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Bluetooth-enabled Thermal Sensor

Bluetooth-enabled Thermal Sensor. 4 December, 2002 Bonnie Benjamin Kavitha Sagi Shelly Wisted ECE 345 - Schreiber. Presentation Overview. Project Description Challenges Lessons Learned Questions Acknowledgements. High-level Overview. Circuit. Bluetooth. LabVIEW. Circuit Detail.

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Bluetooth-enabled Thermal Sensor

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  1. Bluetooth-enabled Thermal Sensor 4 December, 2002 Bonnie Benjamin Kavitha Sagi Shelly Wisted ECE 345 - Schreiber

  2. Presentation Overview • Project Description • Challenges • Lessons Learned • Questions • Acknowledgements

  3. High-levelOverview Circuit Bluetooth LabVIEW

  4. Circuit Detail Temp Sensor Adder Amplifier Rectifier PIC16F877 Max 232

  5. Temp sensor • LM34CH • Sensor range: • -50° to 350°F • Range for project: • 68° to 105°F • 118 mV per °F • 8.44°F per V

  6. Sensor Calibration

  7. Sensor Calibrationwith trendline

  8. Adder • Input range: • -1 to 6 V • Shifted range: • -1.72 to 5.28 V • Purpose: • 0V = 68°F • 0.356V = 105°F

  9. Amplifier • Gain: 12.5 V/V • Amplified range: • -5 to 5 V • Saturates at 5V (ideally) • Purpose: • 0V = 68°F • 4.3V = 105°F • 0-5V range for PIC

  10. Rectifier Rectifier Inverter • Gain: 1 V/V • New range: • 0 to 5 V (ideally) • Purpose: • Acts like clipper (0 – 5 V)

  11. Circuit Performance Calculated Saturation point at 103° Measured

  12. PIC16F877 • RS232 Standard • iSPA • Data transmission • A/D • 10 bit conversion • USART • Start and Stop Bits • Baud rate generator = Fosc/(64(x+1))

  13. PIC Programming • Basic Programming • L.E.T PicBasic Pro • PICALL • Testing • A/D • USART

  14. MAX 232 • RS 232 Standard • Converts voltage • Transmits bits to iSPA • Data rate of 9600

  15. High-levelOverview Bluetooth LabVIEW Circuit

  16. Bluetooth Detail Impulsesoft Serial Port Adapter (iSPA) (from circuit) Belkin card (PCMCIA card) (on laptop)

  17. iSPA • Acts as a COM port • Configure • Server • Bits/sec, stop bits, flow control • Testing Functionality • Other Bluetooth Devices • Data Transmission

  18. PCMCIA Card • Client • Configure as COM port • Same baud rate and stop bits as iSPA • Data Acquisition

  19. High-levelOverview LabVIEW Circuit Bluetooth

  20. LabVIEW detail COM port Collect 8 bits Convert to voltage Convert to temperature

  21. LabVIEW: D/A Conversion

  22. LabVIEW: Final Program

  23. LabVIEW: Final Program

  24. Challenges • Little knowledge of concepts • Bluetooth • PIC programming • RS232 standard • Data acquisition from COM port • Wide temperature range • Ordering from International

  25. Lessons Learned • General • Bluetooth Standard • LabVIEW • Department Resources • Relating with customer support • Electrical • Datasheet terminology • Analog circuits • Lab equipment

  26. Questions

  27. Acknowledgements • Shaun Anders • Dr. Jennifer Bernhard • Christian Hahn • Paul Leisher • Dan Mast • Henry Schaper • Russ Schreiber • Dr. Gary Swenson • Jim Wehmer • Belkin • Impulsesoft • Microchip • National Instruments

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