Transcript Preparacion de la Certificacion A+

Programa de Computación y Tecnología
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Chapter 8:
Module 1:
Peripheral & Input Devices
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8 – Peripheral and Input Devices
Topics to be covered and learned in this chapter
Exam Objectives
 220‐701‐1.8: Install and configure
peripherals and input devices
 Mouse
 Keyboard
 Bar code reader
 Multimedia
(e.g. web and digital cameras, MIDI, microphones)
 Biometric devices
 Touch screen
 KVM switch
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8 – Input Devices
Understanding the Concept
• Keyboard
• Mouse
• Scanner
• Camera
• Microphone
• Permanent (Hard
Drive, USB Drive,
Optical Drives)
• CPU, Memory
Input
Process
Storage
Output
• Monitor
(CRT/LCD)
• Digital Projector
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Understanding Peripherals and
Input Devices
Fundamental Concepts
220‐701‐1.8:
Install and configure peripherals and input devices
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8 – Computer Mouse
Pointing Device
 Input device
 Pointing device
Com
(Serial)
Infrared (IR)
PS/2
 Common interface ports:
 Com (Serial Port)
 PS/2 (Mini-DIN, IBM’s PS/2 computer)
 USB
 Wireless (Bluetooth, Infrared)
 Types:
 Ball (Mechanical)
 Optical or Laser tracking
USB
Bluetooth
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8 – Computer Mouse
History
Computer mice built
between 1986 and 2007
Around 1981 Xerox included
mice with its Xerox Star, based on
the mouse used in the 1970s on the
Alto computer at Xerox PARC. Sun
Microsystems, Symbolics, Lisp
Machines Inc., and Tektronix also
shipped workstations with mice,
starting in about 1981. Later, inspired
by the Star, Apple Computer released
the Apple Lisa, which also used a
mouse. However, none of these
products achieved large-scale
success. Only with the release of the
Apple Macintosh in 1984 did the
mouse see widespread use.
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8 – Computer Mouse
Mechanical / Ball Mouse
Requires constant
cleaning due to dust and
lint inside the ball!
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8 – Computer Mouse
Mechanical / Ball Mouse Components
 Operating an
opto-mechanical
mouse.
1. Moving the mouse turns
2.
3.
4.
5.
the ball.
X and y rollers grip the
ball and transfer
movement
Optical encoding disks
include light holes.
Infrared leds shine
through the disks.
Sensors gather light
pulses to convert to x
and y vectors.
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8 – Computer Mouse
Optical / Laser Mouse
 Optical Mouse
 Uses one or more
Light-emitting
diodes (LEDs) to
detect movement.
 Uses coherent
(laser) light.
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8 – Tracking Mouse Movement
Optical Vs. Laser Mouse
Optical
Laser
 Uses an LED light in the
 Uses a laser to track
optical engine.
 A typical optical mouse
tracks between 400dpi and
800 dpi.
 Good for everyday
computing.
 May experience trouble
tracking on black or shiny
surfaces.
movement.
 Laser mice track more than
2,000dpi. (More sensitive!)
 Good for gaming and
artistic applications.
 Works on every surface
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8 – Other Pointing Devices
Trackball
Joystick
Gamepad
Drawing Tablet
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8 - Keyboard
PS/2
Mini-DIN
USB
Infrared (IR)
Bluetooth
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8 – Keyboard
Qwerty & Dvorak Layouts
Dvorak
Layout
Qwerty
Layout
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8 – Bar code reader
 Bar code readers are used in a
variety of point-of-sale retail,
library, industrial, medical, and
other environments to track
inventory.
 Technologies:
 Pen-type readers
 Laser scanners
 CCD readers
 Camera-based readers
 Omni-directional barcode
scanners
 Cell phone cameras
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8 – Biometric devices
Fingerprint readers, Iris recognition scanners
 Used to prevent
access by
unauthorized users.
 Common
technologies:
 Fingerprint
Recognition
 Face recognition
scanners
 Iris Recognition
Scanners
 Voice activation
system
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8 – Touch Screens
 Allows direct interaction
with applications without
the use of a pointing
device.
 Technologies:
 Resistive
 Surface acoustic wave
 Capacitive
 Surface capacitance
 Projected capacitance
 Mutual capacitance
 Self-capacitance
Multi-touch screen
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8 – Touch Screens
Resistive Touch Screen Technology
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8 – Touch Screens
Four-wire resistive
Four-wire resistive
technology
 Uses a glass panel coated with
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multiple layers that conduct and
resist electricity.
A flexible polyester cover sheet
fits over the glass panel and is
separated from the panel with
insulating separator dots.
The outer side of the cover has a
durable coating; the inner side
has a conductive coating.
When the cover is pressed, an
electrical signal is generated and
is sent through the interface to
the computer.
The lowest-cost touch screen
technology, this type of screen
is designed for public use.
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8 – Touch Screens
Five-wire Resistive
Five-wire resistive
technology
 A more sensitive and
more accurate version of
four-wire resistive
technology.
 Suitable for use by trained
personnel (offices, pointof-sale, and so on).
 More durable than 4-wire
resistive touch screens.
 More expensive
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8 – Touch Screens
Surface Acoustic wave
Surface Wave
 Uses horizontal and vertical
piezoelectric transducers to
create ultrasonic waves.
 Touching the screen overlay
disrupts the waves and the
coordinates of the touch
determine what signal is sent
to the computer.
 It’s the
most durable
surface able to compensate for
surface damage and dirt and is
suitable for self-service
applications such as banking
or information kiosks.
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8 – Touch Screens
Touch-on-tube
Touch-on-tube:
 Combines surface wave technology with
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direct touch contact to the CRT; no
overlay is necessary.
LCDs use an overlay with a simple air
gap between the overlay and the panel
surface.
Suitable for self-service applications.
Touch directly on tube—no touch screen
overlay
Preserves 100 percent of CRT
brightness, clarity, antireflection and
color properties
More durable and safer than even
bonded touch screen overlays
Same fast, accurate and stable
performance as surface wave
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8 – Touch Screens
Scanning infrared
Scanning infrared:
 A light grid created by
infrared (IR) signals is
used to sense
touches. Works with
plasma as well as
other types of
displays.
Microsoft Surface
Computer!
(5/2007  )
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8 – KVM Switch
Keyboard, Video, Mouse
 Hardware device that allows a user to
control multiple computers from a
single keyboard, video monitor and
mouse.
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USB Interfaces
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Firewire Interfaces
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eSATA
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