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Wireless TPS Sensors

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Wireless TPS Sensors. Detailed Design Review February 12, 2008. Jesse Pentzer John Sochacki Brandy Holmes Chris Johnson Lucas Wells. Outline. Introduction PCB Sensor Node Software Receiver Node Software X-Jet Packaging VAST Packaging Timeline Budget. Amplifier. CJCs. LDO Regulator.

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Wireless TPS Sensors

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  1. Wireless TPS Sensors Detailed Design ReviewFebruary 12, 2008 Jesse PentzerJohn SochackiBrandy HolmesChris JohnsonLucas Wells

  2. Outline • Introduction • PCB • Sensor Node Software • Receiver Node Software • X-Jet Packaging • VAST Packaging • Timeline • Budget

  3. Amplifier CJCs LDO Regulator LDO Regulator LDO Regulator Pressure Sensor XBee PIC

  4. CJC CJC CJC LDO LDO LDO Amp RTD XBee Pressure

  5. Newest Revision Air-wires will be resolved through testing

  6. Final Concept Final Concept

  7. Final Concept Final Concept

  8. Software Flow Sensor Node • Poll of Sensors • I2C (pressure sensor) • A/D (RTD temp. sensor) • SPI (3 thermocouple temp. sensor) • Communication • USART (XBEE transceiver) • Data Structure Union with Array • Redundant Send

  9. Error Reduction • Program Lockups • Conditional Locked Loops • Watchdog Timer (WDT) • Data Reliability • Redundant Data • Use PIC EEPROM to store old sensor data • Data Comparison

  10. Error Reduction Cont’d • Code Protection • Power Problems • Brown-Out Reset (BOR)

  11. Rabbit RCM 4510W

  12. Receiver Node Data Flow

  13. LabVIEW Interface • Communications Parameters • Thermal Coupler graph • Pressure graph • RTD graph • Data Storage in File

  14. LabVIEW Logic Diagram Communication Parameters (user input) Configure Serial Port Set Termination Character Set XON and XOFF Characters Write data to serial port Set I/O Buffer Size Close Session Read Data for buffer Write Data to File Display Data on Graph

  15. X-Jet Preparation Using an aluminum sheet metal box to house electronics. Discs of TPS material allow thermocouples to measure temperature along a centerline through block. Static tube allows pressure measurement inside X-Jet 16

  16. X-Jet Preparation - Progress

  17. Thermal X-Jet Model • Assumptions: • TPS properties constant • 1-D heat transfer along centerline of TPS Heat Flux Node: Interior Node: Convection Node:

  18. Thermal X-Jet Model – Current Results Heat Flux at q=10000 W/m^2

  19. VAST Flight • Four sensor nodes and the receiver node will be flown. • Pressurized capsule allows the balloon’s internal pressure to be measured. • Capsules made of extruded polystyrene insulation foam. 20

  20. VAST Flight: Progress

  21. Timeline 22

  22. Beginning Budget $10,943 Shop and UI Fee $1,360 Travel Allocation $7,343 Beginning Spending Budget $2,240 Current Spending Left $957 Budget Status 23

  23. Closing • PCB and Programming are our biggest challenges at this time • We are within budget • Still on track to meet all goals

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