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  1. 1. Preliminary Design Review Capstone Lab 2009 Steven Sorenson Anand Suchak John Strueber Greg Smith Kristen Aragon
  2. 2. <ul><li>Overview </li></ul><ul><li>Core Functionality </li></ul><ul><li>System Breakdown </li></ul><ul><li>Risks </li></ul><ul><li>Contingency Plans </li></ul><ul><li>Possible Extensions </li></ul><ul><li>Budget </li></ul><ul><li>Division of Labor </li></ul><ul><li>Schedule </li></ul><ul><li>Questions </li></ul>Anand
  3. 3. <ul><li>We will be creating an interface for a G1 Android phone to allow for button-less control. </li></ul><ul><li>The sensing device will track the user’s hand gestures to control basic phone functions. </li></ul><ul><li>This would be useful in situations where you cannot easily access the phone i.e. skiing, snowboarding, running, etc. </li></ul>Anand
  4. 4. <ul><li>Song Control </li></ul><ul><ul><li>Previous/Next track </li></ul></ul><ul><ul><li>Play/Pause </li></ul></ul><ul><ul><li>Volume Up/Down </li></ul></ul><ul><li>Wireless Control </li></ul>Anand
  5. 5. Greg
  6. 6. <ul><li>Changes in the electric field sensed by an array of transmit and receive electrodes will be used to pinpoint the user’s hand in an x-y plane </li></ul><ul><li>Data stored in SRAM (no refresh cycles, data buses are directly accessible) </li></ul><ul><li>Trilateration calculations on the collected data will be performed in firmware and compared with LUTs </li></ul>Greg
  7. 7. <ul><li>The signal received by the receive electrode will be an attenuated and phase shifted version of the transmitted signal </li></ul><ul><li>Attenuation will increase as a conductive body (the user’s hand) is introduced into the field </li></ul><ul><li>Level of attenuation will be transformed into a magnitude that corresponds to the radius of a circle centered on the receiving electrodes </li></ul><ul><li>Intersection of the 4 circles will denote x-y coordinates </li></ul>Greg
  8. 8. d 2 d 1 d 3 d 4 Greg Rx Rx Rx Rx Tx
  9. 9. <ul><li>Needs to control several things: </li></ul><ul><ul><li>Interface sensors </li></ul></ul><ul><ul><ul><li>Interpretation </li></ul></ul></ul><ul><ul><li>Network devices </li></ul></ul><ul><ul><li>Possible song digestion </li></ul></ul><ul><ul><li>Possible control signal transfer/digestion </li></ul></ul><ul><li>Needs to have an A to D converter </li></ul>Steven
  10. 10. <ul><li>Speed: 20 MHz </li></ul><ul><li>SRAM 128 B </li></ul><ul><li>Flash: 2 KB </li></ul><ul><li>10-bit A-D Converter </li></ul><ul><li>Watchdog Timer </li></ul><ul><li>2-wire Serial Interface </li></ul><ul><li>2 external 19 internal interrupts </li></ul>Steven
  11. 11. <ul><li>Features needed of the battery: </li></ul><ul><ul><li>Be light weight and small in size </li></ul></ul><ul><ul><li>Retain charge for a long period of time </li></ul></ul><ul><ul><li>Be rechargeable </li></ul></ul><ul><ul><li>Have a voltage of above 6 volts </li></ul></ul>Steven
  12. 12. <ul><li>The battery that will use is a Polymer Lithium Ion Battery </li></ul><ul><li>Specifications: </li></ul><ul><ul><li>Weight: 0.77oz </li></ul></ul><ul><ul><li>Dimensions: 0.23x1.32x1.86” </li></ul></ul><ul><ul><li>3.7 V at 1100mAh </li></ul></ul><ul><ul><ul><li>Will need two </li></ul></ul></ul>Steven
  13. 13. <ul><li>Serial Communication bus between microcontroller and Bluetooth modem </li></ul><ul><li>Transmits media player control signals using AVRCP Bluetooth protocol </li></ul><ul><li>Our Bluetooth will pair with the Bluetooth receiver embedded on the phone </li></ul>John
  14. 14. <ul><li>BlueSMiRF Gold Modem </li></ul><ul><ul><li>Works for TX/RX from 9600 to 115200bps </li></ul></ul><ul><li>Specifications </li></ul><ul><ul><li>Power Consumption: 25mA </li></ul></ul><ul><ul><li>Operating Voltage:3.3V-6V </li></ul></ul><ul><ul><li>Frequency: 2.4-2.524GHz </li></ul></ul><ul><ul><li>Serial Communication:2400-115200bps </li></ul></ul>John
  15. 15. <ul><li>Electromagnetic fields caused by surroundings </li></ul><ul><li>Weather/Shock Proofing </li></ul><ul><li>Inadequate resolution of sensing fields </li></ul>John
  16. 16. <ul><li>Sensors </li></ul><ul><ul><li>Revert to less complex sensing technique (accelerometer glove) </li></ul></ul><ul><li>Bluetooth interference with sensing device </li></ul><ul><ul><li>May have to go to USB </li></ul></ul><ul><li>Interfacing with T-Mobile G1 Android </li></ul>John
  17. 17. <ul><li>Interface with smart phone </li></ul><ul><li>Implement new gestures for more controls such as receive calls </li></ul><ul><li>GPS tracking and mapping </li></ul><ul><li>Means of controlling peripheral device </li></ul><ul><li>Gaming on Android </li></ul>Kristen
  18. 18. Kristen Component Product Quantity Cost Microcontroller AVR ATTiny261 3 $7.50 PCBs 4 $132 Flash Memory (1Mb) $65 Bluetooth Modem BlueSMiRF Gold (WRL-00582) 1 $65 Android Phone T-Mobile G1 1 $200 Push Button 1 $2 Battery Lithium Ion Polymer Lithium Ion 2 $25 Housing Components ? $150 Miscellaneous Parts $200 Estimated total $1000 Calculated total ATM $839
  19. 19. Kristen
  20. 20. Kristen
  21. 21. <ul><li>CDR </li></ul><ul><ul><li>Sensing component working </li></ul></ul><ul><li>First Milestone </li></ul><ul><ul><li>Full prototype </li></ul></ul><ul><li>Second Milestone </li></ul><ul><ul><li>Prototype reworked to within size constraints </li></ul></ul><ul><li>Capstone </li></ul><ul><ul><li>Completely working Project </li></ul></ul>