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Team µBuoy

Team µBuoy. Bruce Chen. Spencer Krist. Phong Nguyen. Eric Stevens. Louis Tuey. Project Recap. Floatable Sonde , deployed via UAV Measures water temperatures at 3 depths below ocean surface Help scientists better understand arctic sea ice melt. Eric Stevens.

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Team µBuoy

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  1. Team µBuoy Bruce Chen Spencer Krist Phong Nguyen Eric Stevens Louis Tuey

  2. Project Recap • Floatable Sonde, deployed via UAV • Measures water temperatures at 3 depths below ocean surface • Help scientists better understand arctic sea ice melt Eric Stevens

  3. Level 0 Functional Decomp. • Inputs • UAV Commands • Input (Temperature/ GPS) Data • Outputs • Packaged Temperature and Position Data UAV Commands 0.0 Data Out Micro Buoy Data In Block diagram O- Level 0 Block Diagram Eric Stevens

  4. PCB Electronics (µCU, RF, GPS, Memory, PWR, Thermistor Support) Level 1 Functional Decomp. • PCB Electronics • Inputs: UAV Handshaking Commands, Raw Temp Data • Outputs: Packaged Temp. and Location Data • Power Supply • Output: Regulated voltages to PCB board and Thermistors • Thermistor String • Inputs: Power for current supply, microcontroller request for data • Output: Raw temperature Data to ADC 1.0 UAV Commands Data Out GPS Data In Power Supply (Battery, 3.7V) Thermistor String Eric Stevens Block diagram 1- Level 1 Block Diagram

  5. Level 2 – Functional Decomposition Eric Stevens http://blog.timesunion.com/opinion/clean-up-space-with-tungsten-sandblaster/12060/broadcasting-satellite/

  6. Radio • EzRadioPRO • Si4430 ISM Transceiver • Frequency Range: 240-960 MHz • Output power range: +20 dBm • Data Rate: 256 kbps • Low battery detector • Temperature range: -40 to +85 ℃ • Sensitivity: -121 dBm Phong Nguyen http://www.silabs.com/pages/DownloadDoc.aspx?FILEURL=Support%20Documents/TechnicalDocs/Si4330.pdf&src=DocumentationWebPart

  7. Block Diagram Phong Nguyen

  8. Operating Modes Transmit w Transmit Idle Receive Phong Nguyen

  9. Communication protocols Phong Nguyen

  10. Microcontroller SI-1000 Bruce Chen

  11. Power Modes Bruce Chen

  12. Module: Start Turn on all the component Check if GPS and Radio are on Turn on Turn on GPS, Radio No Return Error Yes Enable all Interrupt: smaRTClock, Port Match Calibrate Timestamp Time Setup the SmarRTClock: Time Low Priority Setup the Port Match: P0 High Priority C=0; Sleep(GPS); Sleep(Radio); Sleep(MC); Bruce Chen

  13. Module: Start • Set up the Interrupt • Address 0xA8, 0xE6, 0xE7 • Priority -> 0xF6, 0xF7 • Sleep • Microcontroller 1 into Address,0xF6 bit 7 • GPS low into pin#4 • Radio “07h” into register 0h Bruce Chen

  14. SmarRTClock Handler --Low Priority • Measure temperature N times per hour • Get the position every hour • Store the data with Timestamps If an hour pass(C>60/N) Store the Temperature and timestamps C++; Sleep(MC) No Wake(MC) Yes Sleep(GPS) Wake(GPS) Store the Temperature and timestamps Calibrate MC the Time; C=0; Store GPS data and timestamps Wait(35) Bruce Chen

  15. Port Match Handler --High Priority • Send the signal to UAV with ID and position • Send the signal to UAV with the stored data Wake(MC) Wake(Radio) Send data base on command If(ID== Reuested_ ID) Command Decoding Sleep(Radio) Sleep(MC) Yes No Send ID and Location Sleep(GPS) Wake(GPS) Bruce Chen

  16. Thermistor Bridges -Design Criteria Temperature Range: -10°C25°C Accurate to at least 0.1°C Using 3.3V from a GPIO Pin Using a 10 KΩ resistor and a 10kΩ (@25°C) thermistor Murata PN: NCP18XV103J03RB Or Vishay PN: NTCLE100E3103JB0 Louis Tuey

  17. With given components ΔV = 1.142 Volts over temp range Temperature Resolution: For 10 Bit ADC For 12 Bit ADC Louis Tuey

  18. Power Budget • With the smallest mass possible, power the buoy for a period of greater than 2 weeks Louis Tuey

  19. DC Voltage Rails • Microcontroller RF module 3.3 Volts up to 100mA • GPS 2.7 and 3.3 volts up to 50 mA Louis Tuey

  20. Texas Inst: TPS62240 Regulator Louis Tuey

  21. GPS • Model: • Fastrax IT03-S • Primary Objective: • Provide time and position • Interface: • CMOS- 2 port UART interface • GPS Handler • Fix Times: • Cold Start: 35 seconds • Warm Start:34 s • Hot Start: 4 s http://www.fastraxgps.com/products/gpsmodules/03series/it03s%28eol%29/ Spencer Krist

  22. GPS Data Handling • Positioning Data • $GPGGA, 084053.39,6016.3052,N,02458.3735,E,0,00,0.0,46.6,M,,*5D • Type – global positioning system fix data • Time – 08 Hours, 40 minutes, 53 Seconds and 39 hundredths of a second • Latitude- 60 degrees and 16.3052 minutes North • Longitude- 24 degrees and 58.3735 minutes East • Fix Indicator – 0=Fix not valid, 1=Fix valid • Number of Satellites- 0 • Horizontal Dilution- 0.0 • Altitude- 46.6 meters • Time Data • Similar string to positioning string • Allows for update of GPS modules real time clock, functions in sleep mode Spencer Krist

  23. GPS Exchange • Microcontroller requests GPS position and time data hourly • GPS receives data from satellites • 35 s max fix time (TTFF) • Microcontroller receives data strings from GPS module • Microcontroller parses and saves time and position data • Data is logged in flash memory Spencer Krist

  24. Division of Labor: Revisited Spencer Krist

  25. Equipment-Major Components • Have: • SI 1000 development kits • Fastrax IT03-S • Batteries – Polymer Lithium Ion- 850 mAh • On Order: • Additional Fastrax IT03-S • Need: • PCB • Memory • SI 1000 (Actual Chips) Spencer Krist

  26. Source of Funding Blank Check Spencer Krist

  27. Budget: Revisited Spencer Krist

  28. Schedule Spencer Krist

  29. Milestone Goals • Milestone 1 • 2 Dev Boards communicating • Thermistor circuit taking temp data • Milestone 2 • Thermistor string feeding temperature data to microcontroller through ADC • Data storage in flash memory • GPS data Spencer Krist

  30. Expo Day Goals • Floating buoy in water tank • Dev Board connected to PC acting as UAV • Buoy responds to Dev Board commands with temperature and position data • Data displayed on PC monitor PC Spencer Krist

  31. Questions?

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