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Unobtrusive Directional Occupancy Counter

Unobtrusive Directional Occupancy Counter. William Case Neeraj Chemburkar Christopher Cody Team 39, TA: Drew Handler. Objectives. Develop product to determine classroom occupancy Cost effective solution Unobtrusive Low power Low maintenance Easy installation

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Unobtrusive Directional Occupancy Counter

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  1. Unobtrusive Directional Occupancy Counter William Case NeerajChemburkar Christopher Cody Team 39, TA: Drew Handler

  2. Objectives • Develop product to determine classroom occupancy • Cost effective solution • Unobtrusive • Low power • Low maintenance • Easy installation • Support for multiple doors • 90% accuracy

  3. Top-Level Block Diagram

  4. Sensor Board A/B Block Diagram

  5. Sensor Board Schematic

  6. Base Station Block Diagram

  7. Base Station Schematic

  8. Basic Requirements

  9. Power Supplies Sensor Board • 9V battery source • Voltage regulators • 5VDC and 3.3VDC Base Station • Wall-wart supply • output 5VDC and 3.3VDC

  10. PIR Sensor Dual Type Pyroelectric Infrared Sensor IRA-E700 Series schematic

  11. Sensor Interface PIR

  12. Expected Output

  13. Correct Measured Output T_OUT D_OUT

  14. Incorrect Measured Output T_OUT D_OUT

  15. Results Pros Cons Random third spike Radial Sensing • Able to bi-directionally detect motion • One sensor per door • Long range of sensing • Able to output clear digital waveforms • according to direction

  16. Microcontrollers Texas Instruments MSP430G2553 Multiple low power modes 16 GPIO pins Built in UART, timer peripherals

  17. Sensor Board Controller Functions Sensing algorithm Wait for pulse from D_OUT Check value of T_OUT shortly after first pulse Wait for T_OUT transition and evaluate direction • Interprets outputs from sensors • Stores temporary count and channel identifier • Sends count to transmitter • Change channels on button inputs

  18. Sensor Software Flow

  19. Base Station Controller • Interprets incoming data from receiver • Only accepts data on the correct channel • Stores total room count • Sends count to WiFi module over UART

  20. Base Station Software Flow

  21. RF Modules • Sparkfun 434 MHz transmitter and receiver • Usable package • Up to 500 ft. range

  22. Transmission Scheme • Avoid corruption from noise • Easily interpretable • Low pulse followed by: • Short high = “1” • Long high = “0”

  23. Measured Transmission Output CHANNEL DATA START “6”0110 “08”0000 1000 “A”1010 “F”1111

  24. WizFi210 WiFi module • UART • Enterprise Connectivity • Auto-reconnect to network • IP address identification • Potential use for CITES • Example Information • “Count: 43”

  25. Power Saving • Single PIR • Separation of modules • Enable bit for transmitter • MCU • Interrupt function • Low power mode • Display control

  26. Future Improvements • Testing more/different PIR sensors • Custom fresnel lens • Two individual PIRs per sensor board • Stronger detection algorithm • One base station for multiple rooms • Two-way communication with the base station and CITES

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