments , and other applications, and then periodically refreshed for additional use.
- 50. The Fax Machine
- 51. Dedicated Fax Machine It is normal fax machine
- 52. Fax Modem It is a circuit board inside the system unit. It can send & receive fax from one computer to another.
- 53. Audio input • Microphone is an input device used to inputting the voice signal into the computer. microphones are commonly used for live chat. Microphones are also used to record voice into the computer.
- 54. Video input • Webcam is an input device used to inputting the video into the computer. Webcam are commonly used for video chat. Webcam are also used to record video into the computer.
- 55. SCANNER • Scanner is an input device used to insert a picture into the computer. This is a peripheral device that converts a printed image into digital information. There are two types of scanners:
- 56. FLAT BED SCANNER • A flat bed scanner uses a flat surface just like photocopier. We can place a picture on the surface of the scanner:; scanner scans the image and convert into digital form. The picture can be seen on the monitor screen after scanning.