INPUT DEVICES
KEYBOARD
This is most commonly used device which
acts as input device. Its structure is like typewriter.It contains no. of
keys which have some specific ASCII values. Like ‘A’ has ASCII value 65. When
this is pressed , it is converted into 65 & this 65 is sent to CPU in the
form of Binary language (i.e. 1000001). Then operations are done on this data.
This is most commonly used device which
acts as input device. Its structure is like typewriter.It contains no. of
keys which have some specific ASCII values. Like ‘A’ has ASCII value 65. When
this is pressed , it is converted into 65 & this 65 is sent to CPU in the
form of Binary language (i.e. 1000001). Then operations are done on this data.
MOUSE
This is a pointing device 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 mouse & convert it into digital value. A mouse may contain two or
three buttons.
Now a day's optical mouse are very popular
Now a day's optical mouse are very popular
BAR CODE READER
It is a device which is used to read the code from the products which
are usually in the form of Bars. It contains a light sensitive detector which
identifies the values of the bars on the product & converts them into
numeric code.These Bar readers are used in Shopping malls in
a very large scale
DIGITAL CAMERA
As the name specifies, these camera stores the data digitally, which
then can be stored in the computer & can be stored for a long time. But it
has very limited storage capacity. These are very popular because of less
expensive photographs & Speed
LIGHT PEN
It is a pointing device which contains a photocell mounted at its tip.
It senses the light from the screen when it becomes closer to the screen, &
generates a pulse. So for identifying a particular location on the screen these
light pens are very useful. But this is not in very much use these days
SCANNER
The scanner is an input device like the photocopier machine which makes
the electronic copy of the picture or document which can be further edited
MIC's or MICROPHONES
The scanner is an input device like the photocopier machine which makes
the electronic copy of the picture or document which can be further edited
