series of bars that give information on the product when scanned. this is an automated input devices.
magnetic stripe reader
Series of the bars that give information on the product when scanned. This is an automated input devices.
mouse
This is a pointing devices which contains a roller in its base. When the mouse is moved on any surface, the pointer on the screen is also moved. it contains a potentiometer coupled with the roller. This potentiometer senses the motion of the mouse and convert it into digital value, A mouse may contain two or three buttons. Now a days optical mouse are very popular.
Scanner
Series of the nars that give information of the product when scanned. this is an automated input devices.
Keyboard
This is most commonly used device which acts as input device. Its structire is like typewriter. It contains no. of key which have some specific ASCII values. like 'A' has ASCII value 65. When this is pressed, it is converted into 65 and this 65 is sent to CPU in yhr form of binary language (i.e 10000001). Then operations are done on this data.