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Input Peripherals Coursework

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Input Peripherals Report - Computing Bar Code Readers Bar code readers are used almost everywhere in everyday life - the purpose of the input peripheral is to scan a barcode which contains information specific to the particular item being read. Once the item has been scanned, it may indicate that it has a certain value - if used at a supermarket checkout for example. The bar code reader works by emitting light at a precise frequency at the bar code, then a photodiode inside the bar code reader is used to measure the intensity of light reflected back from the bar code. Bar code readers appear in three forms, handheld for semi-automatic reading, fixed mount for automatic reading and reader gates which are typically used in industry to scan thousands of items per hour. The advantages of barcode readers are: Speed, in that a bar code label of twelve characters can be read in approximately the time it takes a keyboard operator to make two keystrokes. Also bar code readers are much more accurate than typing: for every 1,000 characters typed by a keyboard operator, there is an average of ten keying errors. ...read more.


The purpose of the input device is to store information on the black magnetic stripe on the card. This can be financial - for credit cards, or simply a code - in the case of hotel room doors. The magnetic stripe on the back of the card can be "written" because the tiny bar magnets can be magnetized in either a north or South Pole direction. It is very similar to a piece of cassette tape fastened to the back of a card. Instead of motors moving the tape so it can be read, your hands provide the motion as you "swipe" a credit card through a reader or insert it in a reader at the gas station pump. The advantages of swipe cards are that they are easy to use, and finance is usually available interest free for the first month. Swipe cards avoid the need to carry around large amounts of cash (if they are credit cards) or provide identification etc. Disadvantages are that unscrupulous shop checkout staff could swipe the card through a machine which could capture your details, and then could be used to take money out of your bank account. ...read more.


Digitiser (Graphics Tablet) A digitiser or graphics tablet is a computer input device that allows the user to hand-draw images and graphics, similar to the way we draw with a pen and paper. A graphics tablet consists of a flat surface upon which the user may "draw" an image using an attached stylus. The image generally does not appear on the tablet itself but, rather, is displayed on the computer monitor. Some tablets are intended as a general replacement for a mouse as the primary pointing and navigation device for desktop computers. Graphics tablets work by using a lattice of wires which are just underneath the tablet surface, which pick up signals from the stylus and co-ordinate its position and on some models, the pressure that the user is using on the tablet. The advantages of this input method are that drawings and sketches can automatically be converted to a digital translation without having to use a scanner, etc. It is much more accurate than touch sensitive screens, and is more natural to use. However, the disadvantages are that graphics tablets are generally quite expensive for the average user, with large sized tablets often costing hundreds of pounds. ?? ?? ?? ?? Page | 1 ...read more.

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