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Team 4 Baby Peas “ Pulse Early Alarm Sensor”

Team 4 Baby Peas “ Pulse Early Alarm Sensor”. Chris Ramirez Benjamin Goolsby Xin Tong Yowwu Lin. What is Baby Peas ???. Infants are weak Traditional monitors do not tell the whole picture Empirical data is needed Biomarkers can give peace of mind. Motivation. Motivation behind Product

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Team 4 Baby Peas “ Pulse Early Alarm Sensor”

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  1. Team 4Baby Peas“Pulse Early Alarm Sensor” Chris Ramirez Benjamin Goolsby Xin Tong Yowwu Lin

  2. What is Baby Peas ??? • Infants are weak • Traditional monitors do not tell the whole picture • Empirical data is needed • Biomarkers can give peace of mind

  3. Motivation • Motivation behind Product • SIDS • Infant’s insignificant ability to maintain homeostasis • Unable to express precise problems • Motivation behind education and skill set • RF design • Software design • Medical field

  4. Design Approach • SAFETY !!!! • Human Computer Interface • Usability • Functionality • Pulse • Temperature • Oxygen • Position

  5. Specifications

  6. Design Decisions • Low Power • Wireless • Ease of implementation • Vendor Support • Low Cost

  7. Subsystems

  8. Coin Cell Battery DC-DC regulator circuit Hardware Block Diagram Skin Temperature Sensor Circuit Heart Rate / Blood Oxygenation Sensor Circuit Body Position Sensor Circuit CC2541 Microcontroller Bluetooth BLE v4.0 RF module circuit BLE V4.0 compatible display device

  9. Central Processor • Low Power • Small and Mobile • Interface capability with multiple sensors • Interface capability with wireless devices

  10. CC2541 • Bluetooth SoC solution • SensorTag and Keyfob development kits valuable for reference design • 8051 MCU architecture • Five-Channel Direct Memory Access • I2C, SPI interfaces

  11. Peripherals • Pulse Oximeter • Measures blood oxygen saturation along with heart rate • TI AFE4490 • QFN package • 3V-3.6V • Temperature Sensor • Measures the temperature on Skin surface • TI TMP006 • Wafer Level Chip Scale • 2.4V-5.5V

  12. Peripheral technical specs • Body Position Sensor • Invensense MPU6000 • Gyro + Accelerometer • 3 axis for each • Capable of SPI and I2C interface • QFN package

  13. Communications

  14. Bluetooth Low Energy

  15. POWER • Texas Instruments TPS62740 step down DC-DC converter • 2MHz switching • Selectable output voltage range 1.8v-3.3v • Efficiency of 95%

  16. Power Schematics

  17. Power solution 2 • Linear Tech LTC3534 Buck-Boost DC/DC Converter • 2.4v-7v input range w/ 1.8-7v output • Use just 1 CR2032 battery

  18. Buck-Boost Schematic

  19. CC2541 Schematic

  20. Sensor Schematics

  21. Printed Circuit Board • Eagle Cadsoft • www.4PCB.com

  22. User Interface Design • Ease of use • Navigation • Menus • Conducive to the purpose of the device • Responsive

  23. Software Flow Charts

  24. Software UML Chart

  25. Ikea Instruction

  26. Concept Design

  27. Firmware Block Diagram Sensors Start Sample Data Setup and Init Registers Setup and Init SPI/I2C buses Export to Bluetooth

  28. Build • Soldering QFN packages and crystal oscillators w/ hot air pencil under 10x microscope • Solder remaining components with solder iron.

  29. Test

  30. Work Division

  31. Bill of Materials Item: Price (USD): Microprocessor CC2541 Free Sample AFE4490 Free Sample MPU6000 $10.72 TMP006 Free Sample TPS72430 Free Sample PCB x2 $132 Eagle Hobbyist Version $170 Sensor Tag $25 CC2541 Debugger $99 TI sponsor $-175 Miscellaneous $100 Total so far… $412.72 Expected Total $600.00

  32. Project Schedule

  33. Project Progress

  34. Remaining Problems • Everything • Board Layout learning curve • RF PCB Layout precision • Understanding Bluetooth Stack protocols • Firmware loading and timings • Mobile application learning curve • AFE4490 analog frontend schematic capture

  35. Thanks • Dr. Chan • Cadsoft Eagle staff • Texas Instruments • Dr. Richie • Ben’s parents • Chris’ wife • Xin Tong • Yowwu Lin • Christopher Ramirez • Ben Goolsby

  36. Any Questions ????

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