critical design review
DESCRIPTION
Critical Design Review. Project Overview. Two-way wireless communication between two separate motorcyclists. Low-power, low-profile design for easy installation/integration inside helmet. Adjustable volume, microphone gain, and channel selection. Restricted access to broadcasted audio. - PowerPoint PPT PresentationTRANSCRIPT
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Team members
Derek Lindberg
Sean McDevitt
Nick Ciocco
Eric Hoffman
Chris Browne
Wireless Nothing
Critical Design Review
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
• Two-way wireless communication between two separate motorcyclists.
• Low-power, low-profile design for easy installation/integration inside helmet.
• Adjustable volume, microphone gain, and channel selection.
• Restricted access to broadcasted audio.
Project Overview
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
High Level Concept
Short range RF
Long range RF
Long range RF
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Initial Set-backs – Wireless Transceiver
• nRF24Z1 – Only a point to point streaming device. • Not capable of handling TDD (time division
duplexing) or FDD (frequency division duplexing).
• nRF24L01 – Great device, but not yet in full production• Possible future use if breakout boards available
• nRF2401a – Current selection• Fastest data-rate for a “true” transceiver• Requires additional packet handling
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Initial Set-backs - Codec
• TI TLV320AIC28 • I2C control format• QFN package
• TI TLV320AIC33• Not available (just released)• QFN package
• Xemics XE3006• Audio format is standard serial (not I2S)• Not available in quantities under 62
• TI TLV320AIC23B• Available with all needed features• SOP package
1
2 3
4
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
DAC CodecADC Codec
MicrocontrollerMicrophone Headphones
Transceiver
System Block Diagram - Headset
I2S I2SSPI
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Block Diagram – Basestation
Microcontroller
Basestation to other
motorcyclisttransceiver
SPI Bus
Basestationto helmet
transceiver
• Serves as a booster for the helmet’s voice communications
• Handles channel allocation for slave headset
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Transceiver(s)
Microcontroller
• 48kB Flash, 1024B RAM• Extremely-low power
• 330uA active• 1.1uA standby mode
• Dual 12bit DACs• SPI interface in hardware• 48 IO pins
• RS232 Interface via MAX3222 transceiver
• HANDLING SPI/I2S——SPI——
Audio Codec
Microcontroller – MSP430F1611
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Timing Diagram I2S/SPI
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Main System (Base Station) Schematic
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Transceiver
• 2.4 GHz operating frequency• Low cost• Low power• 1Mbit/s ShockBurst Data Rate
• Low on-air time• SPI Communication• Dual-channel receiver (2Mbit/s)• Simple PCB antenna
——SPI——
Microcontroller
Receiving Transceiver
Transceiver – nRF2401a
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Microphone
Microcontroller
Headphones
Audio Codec
• Convert between analog and I2S• Low power/Low cost• High quality 16 bit sound• DAC and ADC in single chip for simplicity• Integrated gain control, volume control and
speaker drivers if possible• SPI control from Microcontroller
——I2S——
——Analog——
Audio Codec – TLV320AIC23B
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Current Project Plan – Divide and Conquer
• Printed circuit board tasks• Assemble• Test and debug• Begin second PCB revision
• Dev. board tasks• Establish communication between transceivers
• Experiment with data rate limitations using• Test maximum range and acceptable error rates.
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
MSP430F1611 Dev. Board with nRF2401a
• Prototype Base Station
• Provides test bed for extended functionality
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Printed Circuit Board Rev. 1
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Risks
• Difficulty making SPI communicate with I2S• High speed data rate and clock rate
• Unknown transmitter packet error rate at 1Mbps
• Difficulty with QFN package type (reflow)
• Wireless protocol complexity may be underestimated
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Backup Plan
Use MSP430F1611 internal ADC/DAC SPI communication with I2S is removed
Use lower data rate for transceiver Voice still possible and known implementation at
this data rate exist Out-source transceiver assembly or use breakout
boards from SparkFun
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Division of Labor
Group ResponsibilitiesDocumentation, system development, integration, system testing
Team Members Responsibility
Derek Lindberg Hardware layout and assembly, firmware programming
Sean McDevitt Antenna and Transceiver design
Nick Ciocco Transceiver design and PCB layout overview
Eric Hoffman Hardware layout and assembly, firmware programming
Chris Browne Assembly firmware programming, hardware integration
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Project Timeline
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Milestone 1 – March 23rd
• Printed circuit board assembled, tested, and debugged
• Microcontroller communicating with all peripherals
• Simple high-speed data transmission between two transceivers on development board
• Determine if addition of portable audio is feasible
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Milestone 2 – April 20th
• Preliminary voice communication up and running• Microphone in and headphone out
• Base station to headset acquisition
• Preliminary protocol functionality
• Preliminary portable audio capability, pending Milestone 1
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Budget/Final Parts List
Parts (per board) CostActive Components $60.00
Misc. Parts (all passive components) $5.00
Misc. Connectors $5.00
Total $70.00
Total (est. qty. 100) $30.00
Budget Breakdown Qty CostBase Stations 2 boards $140.00
Headset 8 boards $560.00
PCB 2 revs $300.00
Total -- $1,000.00
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
Questions ?
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
State Diagram – Headset
InitBase Station
Search Idle
Rx
Tx
Always
Pack
et T
x
Base Station Found
Wait Wait
Packet Decoded
Packet Received
Wak
e-O
n-V
oice
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Critical Design Review Handmade by Robots
ECEN 4610 Spring 2006Hands-Free Low-Profile Wireless Radio
State Diagram – Base Station
InitHeadsetSearch Idle
Local Audio
RemoteTx/Rx
Voice T
imeoutV
oice
Det
ecte
d
Always
Voi
ce T
imeo
ut w
/o
Aud
io
Headset Found
Wait Wait
No A
udio PresentA
udio Device
Present
Aud
io D
evic
e Pr
esen
t
Headset Lost