Group 3 - Comparison

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Devices: General Desciption

The devices to be compared are an HP Inject printer and a Sony Walkman portable CD player. At the end of the following table, links can be found to pages describing each individual device in greater detail, including photos.

Comparison Table of Components

Printer versus CD Player Components
Component Category CD Player Printer Comparison Notes
Human Machine Interface (HMI)
  • CD function buttons: Play, stop, forward, back
  • Hold button: Prevents buttons player from registering button presses when not desired
  • LCD Screen: Displays the following information
  • Control buttons/panel: Power, paper, cancel
    • Press button one time once operation is performed
  • LCD lights: Shows printer is on and if there are problems
  • Computer: Job is sent to the printer from a computer program
  • Both devices use a simple set of buttons to interface with the user
  • Both devices have a visual display to interact with the user
  • The printer requires an additional interface with a computer, whereas the cd player does not
  • Optical sensor: Reads data, senses end of disk and position of laser on disk
  • Battery system: Checks to see the amount of battery power left
  • Optical encoder: Uses counting method to detect that paper is ready to print
  • Cartridge detector: Indicates if ink cartridges missing
  • Ink detector: Indicates if ink is low
  • Both devices use optical sensors to monitor their operation
  • The cd player requires batteries and therefore requires a sensor to warn the user if the power supply is running low
  • Disk spinning motor: Spins CD, must be able to decrease angular velocity as laser moves outward
  • Optical sensor motor: Moves optical sensor radially to follow tracks on disk, very precise
  • Flaps: Move to pick up and guide paper
  • Belt/motor system: Moves cartridge holder along rod
  • Rod/wheel system: Rotates to move and guide paper
  • Cartridge holder: Moves in and out of position depending on whether it is in use or not
  • Both devices require percisely controled movments in order to operate properly
    • The printer must know where the paper is at all times
    • The CD player must read the disc at a constant pace
Power Supply
  • Two AA batteries or AC->DC converter
  • Powers motors, LCD sceen, microprocessor
  • 100-240 Volt DC Motors (3)
  • Both devices have DC motors, and therefore require a AC to DC converter if plugged into an AC source
Power Conversion
  • Optical sensor gear system and motors
  • Electrical power conversion on circuit board
  • Gear transmission for the motor that rotates the Rod/wheel system and the Cartridge holder
  • Both devices use gears to transfer power from the motors
Motion Conversion
  • Rotation gear motion is converted to linear motion of optical sensor by turning a threaded rod that translates the sensor along itself
  • Rotary input from the motor is converted to linear output of the cartridge holder
  • Both devices convert the rotation of their motors into linear movement
  • The microprocessor on the circuit board
  • Decides how to adjust the optical sensor’s position to track the appropriate line on the CD
  • Takes input from user and applies appropriate programs – such as play, stop, forward, back, increase and decrease in volume, shuffle, repeat
  • Shuts off motors when end of CD is reached
  • Monitors battery power
  • Monitors inputs from humans
  • Microprocessor and accompanying circuitry
  • Multiple circuit boards
    • Communicate between computer and printer - Control panel/buttons, ink cartridges, optical encoder
    • Communicate between power and printer
  • Microprocessors control the mechatronc capabilities of both devices
  • Intellegence is required for the successful operation of both of these devices in order to interface with the user and control their motors
Links to Individual Pages

Group 3 - Sony Walkman

Group 3 - hpdeskjet 960c Printer