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Presentation OnTRACKBALL

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Presented by..

Mrinal Mitra

RNo:121514

ME-MOD(IC)-12

3rd SPELL

DEPARTMENT of ELECTRICALENGINEERING, NITTTR,

CHANDIAGRH

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Contents Introduction

History

Working Principle

Advantage

Disadvantage

Applications

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Introduction A trackball is a pointing input device

consisting of a ball held by a socket

containing sensors to detect a rotation of

the ball about two axeslike an upside-down mouse with an exposed protruding

ball.

The user rolls the ball with the thumb,

fingers, or the palm of the hand to move a

cursor.

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History Of Trackball The trackball was invented by Tom Cranston andFred Longstaff in 1952, eleven years before the

mouse was invented.

Before the advent of the touchpad, small

trackballs were common on portable computers,

where there may be no desk space on which to

run a mouse. Some small thumbballs clip onto the

side of the keyboard and have integral buttons

with the same function as mouse buttons.

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Figure 1:Worlds First Track Ball

(Invented by Tom

Cranston & Fred

Longstaff)

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Working on the Royal Canadian Navys

DATAR project in 1952. It used a

standard Canadian five-pin bowling

ball.

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Working PrincipleA trackball consists of a stationary

hand rest, which is usually larger than

a mouse, that contains a round track

ball set in a socket, which allows it torotate freely. We can rotate the ball

with our thumb, and sensors detect

movement along two perpendicularaxes, which, in turn, move the pointer

on the screen.

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Figure 2:

Block Diagram

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Figure 3: Internal Diagram

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Figure 4:

Trackball Frame

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origin at the center ofball

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Figure 5: Different

types of Track Balls

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Advantages Of Trackball If space is of minimal quantity, the traditional

mouse needs to roam and needs its own mouse

pad to travel, a track mouse needs neither.

The buttons are also placed well so your fingers

are not stressed in reaching for them. Trackballs tend not to get as dirty as mice

because only the thumb comes in contact with

the ball. The trackball is easily removed and can

be rubbed clean with a piece of cloth.

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Advantages of Trackball

(contd..)At times when a user is browsing

menus or websites rather than

typing, it is also possible to hold a

trackball in the hand like a televisionremote control, operating the ball

with the right thumb and pressing the

buttons with the left thumb, thusgiving the fingers a rest.

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Advantages of Trackball

(contd..) Elderly people sometimes have difficulty

holding a mouse still while double-

clicking; the trackball allows them to let

go of the cursor while using the button.

Trackball mice come in all sizes as per

users needs.

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Disadvantages of

Trackball Trackballs are by their natureasymmetric. Thumb-operated

trackballs are not generally

available in left-handedconfigurations, due to small

demand.

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Disadvantages of

Trackball(contd..)

Trackballs tend not to skip and flow

more smoothly than mice or touch

pads, but mice are often easier tomanipulate quickly and accurately.

Some users incur unacceptablefatigue of the thumb.

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Special Applications

Large tracker balls are sometimes seen oncomputerized special-purpose workstations,such as the radar consoles in an air-trafficcontrol room or sonar equipment on a ship orsubmarine.

Military mobile anti-aircraft radars andsubmarine sonar tend to continue usingtrackballs, since they can be made more durableand more fit for fast emergency use.

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(contd..)

Computer gamers have been able to

successfully use trackballs in most moderncomputer games with any slight loss of speedcompensated for with an increase in precision.

Trackballs have also been regarded as

excellent complements to analog joysticks.This provides for two-hand aiming and a highaccuracy and consistency replacement for thetraditional mouse and keyboard.

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(contd..)

Trackballs are provided as the pointingdevice in some public internet access

terminals. Unlike a mouse, a trackball can

easily be built into a console, and cannot

be ripped away or easily vandalized. Thissimplicity also makes them ideal for use in

industrial computers.

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(contd..)

Some mobile phones, one of them is BlackBerryPearl feature trackballs. These miniature

trackballs are made very small to fit within the

thickness of a mobile device, and are controlled

by the tip of a finger or thumb.

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Trackball

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Major manufacturer

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Three major companies Logitech, A4Tech and Kensingtoncurrently produce trackball, although A4Tech has not released

a new model in several years.

Microsoft was a major producer, it named its trackball as

EASYBALL.

However, has since discontinued all of its products.

Kensington trackball

A4Tech trackball

Logitech trackball

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PROBABLE QUESTIONS

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1. List out the different pointing devices used.

Explain each of them.

(15/100). Dec 2005

2. A PC is built from fundamental elements

combined together- Discuss.

(13/100),Dec 2006

3. Explain any two input devices used in a PC.

(15/100),Dec 2008

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Thank You

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