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Wireless Telemetry System for Solar Vehicle

School of Electrical and Computer Engineering. Wireless Telemetry System for Solar Vehicle. Scott Cowan Elliot Hernandez Tung Le March 14, 2011. Project Overview. Source: http://www.ece.gatech.edu/academic/courses/ece4007/10fall/ECE4007L01/ws1/files/sjt_final_presentation.ppt.

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Wireless Telemetry System for Solar Vehicle

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  1. School of Electrical and Computer Engineering Wireless Telemetry System for Solar Vehicle Scott Cowan Elliot Hernandez Tung Le March 14, 2011

  2. Project Overview Source: http://www.ece.gatech.edu/academic/courses/ece4007/10fall/ECE4007L01/ws1/files/sjt_final_presentation.ppt

  3. Prior Work from Fall 2010 • GPS receiver • Wi-Fi link • Data storage • Data acquisition • Voltage • Current • Temperature • Speed

  4. Shortcomings of Fall 2010 Design • Current sensors • Low sensitivity • Unipolar sensing • Speed sensor • Fragile design • Interface board • Proto-board

  5. Transition Problems • Programming • Serial Peripheral Interface (SPI) bus not working • Hardware dismantled • All sensors lost • Parts list incomplete • Part numbers missing

  6. Spring 2011 Remedies • Current sensors • Lower range = higher sensitivity • Bipolar = bidirectional sensing • Speed sensor • Industrial sensor = robustness • Interface board • Printed circuit board (PCB) = permanence

  7. Additional Features • Take advantage of SPI bus • Enclose PCB and SBC for protection • Read data from other subsystems on the RS-485 network

  8. Current Status • Completed tasks • Preliminary schematic design • Component selection • Linux driver installation • Cross-compiler setup • Present tasks • Finalizing schematic and PCB designs • Soldering components • Coding program • Auto-sync • Transmit data

  9. Design Overview Solar Car Current Transmitter Data Storage Chase Car Speed USB USB SBC Temperature SPI DIO Laptop RS-485/RS-232 USB Voltage Battery Mgmt. Motor Ctrl. MPPT HMI GPS

  10. Current Measurement • Bi-polar Hall-effect sensor • Sensing range: ± 140 A • Maximum cable size: 1/2″ OD • 10 available inputs

  11. Speed Measurement • Industrial Hall-effect sensor • Senses magnet attached to wheel • Sends pulse to SBC • Computes Δt between pulses Wheel

  12. Temperature Measurement • Diode-connected transistor • Two available inputs for remote sensors • On-chip ADC • Accuracy of ±1 degree C

  13. Voltage Measurement • Simple voltage divider network • Total of six 0-5 Vdc inputs • Three remote signal conditioners for voltages up to 120 Vdc

  14. Interface Board • Custom PCB • Interconnection between Inputs/Outputs (I/O) and SBC • Signal buffering • Analog to Digital conversions

  15. Single Board Computer • TS-7250 • Heart of telemetry system • Linux operating system • C language programming

  16. Vehicle Location • GlobalSat BU-353 GPS receiver • NMEA 0183 protocol • Waterproof • Five foot USB cable

  17. Data from Other Subsystems • Other subsystems communicate on RS-485 network • Telemetry “listens” through RS-485 to RS-232 converter • Relevant data captured and stored • Requested data sent to HMI Battery Mgmt. Motor Ctrl. MPPT HMI

  18. Data Storage • 2GB USB flash drive • FAT16 file system • One record set per second • CSV file format

  19. Data Transmission to Chase Car • ASUS WL-167g Wi-Fi transmitter • IEEE 802.11g standard • Supported by SBC drivers • Range of up to 150 m

  20. Enclosure • Lightweight ABS plastic • Approximately 7 x 8 x 2.5 inches (W x L x H) • IP 54 rating

  21. General Challenges • Slow delivery of parts has delayed testing • Current sensors • QSOP to DIP adapters • Identification of major components has delayed SBC programming • TS-7250 SBC • 2 GB USB memory stick

  22. Interface Board Challenges • DesignSpark learning curve • Design and Library Creation tutorials helpful • Printed Circuit Board size limit • ECE machine limited to 7 x 8 inch PCBs • Component specification • Connector selection

  23. Programming Challenges • TS-7250 SBC learning curve • Tyler Mann has assisted • Linux compatible drivers • GPS, Wi-Fi, and memory devices • Serial Peripheral Interface (SPI) Bus • Needs to work before PCB design is finalized

  24. Future Testing • Speed sensor • Current sensors • Temperature sensors • Voltage signal conditioners • SPI bus • RS-485 to RS-232 converter • Communication to HMI

  25. Project Schedule

  26. Future Costs for Solar Jackets

  27. Questions?

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