Hardware Devices

Mouse
used to move acrross GUI(graphical user interface) It works by a laser detecting the movement of the mouse on the X and Y axis.

Keyboard
Used to enter text onto the computer. An electric current continually sans the keys so when a key is pressed the circuit at that part is broken. This leads to the command of the binary digits for that key being put on the screen.

Bar Code Reader
A device used for reading bar codes. A laser scans the bar code and ot is reflected back into the scanner. The reader then searches through a list of ther barcodes to search for a match. Upon finding a match it finds the item that goes with it.

Scanners
A flatbed scanner reflects light off of the object placed on top of the scanner and a mirror image is produced. A cover is used to remove other light sources. Colour scanners use a variety of lights to scan the colours effeciently.

Magnetic Strip reader
A magnetic strip reader reads the orientation of different magnetic pieces placed inside a plastic strip. The two different orientations gives us the 0 and 1s required to give us a binary number.