Introduction to computer Input Devices
• A device that can be used to insert data into a computer or
any other computational device.
• Any hardware device that send a data to the computer,
without any input device, a computer would be a display
device and not allow user to interact.
• Computer works with an input commands an the input
given by the computer.
• These inputs are given in different ways by using different
kinds of input devices.
• These devices makes the user interface easy and quick.
• These devices are easy to use and gives quick result.
TYPES OF INPUT DEVICES
• Pointing devices
• Composite devices
i. Game controller
ii. Gamepad (or joypad)
• Imaging and Video input devices
i. Digital camera
iii. Image scanner
iv. Fingerprint scanner
• A 'keyboard' is a human interface device which is
represented as a layout of buttons.
• Each button, or key, can be used to either input a
linguistic character to a computer, or to call upon a
particular function of the computer.
• Traditional keyboards use spring-based buttons,
though newer variations employ virtual keys, or
even projected keyboards.
• A pointing device is any human interface device that
allows a user to input spatial data to a computer.
• In the case of mice and touch screens, this is usually
achieved by detecting movement across a physical
• Analog devices, such as 3D mice, joysticks, or pointing
sticks, function by reporting their angle of deflection.
• Movements of the pointing device are echoed on the
screen by movements of the pointer, creating a simple,
intuitive way to navigate a computer's GUI.
• Input devices, such as buttons and joysticks, can be
combined on a single physical device that could be
thought of as a composite device. Many gaming devices
have controllers like this. Technically mice are
composite devices, as they both track movement and
provide buttons for clicking, but composite devices are
generally considered to have more than two different
forms of input.
• A game controller is a device used with games or
entertainment systems to provide input to a video game,
typically to control an object or character in the game.
• A controller is usually connected to a game console or
computer by means of a wire or cord, although wireless
controllers are also widespread.
• Input devices that have been classified as game controllers
include keyboards, mice, game pads, joysticks, etc.
• Special purpose devices, such as steering wheels for driving
games and light guns for shooting games, are also game
Gamepad (or joypad)
• A gamepad (also called joypad or control pad), is a type
of game controller held in two hands, where the fingers
(especially thumbs) are used to provide input.
• Gamepads generally feature a set of action buttons
handled with the right thumb and a direction
controller handled with the left.
• The direction controller has traditionally been a four-
way digital cross (also named a joypad, or alternatively
a D-pad), but most modern controllers additionally (or
as a substitute) feature an analog stick.
Imaging and Video input devices
• Video input devices are used to digitize images or video
from the outside world into the computer.
• The information can be stored in a multitude of
formats depending on the user's requirement.
• A digital camera (or digicam) is a camera that takes
video or still photographs by recording images on an
electronic image sensor.
• Most cameras sold today are digital, and digital
cameras are incorporated into many devices ranging
from PDAs and mobile phones (called camera phones)
• A webcam is a video camera that feeds its images in
real time to a computer or computer network, often via
USB, ethernet, or Wi-Fi.
• Their most popular use is the establishment of video
links, permitting computers to act as videophones or
• The common use as a video camera for the World Wide
Web gave the webcam its name.
• In computing, an image scanner—often abbreviated to just
scanner—is a device that optically scans images, printed
text, handwriting, or an object, and converts it to a digital
• Common examples found in offices are variations of the
desktop (or flatbed) scanner where the document is placed
on a glass window for scanning.
• Hand-held scanners, where the device is moved by hand,
have evolved from text scanning "wands" to 3D scanners
used for industrial design, reverse engineering, test and
measurement, orthotics, gaming and other applications.
• Hand-held scanners, where the device is moved by
hand, have evolved from text scanning "wands" to 3D
scanners used for industrial design, reverse
engineering, test and measurement, orthotics, gaming
and other applications.
• Mechanically driven scanners that move the document
are typically used for large-format documents, where a
flatbed design would be impractical.
• Fingerprint recognition or fingerprint authentication
refers to the automated method of verifying a match
between two human fingerprints.
• Fingerprints are one of many forms of biometrics used
to identify individuals and verify their identity.
• This article touches on two major classes of algorithms
(minutia and pattern) and four sensor designs (optical,
ultrasonic, passive capacitance, and active
• By using these input devices the user can do it work
with much ease and effectively.
• An output device is any piece of computer hardware
equipment used to communicate the results of data
processing carried out by an information processing
system (such as a computer) which converts the
electronically generated information into human-
• Computer speakers, or multimedia speakers, are
speakers external to a computer, that disable the lower
fidelity built-in speaker.
• They often have a low-power internal amplifier. The
standard audio connection is a 3.5 mm (approximately
1/8 inch) stereo jack plug often color-coded lime green
(following the PC 99 standard) for computer sound
• A plug and socket for a two-wire (signal and ground)
coaxial cable is widely used to connect analog audio
• Headphones are a pair of small loudspeakers that are
designed to be held in place close to a user's ears.
• Headphones either have wires for connection to a signal
source such as an audio amplifier, radio, CD player,
portable media player or mobile phone, or have a wireless
receiver, which is used to pick up signal without using a
• The in-ear versions are known as earphones or earbuds.
• A monitor or display (also called screen or visual
display unit) is an electronic visual display for
• The monitor comprises the display device, circuitry,
and an enclosure.
• The display device in modern monitors is typically a
thin film transistor liquid crystal display (TFT-LCD)
thin panel, while older monitors use a cathode ray tube
(CRT) about as deep as the screen size.
• In computing, a printer is a peripheral which produces
a representation of an electronic document on physical
media such as paper or transparency film.
• Many printers are local peripherals connected directly
to a nearby personal computer.
• Network printers have built-in network interfaces can
serve any user on the network.
• Individual printers are often designed to support both
local and network connected users at the same time.
• The plotter is a computer printer for printing vector
• In the past, plotters were used in applications such as
computer-aided design, though they have generally
been replaced with wide-format conventional printers.
• It is now commonplace to refer to such wide-format
printers as "plotters," even though they technically are