Mobile Fidelity

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Mobile Fidelity

• Souhaibe Barkat
• Tenzin Dhongyal
• Michael Duckwitz
• Matthew Syme
• Patrick Wagner

Critical Design Review Spring 2007
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Description

• What is it?

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Possible Additions

• Analog input
• Microphone Jack
• Stereo Jack
• MP3 Encoding
• Data transmission
• Multiple channels
• Rechargeable batteries for receivers

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Microprocessor
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SD Card / DOSonChip

• FAT-16 /FAT-32 Decoding/encoding
• High capacity SD Card
• Quick SPI interface (1.5Mbps)
• 5.3 sec/MB data transfer (average loading time
  per song 16 sec)

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External Memory

• Atmel AT45DB642 DataFlash memory
• Parallel connection
• High capacity 8MB!!!
• Full song storage
• SD card removal during song play
• Extremely fast (up to 20Mbps)

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Transceivers

• Nordic nrf24L01
• 1.9 to 3.6 V supply
• Integrated as 8-pin IC
• Clock Speed up to 10 MHz
• SPI Compatible
• 2.4 GHz Wireless Band
• 4 dBm Transmit Power
• 5 Distinct Channels

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Transceiver Timing

• Enhanced ShockBurst w/ automatic acknowledgment
• Packet Size 32 bytes
• Time for Transmission is 436 µs
• Maximum Data Rate w/ ESB 642 kbps

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Receiver Synchronization

• 2 Way Communication
• Receiver Circular Buffer
• 2 States for Receivers
• Sync New Receiver
• Sync state Currently Synchronized to Song
  Location
• New Receiver state New and Dropped Packet
  Resynchronization

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Receiver Diagram
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Decoder
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PC Interface
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DAC
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AMP
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Touch Screen

• Allen/Bradley PanelView 600
• - 6.0" diagonal color display 320x240 pixel
  resolution
• - 128 x 9 Touch Cells,RS 232 protocol
• - Panel Builder 32 application development
  software
• - Understand PLC and graphical ladder logic
  programming
• Crystal Fontz touchscreen (CFAX12864CP1)
• - 128x64 graphic LCD with Samsung KS0713
  controller
• - EL backlight and 4-wire analog touch screen
• - 65 x 135 DD RAM addressable array
• - 8 bit parallel or serial interface
• Labview
• - visual programming with vi modules and RS 232
  protocol

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Base Station Sequence Diagram
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Receiver Sequence Diagram
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Software Architecture Diagram
User Interface Layer
selects
displays
invokes
Returns
Domain Layer
saves
Base Station controller
has
depends
Receiver controller
has
has
has
saves
has
has
has
Utility Layer
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Deliverables

• Milestone 1, March 22
• Transceivers passing data
• SD Card communication
• Milestone 2, April 19
• Full-song play
• Basic touch screen user interface
• Receiver PCB prototype

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Schedule
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Division of Labor
Team member Responsibility
Souhaibe Barkat MP3 Decoder, PCB Design, Documentation
Tenzin Dhongyal User Interface, Software Lead, Documentation
Michael Duckwitz PCB Design, Transceivers, Documentation
Matthew Syme SD Card Interface, PCB Design, External Memory, Documentation
Patrick Wagner Transceivers, User Interface, Documentation
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Bill of Materials
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• Questions?