Fundamentals of ICT
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Input Devices in ICT: Keyboards, Mice, and Other Interfaces, Slides of Information and Computer Technology
An in-depth exploration of various input devices used in information and communication technology (ict), focusing on keyboards, mice, and their ergonomics, as well as other input methods such as touchscreens, multitouch devices, optical input devices, and audiovisual input devices. The functioning, benefits, and ergonomic considerations of these devices, as well as their role in avoiding repetitive strain injuries.
Typology: Slides
2011/2012
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Fundamentals of ICT
Chapter 2
INPUT DEVICES
The Keyboard
- The most common input
device
- Must be proficient with keyboard
- Skill is called keyboarding
The Keyboard
- How a keyboard works
- Keyboard controller detects a key press
- Controller sends a code to the CPU
- Code represents the key pressed
- Controller notifies the operating system
- Operating system responds
- Controller repeats the letter if held
The Mouse
- Interacting with a mouse
- Actions involve pointing to an object
- Clicking selects the object
- Clicking and holding drags the object
- Releasing an object is a drop
- Right clicking activates the shortcut menu
- Modern mice include a scroll wheel
The Mouse
- Benefits
- Pointer positioning is fast
- Menu interaction is easy
- Users can draw electronically
Variants of the Mouse
- Track pads
- Stationary pointing device
- Small plastic rectangle
- Finger moves across the pad
- Pointer moves with the pointer
- Popular on laptops
Variants of the Mouse
- Track point
- Little joystick on the keyboard
- Move pointer by moving the joystick
Ergonomics and Input Devices
- Repetitive Strain Injury (RSI)
- Caused by continuous misuse of the body
- Many professions suffer from RSI
- Carpal Tunnel Syndrome
- Carpal tunnel is a passage in the wrist
- Holds nerves and tendons
- Prolonged keyboarding swells tendons
Carpal Tunnel Syndrome
Ergonomics and Input Devices
- Techniques to avoid RSI
- Sit up straight
- Have a padded wrist support
- Keep your arms straight
- Keyboard properly
- Take frequent breaks
Ergonomics
Devices for the Hand
- Pen based input
- Tablet PCs, PDA
- Pen used to write data
- Pen used as a pointer
- Handwriting recognition
- On screen keyboard
Devices for the hand
- Touch screens
- Sensors determine where finger points
- Sensors create an X,Y coordinate
- Usually presents a menu to users