Created by –RAUNAK SODHI

(BCA 1st year)

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

• Keyboards• Pointing devices• Composite devicesi. Game controllerii. Gamepad (or joypad)• Imaging and Video input devicesi. Digital cameraii. Webcamiii. Image scanneriv. Fingerprint scanner

Keyboards

• 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.

Pointing devices

• 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 surface.

• 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.

Composite devices

• 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.

Game controller

• 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 controllers.

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.

digital camera

• 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) to vehicles.

Webcam

• 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 videoconference stations.

• The common use as a video camera for the World Wide Web gave the webcam its name.

Image scanner

• 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 image.

• 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 scanner

• 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 capacitance).

Conclusion

• By using these input devices the user can do it work with much ease and effectively.

Output device

• 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-readable form.

Types of Output Devices• Speakers• Headphones• Screen (Monitor)• Printer• Projector• Plotter

Computer speaker

• 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 cards.

• A plug and socket for a two-wire (signal and ground) coaxial cable is widely used to connect analog audio and video components.

Headphones

• 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 cable.

• The in-ear versions are known as earphones or earbuds.

Computer monitor

• A monitor or display (also called screen or visual display unit) is an electronic visual display for computers.

• 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.

Printer

• 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.

Plotter

• The plotter is a computer printer for printing vector graphics.

• 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 not.