Discovering Different Peripheral Devices Computer Science Essay

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Some keyboards have USB ports so can plug a USB device directly in the keyboard instead of in the system unit. Some keyboards also include a fingerprint reader or smart card reader. Desktop computer keyboards often attach via a cable to a USB port on the system unit. However, some keyboards do not have any wires connecting the keyboard to the system unit. A wireless keyboard (Figure 1.2), or cordless keyboard, is a battery-powered device that transmits data to the system unit using wireless technology, such as radio waves (Bluetooth) or infrared light waves (IrDA)(Figure 1.3).

Apple%20Wireless%20Keyboard Figure1.2 Wireless keyboard

ibiz_vkb Figure 1.3 Infrared Light Keyboard

Furthermore there is an ergonomics keyboard which it has a design that reduces the chance of wrist and hand injuries (Figure 1.4). Mobile computers and mobile devices also have keyboards. On notebook computers and some handheld computers, smart phones and other mobile devices, the keyboard is built in the top of the system unit. A typical device usually has only 85 keys, fewer keys than desktop computer keyboard.

Figure 1.4 An ergonomics keyboard Figure1.5 Mini keyboard 1.2 Mouse

Mouse is a small device that a computer user pushes across a desk surface in order to point to a place on a display screen and to select one or more actions to take from that position which is fits under palm of a hand. With a mouse, user controls the cursor on the screen and is responsible for providing interactive feedback with the left or right button located on the mouse itself. There are many types of mouse available such as mechanical mouse, optical mouse, trackball mouse and also wireless mouse.

Scanner is a light-sensing device that reads printed text, photograph and graphics from paper which are then changed into bit patterns for processing, storage, or output. With these devices, users do not type, speak, or write into the computer instead scanner capture data from a source document which it is the original form of the data for examples order forms, time cards, invoices, advertisements, pay checks, brochures, photos, inventory tags, or other document contains data to be processed. Through the applications of scanners vary each requires specific software to convert data to binary code. Devices that have same function as scanner are optical scanners, bar code readers, optical readers, magnetic stripe card readers, RDIF readers and magnetic-ink character recognition readers.

Scanner

Method of Scanning and Usage

Scannable Items

Flatbed

Description: http://www.prlog.org/10536774-flatbed-scanner.jpg

Similar to a copy machine

Pictures

Single-sheet documents

Bound material

Pen or Handheld

Description: http://portuguese-dictionary.ectaco.cz/images/dictionary/iTRAVL_and_Cpen_white.gif

Can scan a few lines of text or a small photo in one sweep.

Applicable for mobile users, students and researchers.

Any printed text

Sheet-Fed

Description: http://cliparts101.com/files/990/C452E344153CBEC156340F6D593D3DF5/lrg_Sheet_Fed_Scanner.png

Come in different sizes.

Item to be scanned is pulled into a stationary scanning mechanism.

Single-sheet documents

Pictures

Slides (with an adapter)

Drum

Description: http://2.bp.blogspot.com/_zuTwhXwl9PM/TLdooluLV8I/AAAAAAAAAAM/0k_S9iVlBiU/s1600/howtek_scanmaster_4500.jpg

Item to be scanned rotates and wrapped around stationary scanning mechanism as it rotated.

Expensive.

Used in large business.

Single-sheet documents

Pictures

Posters

1.3.1 Optical Reader

Optical reader are devices that uses a light sources to capture characters, marks and codes, and translates them into digital information that computer can process. Two technologies that optical readers used are optical mark recognition (OMR) and optical character recognition (OCR).

1.3.1.1 Optical Mark Recognition (OMR)

Optical mark recognition is handwritten characters and marks which can be read with scanners and specialized software. It sense the presence of a pencil mark by the way light reflects off of it. OMR uses is useful for large numbers of hand-filled forms need to be processed fast and with great accuracy examples like standardized tests, reply cards, surveys, and questionnaires answer sheet. In some of the forms, it can differentiate check marks, plus and minus sign and other symbols. (Figure 1.3.1.1 )

Description: http://www.swm-group.co.uk/data-capture/img/omr.jpg Figure 1.6 Example of answer sheet form.

1.3.1.2 Optical Character Recognition (OCR)

Optical character recognition is a technology that involves computer or hand printed character and reading typewritten from ordinary documents and convert to form that can be recognized and manipulated by a word-processing program as alphabets, numerals and words. It is also available for personal computers as well as libraries to preserve and digitize their holdings. Other common uses of optical character recognition include processing checks and letter sorting by the postal office.

Description: http://www.fontmarketplace.com/images/products/OCR01-01-01-01-m.jpg

Figure1.7 Character in OCR font Figure 1.8 Turnaround document

However many companies using optical character recognition on turnaround documents. It is a document that being return to the company that creates and sends it. Examples, consumers will receive a bill, they often will tear off a portion of the bill and send it back to the company with their payment (Figure 1.9). The portion of the bill that they usually return has their payment amount, account number, and other information printed in optical character recognition characters.

1.3.2 Bar Code Readers

Bar code readers are electronic devices that scan barcodes by shining a sensitive laser beam on it. The readers then translate the reflected light into digital data that being transferred to computer for immediate action or storage. Bar code readers also called as price scanner or point-of-sale (POS) scanner. It consist small image of lines bars and spaces that affixed to such as identification cards, inventory in retail store, to track shipping and manufacturing movement, to check out books from a library, to sign on a job and also to identify hospital patients.

Description: http://scan-it.com.ua/assets/images/statti/scaneri_ruchniye/barcode-scanner.jpg Figure 1.9 Bar Code Reader and bar codes

1.4 Game Controllers

Game controllers are use when playing video or computer games. It is the input device that leads the movement and actions of on-screen object. There are many types of game controller such as gamepads, light guns, joystick and wheels, dance pads and also motion-sensing controllers.

1.4.1 Gamepads

Hold it with both hands to controls the action and the movement of players or object in computer or video game.

Press the button with thumbs or move the stick in many directions to trigger events.

Communicate with personal computer by wired or wireless technology or with a game console.

gamepad Figure 1.10 Example of gamepad

1.4.2 Light Gun

It is used to shoot moving object and target after user pull the trigger on the weapon.

Most light guns work by defecting light.

Attach by a cable to a game console or personal computer.

lg-gcon Figure 1.11 Example of light gun

1.4.3 Joysticks and Wheels

Usually used when running game software of driving simulation and flight.

Joystick is a handheld vertical lever mounted on a base.

User moves the lever in different ways to control the actions of the simulated player or vehicle.

Usually includes buttons called trigger that press to initiate events.

It also has additional buttons press to perform other actions.

414X2Z0A7TL racing-wheel-joystick-with-programmable-analog-gas-4804-1

Figure 1.12 Example Joysticks Figure1.13 Example of Wheel

Computer Output

Printer

Printer is external device that accepts text and graphic output which a user sees on a computer and transfer the information to paper. It uses small pixels to transfer the information from the system to another surface and the result will be in hard copy or print out. Printer got two types of orientations which are portrait and landscape. There is nonimpact printer, which it forms graphics and characters without using an inked ribbon or striking the paper. Examples of nonimpact printer are ink-jet printer, laser printer, photo printer, mobile printer, thermal printer and label printer.

Example of Printer

Explanation

Ink-jet printer

inkjet-printer

Common type of printer used by home users or small businesses

Prints in black and white or colour on any types of paper

Sprays tiny drops of liquid ink onto the paper.

Laser printer

hp-laserjet-1300-laser-printer-review

It prints graphics and text in very high quality resolution

High speed and quality nonimpact printer

Cost more than ink-jet printer but more faster

Photo printer

roller_printer2

Use dye sublimation for high quality printing

Produce photo-lab-quality pictures

Mobile printer

mobile_printer

Small, battery-powered, light weight

Allow mobile user to print information from tablet PC, notebook computer or PDA while travelling.

Thermal printer

seiko-dpu-s445-mobile-thermal-printer

Produce images by pushing electrically heated pins against the heat sensitive paper

Use heat also to transfer dye sublimation to specially coated paper

Label printer

brother-ql-570-label-printer

Most print bar codes

Built-in digital scale and prints stamps

Small printer that prints on adhesive type material

2.2 Speaker and Headphones

Speaker and headphones are audio output devices. It is a device of a computer that produce speech, music or other sound such as beeps. Speakers usually have volume and tone controls that allows the users to adjust the settings. Other than that, anyone is in listening distance, they can hear the output because most surround sound computer speakers system include one or two center speaker and also two or more satellite speakers that are positioned so that sound emits from all directions.

111 Figure 1.14 Speakers

Headphones have the same function as the earbuds. Only the individual wearing the device can hear the sound from the computer. The headphones are placed outside of the ear, different from the earbuds which are rest inside the ear canal. Both headphones and earbuds usually include noise-cancelling technology to reduce the interference of sounds from the surrounding environment.

dj-headphones_48 Figure 1.15 Headphones

Question 2

3.0 Storage

Storage is where users keep or hold data, information, and instructions for future use. Every computer stores system software and application software. Home users also use storage to save data documents, music, and many more. Office or business users use storage to keep, their transaction and other office related records.

Home user storage device.

3.1.1 Home user storage that available:

80 hard disk

Online storage

CD or DVD drive

Card reader or writer

USB flash drive or 3.5 inch floppy disk drive

3.2 Business user storage device

3.1.2 Business user storage that available:

750 MB zip drive

120 GB hard disk

Online storage

CD or DVD drive

External hard drive for backup

USB flash drive or 3.5 inch floppy disk drive

Mobile user storage device

3.2.1 Mobile user storage that available:

80 GB hard disk

Online storage

CD or DVD drive

Card reader or writer

Portable hard disk for backup

USB flash drive or 2 GB PC Card hard disk or 3.5-inch floppy disk drive

Power user storage device

3.3.1 Power user storage that available:

CD or DVD drive

300 GB hard disk

Online storage

Portable hard disk for backup

USB flash drive and/or 3.5-inch floppy disk drive

Large business user storage device

3.4.1 Large business user storage that available:

Desktop computer

160 GB hard disk

CD or DVD drive

Smart card reader

Tape drive

USB flash drive and/or 3.5-inch floppy disk drive

Server or Mainframe

Network storage server

40 TB hard disk system

CD-ROM or DVD-ROM server

Microfilm or microfiche

CONCLUSION

This is my first assignment of Information Technology Introduction subject. I found that this project was challenging and I have discovered more technology informations which are something new to me. This assignment will be a useful tool for my reference in enhancing my knowledge in information technology.

I have completed both given topic questionnaires which are peripheral devices and storage. In peripheral devices, I have discovered that there are many different types of components which are available in the market. As for storage, I have learned that informations can be kept in many different ways depending on the capacity of the usage.

Moving forward, as rapid growth globally in information technology, I am ready to widen my knowledge by learning and exploring more in this subject. This subject is very interesting and useful to learn as nowadays job recruitments and requirements are very much dependent on information technologies.

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