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Programa de Computación y Tecnología. 8. Chapter 8: Module 1: Peripheral & Input Devices. 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
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8 Chapter 8: Module 1:Peripheral & Input Devices
8 – Peripheral and Input DevicesTopics 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
Understanding Peripherals and Input DevicesFundamental Concepts 220‐701‐1.8: Install and configure peripherals and input devices .
8 – Computer MousePointing Device • Input device • Pointing device • 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 Com (Serial) Infrared (IR) PS/2 USB Bluetooth
8 – Computer MouseHistory 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.
8 – Computer MouseMechanical / Ball Mouse Requires constant cleaning due to dust and lint inside the ball!
8 – Computer MouseMechanical / Ball Mouse Components • Operating an opto-mechanicalmouse. • Moving the mouse turns 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.
8 – Computer MouseOptical / Laser Mouse • Optical Mouse • Uses one or more Light-emitting diodes (LEDs) to detect movement. • Uses coherent (laser) light.
8 – Tracking Mouse MovementOptical Vs. Laser Mouse Optical Laser Uses a laser to track movement. Laser mice track more than 2,000dpi. (More sensitive!) Good for gaming and artistic applications. Works on every surface • Uses an LED light in the 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.
8 – Other Pointing Devices Trackball Joystick Gamepad Drawing Tablet
8 - Keyboard PS/2Mini-DIN USB Infrared (IR) Bluetooth
8 – KeyboardQwerty & Dvorak Layouts Dvorak Layout Qwerty Layout
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
8 – Biometric devicesFingerprint readers, Iris recognition scanners • Used to prevent access by unauthorized users. • Common technologies: • Fingerprint Recognition • Face recognition scanners • Iris Recognition Scanners • Voice activation system
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
8 – Touch ScreensFour-wire resistive Four-wire resistive technology • Uses a glass panel coated with 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.
8 – Touch ScreensFive-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, point-of-sale, and so on). • More durable than 4-wire resistive touch screens. • More expensive
8 – Touch ScreensSurface 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.
8 – Touch ScreensTouch-on-tube Touch-on-tube: • Combines surface wave technology with 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
8 – Touch ScreensScanning 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 )
8 – KVM SwitchKeyboard, Video, Mouse • Hardware device that allows a user to control multiple computers from a single keyboard, video monitor and mouse.
