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Introduction

This document provides an in-depth analysis of a cutting-edge RF-based location tracking system. It covers the problem statement, system overview, and key requirements, including size, power, and accuracy. The design features an ATmega328p microcontroller paired with RF12 and WiFly transceivers. The firmware operates primarily in low-power states, facilitating efficient communication through controlled flooding and collision avoidance mechanisms. The software component emphasizes data collection, calibration, and results storage in a MySQL database, ensuring accurate location tracking and efficient data processing.

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Introduction

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Presentation Transcript

  1. Introduction • Problem statement • Key requirements • Size • Power • Accuracy

  2. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

  3. System Overview

  4. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

  5. Hardware • Devices • Tag • Detector • Proxy • Components • RF12 transceiver • ATmega328p MCU • WiFly 802.11b/g transceiver • Schematic and layout by Eagle CAD • PCB by Sunstone

  6. Hardware • Tag Product Layout

  7. Hardware • Detector • RF12 transceiver • ATmega328p MCU • Status LED • Size: 3.5” x 1” Product Layout

  8. Hardware • Proxy • RF12 transceiver • ATmega328p MCU • WiFly 802.11b/g transceiver • Breadboard prototype • Ceramic antenna

  9. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

  10. Firmware • IMAGE

  11. Firmware • Tag • Mostly in low power state • Periodically wakes up to broadcast • Detector • Listen for messages from tags and other detectors • Controlled flooding • Collision avoidance via time division • Proxy • Listens for messages from detectors • Forwards messages to Controller • Generally • All speak a common message format which includes • Battery Information • Infrastructure for a more sophisticated routing protocol • Fixed length

  12. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

  13. Software • Controller • Collects data from Proxy • Feed data to Location Engine • Two operating modes • Calibrating • Collects RF signature at calibration points • Stores calibration data in a local database • Locating • Passes calibration data to Location Engine • Collects and sorts data into packets • Feeds the packets to Location Engine • Stores results in MySQL Database

  14. Software

  15. Software

  16. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

  17. Agenda • System Overview • Hardware • Firmware • Software • Deployment • Results • Conclusions

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