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Taylor Holmes, Jason Partin , William Rody , Malcolm Stagg

Taylor Holmes, Jason Partin , William Rody , Malcolm Stagg. Recap of Project. A biometric device which functions as: Pedometer Calorie Counter Heart Rate Monitor Temperature Monitor Data will be used by students in a physics class for calculating power and work. Objective Review.

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Taylor Holmes, Jason Partin , William Rody , Malcolm Stagg

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  1. Taylor Holmes, Jason Partin, William Rody, Malcolm Stagg

  2. Recap of Project • A biometric device which functions as: • Pedometer • Calorie Counter • Heart Rate Monitor • Temperature Monitor • Data will be used by students in a physics class for calculating power and work

  3. Objective Review • Be able to measure and display heart rate • Be able to measure and display temperature • Be able to measure and display number of steps taken • Be able to calculate work done by user • Implement green energy

  4. Hardware • Accelerometers (as a pedometer) • Pulse Sensor • Thermistors • Solar cells • Li-ion battery

  5. Surface Mount Devices (SMDs) • Super – tiny parts (0.3mm x 0.5mm) • We will be soldering these to our PCB by ourselves!

  6. PCB Design • 1.5” x 1.5” actual size Original Design

  7. PCB Changes • Updated our schematic to correct some errors and use an updated charge circuit • Updated the PCB to pass the Design Rule Check, which is required for fabrication • “Metal pours” for lower ground resistance and lower signal noise • Improved parts placement • Silkscreen labels for soldering

  8. PCB Changes • 1.5” x 1.5” actual size Updated Design (Submitted for Manufacture)

  9. Coding • To this point, we have: • Found a library (FatFS) for creating a file system on the flash memory • Found TI USB interface libraries • Found library code for Sharp Memory LCD • Worked with TI Code Composer Studio to gain familiarity with the tools

  10. Enclosure Concept (from last semester) Rough dimensional conjecture for the interior compartment 32.5mm Transparent lid (acrylic or transparent polymer) 8 mm 47.5mm

  11. Enclosure Accomplishments • 3D-Printed a prototype enclosure • Used the StratasysDimension Elite(communication studio)

  12. Enclosure Challenges • We need more interior room, but a less bulky enclosure! • We’re currently workingon optimizing internalreal estate • Also need to figure out what went wrong withthe current printout

  13. Pulse Sensor • Low power optoisolatorin a small package • Specs: • Voltage = 3V to 5V • Current = 4mA at 5V

  14. Pulse Sensor • LED illuminates the skin • A phototransistorsenses the light’sreflection • Outputs an analog waveform to the microcontroller (Taylor’s pulse from fingertip)

  15. Pulse Sensor • Additional challenges • Filtering the signal • Coding the GPIO pins of our microcontroller

  16. Pedometer Objectives • Count within ±1 step for every 10 steps taken • Eliminate as many “false steps” as possible

  17. Pedometer Progress and Goals • Parts change (ADXL-345) • Waiting on PCB to run tests • Problem Identification • Set On/Off Mode to help accuracy • More useful for experimental purpose

  18. Thermometer • Measure skin temperature around the wrist • Measure before and after exercise • Uses 10k NTC Thermistor in voltage divider • 3 Equations

  19. Thermometer • Testing hasn’t started yet • Anticipate contact problem • Adjustable Wrist Strap

  20. Solar CellKXOB22-12X1 • 2 monocrystalline solar cells • KXOB22-12X1 instead of KXOB22-01X8 • Why? • Greater IV-Curve • 18.6mW • Isc = 50mA

  21. LTC3105Boost Converter • Step up DC/DC converter • Wide Vin range: 225mV to 5V

  22. Voltage RegulatorTPS78330 • TPS78330 instead of the LTC3100 • Why? • 5 pins (smaller & simple) • Fixed Output (3V) • Fewer Components

  23. To Do List & Challenges • Create an effective strap for the thermistor • Integrate all the systems with the microcontroller (Coding) • Solder all systems and test them • Create a smoother, more space-efficient enclosure

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