1. Standard Methods
of Input

2. This lesson includes the following sections:
The Keyboard
The Mouse
Variants of the Mouse

3. The Keyboard The Standard Keyboard Layout Ergonomic Keyboards
How a Keyboard Works

4. The Keyboard - Standard Keyboard Layout
A standard computer keyboard has about 100 keys.
Most keyboards use the QWERTY layout, named for the first six keys in the top row of letters.

5. The Keyboard - Standard Keyboard Layout
Most keyboards have keys arranged in five groups:
Alphanumeric keys
Numeric keypad
Function keys
Modifier keys
Cursor-movement keys

6. ACADEMIC RECORDS
Password ENTER
* * * * *
Invalid Password

7. The Keyboard - Ergonomic Keyboards
Long periods of keyboard use can cause injuries.
An ergonomically correct keyboard can help you avoid injuries.
You also can avoid injuries by adopting correct
keyboarding practices.

9. The Keyboard - How a Keyboard Works
When you press a key:
The keyboard controller detects the keystroke.
The controller places a scan code in the keyboard buffer,
indicating which key was pressed.
The keyboard sends the computer an interrupt request, telling the CPU to accept the keystroke.

11. The Mouse
What is a Mouse?
Mouse Techniques

12. The Mouse - What is a Mouse?
The mouse is a pointing device. You use it to move a
graphical pointer on the screen.
The mouse can be used to issue commands, draw,
and perform other types of input tasks.

13. The Mouse - Mouse Techniques
Using the mouse involves five techniques:
Pointing; Move the mouse to move the on-screen pointer.
Clicking; Press and release the left mouse button once.
Double-clicking; Press and release the left mouse button twice.
Dragging; Hold down the left mouse button as you
move the pointer.
Right-clicking; Press and release the right mouse button.

14. Variants of the Mouse
Trackballs
Trackpads
Integrated Pointed Devices

15. Variants of the Mouse - Trackballs
A trackball is like a mouse turned upside-down.
Use your thumb to move the exposed ball and your fingers to press the buttons.
Many styles of trackball are available.

16. Variants of the Mouse - Trackpads
A trackpad is a touch-sensitive pad that provides the same functionality as a mouse.
To use a trackpad, you glide your finger across its
surface.
Trackpads provide a set of buttons that function like
mouse buttons.

18. Alternative Methods
Of Input

19. This lesson includes the following sections:
Devices for the Hand
Optical Input Devices
Audio-Visual (Multimedia) Input Devices

20. Alternative Input Devices – Devices for the Hand
Pens
Touch Screens
Game Controllers

21. Devices for the Hand - Pens
With a pen-based system, you use an electronic pen to write on the screen and choose commands.
Pens are common input devices for handheld computers, like “personal digital assistants (PDAs).”
Pens are handy for making notes or selecting
commands, not for inputting a lot of text.

22. The user can point, tap, draw and write on the computer’s screen with a pen.

23. Devices for the Hand - Touch Screens
Touch-screen systems accept input directly through the monitor.
Touch screens use sensors to detect the touch of a finger. They are useful where environmental conditions prohibit the use of a keyboard or mouse.
Touch-screen systems are useful for selecting options from menus.

25. Devices for the Hand - Game Controllers
The two primary types of game controllers are joysticks and game pads.
Game pads usually provide controls for each hand.
Joysticks are popular for flight simulator and
driving games.

26. Alternative Input Devices – Optical Input Devices
Bar Code Readers
Image Scanners and OCR

27. Optical Input Devices - Bar Code Readers
Bar code readers can read bar codes—patterns of printed bars.
The reader emits light, which reflects off the bar code and into a detector in the reader. The detector translates the code into numbers.
Flatbed bar code readers are commonly found in supermarkets. Courier services often use handheld readers.

28. Bar code readers commonly track sales in retail stores

29. Optical Input Devices – Image Scanners and OCR
Image scanners digitize printed images for storage and manipulation in a computer.
A scanner shines light onto the image and interprets the reflection.
Optical character recognition (OCR) software translates image into text that you can edit

30. Alternative Input Devices – Audio-Visual (Multimedia) Input Devices
Microphones and Speech Recognition
Video Input

31. Audio-Visual (Multimedia) Input Devices - Microphones and Speech Recognition
Microphones can accept auditory input. A microphone requires a sound card in the PC.
A sound card can digitize analog sound signals, and convert digital sound signals to analog form.
With speech recognition software, you can use your microphone to dictate text, navigate programs, and choose commands.

32. Analog Sound Signals .

33. Audio-Visual (Multimedia) Input Devices – Video Input
PC video cameras digitize full-motion images.
These cameras break images into pixels and store data about each pixel as digital code.
Video images may be compressed to use less memory and storage space.
Digital cameras capture still images.