Mobile Electronic Communications Device Audio Capability Disabler

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Mobile Electronic Communications Device Audio
Capability Disabler
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Group 25
Ilan Sklar Group Leader Neal Snyder David
Riley Seung Yoo Advisor Professor Hong Bin Li
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Abstract

• The purpose of this design project is to present
  a scaled down version of a mobile communications
  device and a transmitter that will disable
  audible ringers.
• We will also illustrate the re-engineering of
  existing technology to provide an improved
  design.
• This improved design will feature fewer
  transmitting locations in and around the quiet
  area and provide a cost effective alternative.

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State of the Art
Existing Technology

• Bluelinx developing similar technology utilizing
  Bluetooth wireless modules.
• Bluetooth weaknesses
• Expensive
• Allowable radiation limits range of coverage

Our Design

• Utilize lower frequency transmitters
• Inexpensive parts
• Easily available
• Memory and timer
• Longer Range

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Design Requirements
Electrical Engineering

• Construction of Transmitters and Receivers
• Main system parameter is the range of the
  Transmitter and Receivers
• Utilize pre-fabricated modules and adjust them
  to our desired outputs.
• Chipset includes encoder, decoder and antenna
• Transmitter and Receiver equipped with four
  channels

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System Design
Electrical Engineering

• Utilizing pre-fabricated kits that can be
  adjusted to the projects desired needs.
• Transmitter module designed to receive digital
  serial data from the encoder and transmit an RF
  signal at 418 MHz.
• The Serial data is received and sent to the
  decoder

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System Design
Electrical Engineering
Transmitter (courtesy Glolab Co.)

• Configured as encoder by connecting pin 7 to a
  voltage source.
• Pins 6, 10, 11, 12 and 13 are input pins with
  200 microampere pullup current sources. (terminal
  pins 0-4)
• Transmission initiated by pulling one of the
  inputs from LOW to Vss. (5V)
• Transmitter module receives digital serial data
  from the encoder and transmits at 418MHz.

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System Design
Electrical Engineering
Transmitter (courtesy Glolab Co.)
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System Design
Electrical Engineering
Receiver (courtesy Glolab Co.)

• Configured as decoder by connecting pin 7 to a
  voltage source.
• Serial data received by the RM1V module and
  feeds into input pin 13 on decoder.
• Addresses are selected by positions 1-4 of DIP
  switch SW5.
• These are compared with addresses received and
  if data is valid then it is sent to the decoder.
• Receiver outputs are connected to five NPN
  bipolar
• transistors that sink 400 milliamperes each.
• These transistors are controlled by position 5
  on the DIP switch, which can either be momentary
  or latched outputs.

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System Design
Electrical Engineering
Receiver (courtesy Glolab Co.)
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Emulator Board
M68HC705JICS In-Circuit Simulator -means of
developing and debugging target systems
incorporating the MC68HC705J1A MCU -development
environment that combines program assembly,
editing, and in-circuit simulation -communication
with host computer via serial ports -Ability to
program EPROM MC68HC705J1A MCU
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Input Simulation
disable
enable
ringer
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In-circuit Simulator
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Simulator in-depth

• CPU Window
• shows current values in accumulator, register,
  stack pointer, program counter, condition code
  register, and cycle counter.

• Code Window
• shows actual source code

• Variables Window
• shows current values for specified byte, word, or
  string variables

• Memory Window
• current value of memory locations

• Debug Window
• Error messages appear in the window.

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Design Requirements
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Design Requirements (part 1)
The computer engineering part will be concerned
with the following.

• The phone system will be simulated by a receiver
  communicating with a microprocessor.

• The microprocessor will function as the "brains"
  of the system and carryout requests sent by the
  receiver.

• The microprocessor function is to act as a
  switch between states. It will carry out two
  states, an enable state and a disable state.

• The microprocessor must take in the "ring"
  signal from the receiver and decide whether it
  can carry out the command determined by which
  state it is in.

• If the enable state is on, then when the "ring"
  signal is sent we will audibly hear the ringer.

• If the disable state is on then the ring command
  signal will not be carried out, therefore being
  inaudible.

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Design Requirements (part 2)

• Another design feature that will be implemented
  on the microprocessor is based on the fact that
  if the system leaves the range of the transceiver
  and does not return to the enable state (the
  state at which the system entered with) a timer
  will be placed on the disable state, to ensure
  the phone returns to its original "ring" state.
  This timer will be independently programmed by
  the location or venue in which the transceiver
  resides.

• In order to ensure the different states, there
  will be LED's attached to the microprocessor,
  demonstrating which state the system is currently
  in.

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System Design
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MC68HC705J1A chip
The MC68HC705J1A is a member of the low-cost,
high-performance M68HC05 Family of 8-bit
microcontroller units (MCUs). All MCUs in the
family use the popular M68HC05 central processor
unit (CPU) and are available with a variety of
subsystems, memory sizes and types, and package
types.
Specifications

• Memory-Mapped Input/Output (I/O) Registers
• 1240 Bytes of EPROM/OTPROM, Including Eight
  Bytes for User Vectors
• 64 Bytes of User RAM
• Peripheral Modules
• 15-Stage Multifunction Timer
• 14 Bidirectional Input/Output (I/O)

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Flowchart
Bit status is checked
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Chip Architecture
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Financial Budget
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Project Schedule
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Summary

• Utilizing the Transmitter and Receiver package
  from the Glolab Co. we will create an electronic
  device to simulate a person receiving a phone
  call in a quiet area.
• Integrating both hardware and software the
  simulation will provide a wireless example of our
  idea.
• This design will be implemented and tested
  successfully as mentioned in the full design
  report.