Transcript
Team Impact Intelligent Helmet Impact System Critical Design Review February 28th, 2008 Amanda Brodbeck Wei-Chu Liao Wei-Shen Liao Chris Mintle
Wei-Chu Liao aka Tom Chief Technical Officer
Project Statement Design and prototype an intelligent helmet that wirelessly transmits real time sensor data for collection and processing by a base station.
System Diagram Analog
SPI
LabVIEW GUI
SPI
Design Revisions Modification compare to previous design: • Temporary accelerometer change • 30 m indoor wireless transmission range
Hardware Flow Diagram Hardware ADXL321 Power
3 Analog Outputs
8MHz Oscillator
3.3V 5V USB
8 LEDs
MSP430F169 SPI
UART
A/D
RESET
Temperature
GPIO
JTAG
6 Headers
nRF24L01 SPI
USB 16MHz Oscillator
Outputs
CP2103 Chip Mini-USB Connector
PCB Antenna
Schematic
USB to UART • Single chip USB to UART Bridge (CP2103) • UART emulator • Drivers provided • Mini-USB connector
USB Schematic
Oscillators • • • •
SMD Very small profile 8 MHz for MSP430 16 MHz for nRF
Oscillator Schematic
Chris Mintle Chief Engineering Officer
Accelerometers • ADXL321 – Operating voltage 3.3V – Quiescent supply current of 0.49 mA – Dual axis – Medium impact (+/- 18g)
• Voltage divider is going to be needed later on
Accelerometer Schematic
uController • TI MSP430F169 – – – – – – – –
Requires 3.3V 600uA Max current draw in active mode Multi power mode capability 8MHz external crystal oscillator Port 1 debugging LEDs Port 3 UART for LabVIEW interface Port 5 SPI/transceiver communication Port 6 A/D from accelerometer
uC Schematic
Transceiver • Nordic nRF24L01 – – – – –
Requires 3.3V 11.3mA TX /12.3mA RX 2Mbit/s data rate 4 wire SPI interface 2.4 GHz transceiver
• Surface antenna – Etched on to board – Range to be tested
Transceiver Schematic
Timing Diagram
Timing Diagram (cont.) MOSI MISO CLK CSN CE
Power System • Voltage regulator (LM1117) – 5V and 3.3V available on board
• Goal is to have base station powered through USB – USB can supply up 100mA
• Helmet will be powered by battery. TBD
Power System Schematic
PCB
Amanda Brodbeck Chief Strategy Officer
General Software Diagram Software MSP430F169 PC Configuration LabVIEW SPI
Sampling
UART
Mini-USB Driver
MSP Configuration • • • • • • •
Ports Timing Power Modes Sampling DMA Master/Slave Interrupts
SPI • Interface to transceiver – Configure transceiver – Data handling – Interrupts
Sampling • A/D timing/sampling • DMA Handler • Multiple inputs
UART • Transmit data to computer for processing and display – TX/RX – Baud rate
Computer Software • LabVIEW – Processing data • Convert signal into meaningful data
– Displaying data on GUI
• Mini USB drivers
Wei-Shen Liao aka Ben Chief Financial Officer
Division of Labor Member Amanda Brodbeck
Tasks and Responsibilities LabVIEW GUI and UART.
Wei-Chu Liao
SPI, Transceiver, DMA, and USB interface
Wei-Shen Liao
Sampling, data processing, finances, and sensor control.
Chris Mintle Everyone
Schematic, PCB layout, SPI, DMA and USB interface Debug, Integration of software, Documentation
RACI Chart Amanda
Ben
Chris
Tom
Schematic & PCB
I
A
R
C
SPI & Transceiver
I
C
A
R
LabVIEW Interface
R
C
C
A
Sensors
I
R
C
A
Doc., Debug & Software Integration
R
R
R
R
R-Responsible C-Consult A-Accountable I-Inform
Schedule
Milestone I • • • •
Basic RF link Sensors communicate with microcontroller USB communication with computer Revision 1 of PCB completed and integrated • Multi-port sampling
Milestone II • Basic GUI • RF data transfer • Flex PCB schematics and layout ready for fabrication • Beginning documentation
Expo • Working prototype – Transmit sensor data between base station and helmet – Process and display data on LabVIEW GUI
• Documentation completed – User’s manual – Technical reference manual
Purchases:
Budget
Part nRF24L01(Dev. Board) MSP340F169 (Dev. Board) MSP340F169 Power supply nRF24L01 chip Acclerometer ADXL321 (Dev. Board) RS232 chip LM1117(voltage regulator chip) Oscillator 16MHz Total Purchases Expected Purchases for Milestone I: PCB Rev. 1 1st Order of passive components Mini-USB port CP2103 Chip ADXL321 Chip Mini-USB cable Total Expected Purchases for Milestone I Total Expenses Fundings: UROP EEF Total Avalible Funds: Remaining Funds Experience
Quanity Price 2 $19.95 1 $40.95 1 $3.00 5 $1.60 2 $5.91 2 $0.00 5 $0.00 5 $0.00
Total $39.90 $40.95 $3.00 $8.00 $11.82 $0.00 $0.00 $0.00 $103.67
1 $104.08 1 $60.00 5 $2.00 5 $2.00 6 $9.00 2 $5.95
$104.08 $60.00 $10.00 $10.00 $54.00 $11.90 $249.98 $353.65
$1,000 $832.00 $1,832 $1,478 Priceless
Questions?
