A mouse uses rollers or an optical sensor to detect motion across a surface and translate that into signals a computer can interpret. A mechanical ball mouse uses two freely rotating rollers oriented 90 degrees from each other to detect forward/backward and left/right motion. Each roller is attached to an encoder wheel that interrupts light beams to generate electrical pulses representing movement. Modern optical mice use an LED sensor to detect surface movement and send that information to the computer. The main components of a mouse are those that translate hand motion into usable signals for the computer.

1.  A mouse is a pointing device that functions by
detecting two-dimensional motion relative to its
supp. Mechanical MOUSE
 Mechanical mouse
 Bill English, builder of Engelbart's original
mouse, invented the ball mouse in 1972 working
for Xerox pace.

2.  The ball mouse has two freely rotating rollers.
They are located 90 degrees apart. One roller
detects the forward–backward motion of the
mouse and other the left–right motion.
 The ball is mostly steel, with a precision
spherical rubber surface.The weight of the ball,
given an appropriate working surface.
 This new design incorporated a single hard rubber
mouseball and three buttons, and remained a
common design until the mainstream adoption of
the scroll-wheel mouse during the 1990s.
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3. SUBJECT: INPUT DIVISE
MOUSE

4. Each roller is on the same shaft as an encoder
wheel that has slotted edges; the slots interrupt
infrared light beams to generate electrical pulses
that represent wheel movement.
Each wheel's disc, however, has a pair of light
beams, located so that a given beam becomes
interrupted, or again starts to pass light freely,
when the other beam of the pair is about halfway
between changes.

5.  Optical and Laser mice
Optical mouse uses an LED sensor to detect
tabletop movement and then sends off that
information to the computer.

6. Inside a Mouse
The main goal of any mouse is to translate the
motion of your hand into signals that the
computer can use. Almost all mice today do
the translation using five components:

7. THANKYOU