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Project Orion TekBand

Project Orion TekBand. Cam Proctor Ramsey Khudairi Tom Gilbert Chad Young. Outline. Motivation Design Band & Mold Microcontroller Bluetooth Battery Memory Q&A. Motivation – Cellular Phone Interface. Call, Text, & Emergency Notification Uses: During Meetings In Class On the Road

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Project Orion TekBand

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  1. Project OrionTekBand Cam Proctor Ramsey Khudairi Tom Gilbert Chad Young

  2. Outline • Motivation • Design • Band & Mold • Microcontroller • Bluetooth • Battery • Memory • Q&A

  3. Motivation – Cellular Phone Interface • Call, Text, & Emergency Notification • Uses: • During Meetings • In Class • On the Road • Will lead to: • Safer Driving • Less Interruptions

  4. Motivation – Wireless Storage • Wireless Data Storage • Uses: • On the run • During group projects • Will lead to: • Protection from Identity Theft • Fewer lost files • Greater Convenience

  5. Design • Goals: • Interface with Cell Phone to alert user of calls and messages • Interface with PC to program the band • Interface with PC as wireless storage device • Maintain Fashion & Style • Our wristband will contain: • Microcontroller • Bluetooth module • MicroSDcard • Lithium ion battery

  6. The Band-Materials

  7. The Band-Construction • Target Size: 200mm x 5mm x 22mm • Two-Part Silicone Rubber • 1:1 Ratio • Pour in mold • Cure time of a few hours • Can be bought at any local craft store • ~$20/lb.

  8. The Mold • Silicone • Rubber-To-Rubber mold release • Master mold • Mold poured around wooden band • Other options • Putty • www.amazingmoldputty.com

  9. The Clasp Neodymium Rod Magnets ~$10-$20 Trials

  10. Microcontroller Considerations • Form factor • Must be small enough to fit inside band • Low power • Running continuously • Interface with peripherals • I/O for user control • Interface with Bluetooth module • Read/Write to storage media

  11. Microcontroller Capabilities • I/O • 3 pins to drive single tri-color LED • Possible analog inputs for gyro, microphone, etc. • SPI (Serial Peripheral Interface) • Read/Write MicroSD card • Communicate with Bluetooth module (KC-21) • UART (Universal asynchronous receiver/transmitter) • Data transfer from Bluetooth module (KC-21, BTM-182)

  12. Microcontroller Solutions

  13. Best Candidates • PIC16F1827 (Microchip) • Good middle ground • 2 SPI ports • Low power • Small size, multiple chips… • PIC16F1938 (Microchip) • Large program memory • Small form factor • Higher cost • Greater power consumption, critical

  14. Selecting a Microcontroller • PIC16F1827 (Microchip) • Appears to be the ideal candidate • Low power and cost • Small size, possibility for >1 chip in bracelet • 2 SPI ports and USART • Start with this chip, others as fallback • Middle of the road – good starting point

  15. Selecting a Bluetooth

  16. Bluetooth modules • * Does not come with an antenna • ** Not yet available on the market

  17. Battery Considerations • Form factor • Small enough to fit inside band (< 20mm wide x 2mm thick) • Capacity: 100mAh • Approx. 100mA during read/write to MicroSD • Approx. 90mA during Bluetooth transmit • Must be rechargeable • Wireless Charging • Strategy: Multiple Small Batteries

  18. Battery Options • Coin Cell: • Thin Film Surface Mount:

  19. Battery Form Factor Considerations ML621 6.8mm 5mAh ML2020 20mm 45mAh MS920SE 9.5mm 11mAh 50mm (1/4 of total band length) MS920SE 12mm 17mAh 20mm CBC050 8mm 50uAh

  20. 4GB Memory – Possible Add-on • MicroSD • Small – 11mm X 15mm X 1mm • Voltage Range: 2.7 – 3.6V • Clock Rate: 0 – 25MHz • Supports Serial Peripheral Interface (SPI) • Assuming 25MHz clock, Read/Write time: 40s/Gb • Power: • Sleep – 150uA max • Read – 100mA max • Write – 100mA max • Cost: $3 - $5 • Performance: -25oC to 85oC

  21. MicroSD Communication • Serial Peripheral Interface (SPI) protocol • Data clocked with clock signal (SCK) • Clock signal controls when data is changed and read • SPI is Sychronous • Data rate will change to accommodate changing clock rate • SSP or MSSP module in PICmicro device allows SPI

  22. Timeline M D R

  23. Budget • Band Construction • Supplies for 10 Bands & Mold: $60 • Rubber to rubber mold release: $10 • 100 Magnets: $20 • Total: $90 • Bluetooth • Module: $40 • Development Kit: $100-$150 (depending on module) • Total: $140-$190 • Microcontroller • Module: $1.20 • Breakout Board & Dev Kit: $165 • MicroSD • Module: $3-$5

  24. Conclusion • Our wristband will contain: • Microcontroller • Bluetooth module • microSD card • The final product will: • Interface with Cell Phone to alert user of calls and messages • Interface with PC to program alert preferences • Possible Addition: Interface with PC as wireless storage device • Key constraints: Power and Size • Deliverables by MDR: • Prototype of electronics working on board • Prototype wristband w/o HW

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