Mobile Fidelity
Souhaibe Barkat
Tenzin Dhongyal
Michael Duckwitz
Matthew Syme
Patrick Wagner
Critical Design Review
Spring 2007
March 1, 2007
1
Description
What is it?
Possible Additions

Analog input
– Microphone Jack
– Stereo Jack
– MP3 Encoding

Data transmission
 Multiple channels
 Rechargeable batteries for receivers
Microprocessor
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)
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)
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”
Transceiver Timing

Enhanced ShockBurst w/
automatic acknowledgment

Packet Size 32 bytes

Time for Transmission is
~436 µs

Maximum Data Rate w/ ESB
~ 642 kbps
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
Receiver Diagram
Non
Volatile
Memory
Tx/Rx
I
SP
Pa
ra
lle
l
“2.4 GHz”
SPI
MCU
IIS
DAC.
Analog
BlueTooth
Tx
AMP
LCD
Parallel
BlueTooth
Rx
Speakers
Decoder
PC Interface
DAC
AMP
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
Base Station Sequence Diagram
Base Station Operator
User Interface
Device controller
SD card
Analog Audio
1. Broadcast Song
2. Transfer Request
3. Get Song list
4. Return Song list
5. Get voice
6. Return sampled voice
7. Store in Memory
8. Send Song list/Msg
9. Display Song list/ Msg
10. Select song
11. Transfer Request
12. Broadcast Selected Song
13. Send Successful Msg
14. Send Status Msg
15. Display status Msg
a. Input Text
b. Transfer Text
c. Send Text
d. Send Successful Msg
e. Send Status Msg
f. Display status
Transceiver Applicatioin
Receiver Sequence Diagram
Receiver Operator
User Interface
Device controller
Transceiver Application
1.Play Song
2. Transfer Request
3. Get Song Channels
4. Return Song Channels
5. Store in Memory
6. Send Song list
7. Display Song list
8. Select Song
9. Play Selected Song
10. Codec Selected Song
11. Played Successful Msg
12. Send Status Msg
13. Display status Msg
a .Voice/Text Available Msg
b. Get Voice/Text
c. Store Voice/Text in Memory
d. Send Text
e. Display Text
f. Play voice
g. Voice Play Successful Msg
Analog Audio
Software
Architecture
Diagram
<<interface>>
UserInputHandler
userChoice
User Interface
Layer
<<controller>>
SelectionHandler
selects
displays
Returns
invokes
Domain Layer
<<controller >>
Base Station
Application
saves
<<controller >>
Audio Codec
Application
<<controller >>
SD Card Application
<<controller >>
Touch screen
Application
Base Station
controller
<<controller >>
Transceiver
Application
has
depends
<<entity>>
Song/Voice/Text
has
has
<<controller >>
Receiver
Application
has
<<controller >>
LCD
Application
has
Receiver
controller
<<controller >>
Audio Codec
Application
has
<<controller >>
Transceiver
Application
saves
<<entity>>
Song/Voice/Text
has
Utility Layer
<<interface>>
Song/Voice/data
StorageManager
<<interface>>
DOS I/0
FileManager
<<interface>>
Codec Driver
<<interface>>
LCD Driver
<<interface>>
Transceiver
Driver
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
Schedule
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
Bill of Materials
KEY HARDWARE COMPONENTS
Part number Manufacturer
Part Description
64-megabit 2.7-volt Only Dual-interface
AT45DB642
Atmel
DataFlash® (FREE)
DOSonCHIP-SD Sparkfun.com SD Card with DosOnChip Interface
RF-MiRF-v2
Sparkfun.com 2.4 GHz RF Transceiver
SAM7-P256
Olimex
Atmel AT91SAM7S256 Development Board
AccutekMicro Surface mount adapter (QFP-80 to DIP)
AccutekMicro Surface mount adapter (TSOP-40 to DIP)
ANT-24G-RP
Sparkfun.com 2.4 GHz RF Duck Antenna
8051 Microcontroller with MP3 Decoder and
AT89C51SND1
Atmel
Human Interface (FREE)
Miscellaneous components (resistors, capacitors, connectors, etc.)
Custom PCB Designs (4 layer, 5"x6")
Qty Unit Price Amount
4
$0.00
$0.00
1
4
1
4
8
4
$39.95
$29.95
$69.95
$12.00
$8.00
$6.95
$39.95
$119.80
$69.95
$48.00
$64.00
$27.80
6
$0.00
$0.00
1
6
$70.00
$66.00
$70.00
$396.00
TOTAL COST: $835.50
Questions?