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Team Impact

Team Impact. Intelligent Helmet Impact System Critical Design Review February 28 th , 2008 Amanda Brodbeck Wei-Chu Liao Wei-Shen Liao Chris Mintle. Wei-Chu Liao aka Tom. Chief Technical Officer. Project Statement.

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Team Impact

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  1. Team Impact Intelligent Helmet Impact System Critical Design Review February 28th, 2008 Amanda Brodbeck Wei-Chu Liao Wei-Shen Liao Chris Mintle

  2. Wei-Chu Liao aka Tom Chief Technical Officer

  3. Project Statement Design and prototype an intelligent helmet that wirelessly transmits real time sensor data for collection and processing by a base station.

  4. System Diagram Analog SPI LabVIEW GUI SPI

  5. Design Revisions Modification compare to previous design: • Temporary accelerometer change • 30 m indoor wireless transmission range

  6. Hardware Flow Diagram

  7. Schematic

  8. USB to UART • Single chip USB to UART Bridge (CP2103) • UART emulator • Drivers provided • Mini-USB connector

  9. USB Schematic

  10. Oscillators • SMD • Very small profile • 8 MHz for MSP430 • 16 MHz for nRF

  11. Oscillator Schematic

  12. Chris Mintle Chief Engineering Officer

  13. 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

  14. Accelerometer Schematic

  15. 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

  16. uC Schematic

  17. 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

  18. Transceiver Schematic

  19. Timing Diagram

  20. Timing Diagram (cont.) MOSI MISO CLK CSN CE

  21. 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

  22. Power System Schematic

  23. PCB

  24. Amanda Brodbeck Chief Strategy Officer

  25. General Software Diagram

  26. MSP Configuration • Ports • Timing • Power Modes • Sampling • DMA • Master/Slave • Interrupts

  27. SPI • Interface to transceiver • Configure transceiver • Data handling • Interrupts

  28. Sampling • A/D timing/sampling • DMA Handler • Multiple inputs

  29. UART • Transmit data to computer for processing and display • TX/RX • Baud rate

  30. Computer Software • LabVIEW • Processing data • Convert signal into meaningful data • Displaying data on GUI • Mini USB drivers

  31. Wei-Shen Liao aka Ben Chief Financial Officer

  32. Division of Labor

  33. RACI Chart R-Responsible A-Accountable C-Consult I-Inform

  34. Schedule

  35. Milestone I • Basic RF link • Sensors communicate with microcontroller • USB communication with computer • Revision 1 of PCB completed and integrated • Multi-port sampling

  36. Milestone II • Basic GUI • RF data transfer • Flex PCB schematics and layout ready for fabrication • Beginning documentation

  37. 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

  38. Budget

  39. Questions?

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