Mouse
• The computer mouse is considered an input
device.
• With a click of a button, the mouse sends
information to the computer.
• • It looks like real mouse with the cord is the
tail and the part we hold is the body.
types
• Mechanical
• Opto-mechanical
• Optical
Basic parts of a mouse
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A ball
two rollers
An LED and a sensor
On board processor chip
A shaft
Optical Mouse
• Developed by Agilent technologies in 1999
• Uses a camera that take 1500 pictures every
second
• Working:
• Optical mouse has a small and red lightemitting diode (LED)
• It bounces light off the surface onto a
(complimentary metal oxide semiconductor)
CMOS sensor.
• The CMOS sensor sends each image to a
digital signal processor for analysis
• DSP is able to detect patterns in the images
and it checks how the pattern is moved with
respect to the previous one
• Based on the change , the DSP determines
how far the mouse has moved and sends the
co-ordinates to the computer
• The computer moves the cursor on the screen
based on the coordinates received from the
mouse.
• This happens hundreds of times each second,
making the cursor appear to move very
smoothly.
Advantages
• 1.Able to work on almost any surface
• 2.No moving parts means less wear and a
lower chance of failure
• 3.There's no way for dirt to get inside the
mouse and interfere with the tracking sensors.
• 4.Increased tracking resolution means
smoother response.
• 5.They don't require a special surface, such as
a mouse pad
connectors
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Serial
PS/2
USB
wireless
serial
• The serial mouse was connected to the computer via the serial port.
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A serial port is a physical communication interface through which
information is transferred in and out of the computer bit by bit.
• The serial port is a D-type 9 pin male port (DB9M) at the back of the
motherboard. Its corresponding connector must then be a female connector
for them to mate correctly.
• The serial mouse is obsolete.
PS/2 mouse
• The PS/2 mouse is connected to the PS/2 port
(green in colour).
• The PS/2 mouse connector is a 6-pin mini-din
connector designed in 1987.
• It superseded the serial connectors. Its name is
derived from IBM's personal systems/2 series of
personal computers, which were introduced in
1987.
USB mouse
• The physical shape and appearance of the USB
mouse are similar to the others.
• The only difference is the connector that connects to
a USB port on the back of your PC.
• The USB port also provides power to the attached
device hence eliminating the need for power
connectors.
• The USB ports support hot-plugging where you
connect or remove a device without turning off your
computer.
Wireless mouse
• This is the latest type of mouse that does not use a cable to
connect to the back of your computer.
• It is a neat type of mouse to use because it eliminates the
clutter of cables on your desktop.
• wireless mice use radio frequency (RF) technology to send
information to computer.
• Radio Frequency devices require two main components in
order to communicate; a transmitter and a receiver.
• The transmitter is housed in the mouse and it is powered by a
battery that will be found on the underside of the mouse
compartment.
• The transmitter sends an electromagnetic
(radio) signal that encodes the information
about the mouse's movements and the
buttons you click.
• On the other hand, there is a receiver
connected to your computer.
• It accepts the signal, decodes it and passes it
on to the mouse driver software and your
computer's operating system.
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Features:
Comfortable Ergonomic Design
Save Battery Life
Plug and play -no need for any drivers
Wide Compatibility