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SeventhSense

SeventhSense. Critical Design Review Capstone Lab 2009. Steven Sorenson Anand Suchak John Strueber Greg Smith Kristen Aragon. Agenda. Overview Core Functionality System Breakdown Risks Budget Division of Labor Schedule Questions. Kristen. Overview.

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SeventhSense

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  1. SeventhSense Critical Design Review Capstone Lab 2009 Steven Sorenson Anand Suchak John Strueber Greg Smith Kristen Aragon

  2. Agenda • Overview • Core Functionality • System Breakdown • Risks • Budget • Division of Labor • Schedule • Questions Kristen

  3. Overview • We will be creating an interface for a mp3 player to allow for button-less control. • We will also be creating a perfomance data collector that will keep track of position, heart rate, g-forces and accidents. • This would be useful in situations where you cannot easily access the mp3 player and it will also provide the user with feedback from the day. Kristen

  4. Core Functionality • Song Control • Previous/Next track • Play/Pause • Volume Up/Down • Wireless Control • Monitoring • GPS • Heart Rate Monitor • Accelerometers • Pressure Sensors Kristen

  5. System Breakdown John

  6. Central Device Microcontroller • Using two ATTiny µcs • One operating as Master of I2C, other as Slave • On-chip UARTs dedicated to Bluetooth and GPS modules • Need one more UART for SD card memory • Using Phillips SC16IS740 bridge connected to I2C bus • EFI and ECG sensors will interface over ADC John

  7. BUD (Boot Unit Device) Steven

  8. BUD Microcontroller Steven

  9. BUD Free Diagram Steven

  10. GPS • SiRF Star III chipset • Antenna Gain: 3.5dB • Low power:3.3 V at 75 mA • Outputs NMEA sentences over serial connection • Master µc will parse NMEA to extract location & time data Anand

  11. Bluetooth • BlueSMiRF Gold Modem • Works for TX/RX from 9600 to 115200bps • Specifications • Power Consumption: 25mA • Operating Voltage:3.3V-6V • Frequency: 2.4-2.524GHz • Serial Communication:2400-115200bps Anand

  12. Bluetooth Schematic Anand

  13. Mp3 Players • LG Rumor II • Google G1 Android • Both support AVRCP Bluetooth protocol Anand

  14. Electrocardiogram Kristen

  15. ECG Schematic Kristen

  16. OPA2335 • Single supply CMOS operational Amplifier • Low Offset Voltage 5µV (max) • Zero Drift 0.05µV/°C (max) • Single-Supply Operation • MicroSize Packaging Kristen

  17. INA333 • Micro-Power, Zero-Drift, Rail-to-Rail Out Instrumentation Amplifier • Low Offset Voltage 25µV (max) • Low Drift 0.1µV/°C • Low Noise 50nV/ • Built in RFI filtered inputs • Micro Power • Microsize Kristen

  18. Electric Field Imaging • Proximity detection by measuring capacitance • MC33941 generates a high purity e-field by emitting a sine wave at a low frequency (125kHz) • Measuring attenuations suffered by this field

  19. Electric Field Imaging • When an object is brought close to an electrode an electric path is formed • This produces a change in e-field current • Sensor measures the AC impedance of the generated e-field and outputs a DC voltage • External microcontroller then processes the signal

  20. MC33941

  21. MC33941

  22. Electrode Array Greg

  23. Electrode Development Board Greg

  24. Data Acquisition Greg

  25. Electrode 1 to 4 Greg

  26. Electrode 2 to 3 Greg

  27. Electrode 2 to 4 Greg

  28. Electrode 3 to 4 Greg

  29. Clockwise Motion Greg

  30. Counter Clockwise Motion Greg

  31. Risks • Electromagnetic fields caused by surroundings • Weather/Shock Proofing • Inadequate resolution of sensing fields • Not being able to reduce size to what we want • Accelerometer might not function well in low temperatures Anand

  32. Budget Anand

  33. Division of Labor Anand

  34. Schedule John

  35. Goals • CDR • Sensing component working • First Milestone • Full prototype • Second Milestone • Prototype reworked to within size constraints • Capstone • Completely working Project John

  36. Questions?

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