Input Devices Flashcards
Are entered into the computer through input devices such as the keyboard, disks, or through other computers via network connections or modems connected to the Internet.
Input Information and Programs
Are used to enter data and instructions into computer memory from external world.
Input Devices
Examples of Input Devices
Keyboard
Mouse
Track ball
Track Pad
Joy stick
Touch Screen
Light pen
Touch Screen
Scanner
Digital Camera
Microphone
Graphics tablet
Three Main Functions of Input Devices
- Receive data from user.
- Convert data into binary form [The language of 0 and 1 also called the machine language. Machine language is the only language, a computer can understand directly.]
- Provide converted data to computer memory for processing.
The most familiar input device. It is most widely used input device to enter data and instructions into the computer. It has a set of keys like a typewriter.
Keys: Alphabetic, numeric, function, editing.
Keyboard
- A device for pointing (controlling input positioning) on a computer display screen.
- It is an alternative to the mouse.
- Works by sensing the user‘s finger movement and downward pressure.
Touch Pad
The first touch pad was invented by ______ _________ and the _____ ________ was the first to license and use the touch pad in its power book laptops.
George E. Gerpheide (1988)
Apple computer (1994)
The mouse was invented in 1966 by _______ _________.
Douglas Engelbart
It is used to control the movement of the pointer to select items on a display screen.
Pointing Input Devices
Examples of Pointing Input Devices
Mouse
Track ball
Joystick
Pointing Stick
Graphic Tablet
Touch Pad
Touch Screen
Light pen
- Like an upside down mouse.
- Used in Laptop computers to control motion of pointers on screen.
- This ball is moved by fingers or thumb and the pointer moves accordingly on screen.
Track Ball
An input device used to play games on a computer.
Joystick
- A pressure sensitive small nub (similar to pencil eraser).
- between the G, H, and B keys
- operates by sensing the pushing force applied by the user
Pointing Stick
- Consists of a special pen called stylus and a flat pad.
- The image is created on the monitor screen as the user draws it on the pad with the help of a stylus.
Graphic Tablet
- In ATM and in latest smart phones, _____ ______ is used to receive input from the user.
- The user enters data by the touch of his finger on different menu options or icons present on the touch screen.
Touch Screen
- Consisting of a special pen that is connected to a computer’s monitor.
- The user points at the screen with the pen and selects items or chooses commands.
Light Pen
Data Scanning Devices are input devices, which are used for direct entry into the computer system from source documents.
Scanning Input Devices
It is input devices used for direct data entry into the computer system from source documents.
Data Scanning Devices
- Translates paper documents (text, pictures, handwritten) into electronic format for computer storage.
- Stored in a computer and can be displayed or printed
Image Scanner
- Like a copy machine with a glass plate.
- Document placed upside down, light scans horizontally.
- After scanning one line the light beam moves up.
- This process is repeated for all the lines.
Flatbed Scanner
- Dragged across document.
- Less accurate than flatbed. Cheaper.
- Cannot interpret the stored document.
- Required for storing the document.
Hand-held Scanner
What are the TYPES of Data Scanning Devices?
Image Scanner
Flatbed Scanner
Hand-Held Scanner
Purpose: Captures digital photographs.
Storage: Stores photos on memory cards for later transfer to computer.
Resolution: High resolution (e.g., 10+ megapixels).
Audio Visual Input Devices
(Digital Camera)
Purpose: Captures moving images (video).
Storage: Stores videos on tape or memory cards.
Real-time Input: Some video cameras provide direct input for Television production or video conferencing.
Video Camera
Purpose: Captures live video for computer input.
Quality: Lower quality than video cameras.
Usage: Web chats, video calls.
Placement: Often clipped to monitor or built into laptops.
Webcam
Purpose: Converts sound into a signal for computer input.
Signal Conversion: Analogue signal converted to digital by ADC.
Usage: Audio recording, voice commands, communication.
Microphone
It is usually built into the computer‘s sound card
Analogue-to-Digital Convertor (ADC)
It is an electromechanical device that accepts data from the outside world and translates them into a form that a computer can interpret.
Input device
The most commonly used input devices today. They allow data entry into a computer system by pressing an asset of keys (labeled buttons) neatly mounted on a keyboard connected to the computer system.
Keyboard devices
Are sent to the computer via a serial port.
Keyboard scan codes
Built into the keyboard itself.
Keyboard controller
Consists of a number of switches and a keyboard controller.
Keyboard
Records and stores photographic images in digital form that is fed to a computer for viewing and printing.
Digital Camera
