introduction

Introduction

• Problem statement• Key requirements

Size Power Accuracy

Agenda

• System Overview• Hardware• Firmware• Software• Deployment• Results• Conclusions

System Overview

Agenda

Hardware

• Deviceso Tago Detectoro Proxy

• Componentso RF12 transceivero ATmega328p MCUo WiFly 802.11b/g transceiver

• Schematic and layout by Eagle CAD• PCB by Sunstone

Hardware

• Tag

ProductLayout

Hardware

• Detectoro RF12 transceivero ATmega328p MCUo Status LEDo Size: 3.5” x 1”

Product

Layout

Hardware

• Proxyo RF12 transceivero ATmega328p MCUo WiFly 802.11b/g transceivero Breadboard prototypeo Ceramic antenna

Agenda

Firmware

• IMAGE

Firmware

• Tago Mostly in low power stateo Periodically wakes up to broadcast

• Detectoro Listen for messages from tags and other detectorso Controlled floodingo Collision avoidance via time division

• Proxyo Listens for messages from detectorso Forwards messages to Controller

• Generallyo All speak a common message format which includes

Battery Information Infrastructure for a more sophisticated routing protocol Fixed length

Agenda

Software

• Controllero Collects data from Proxyo Feed data to Location Engineo 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

Software

Agenda

introduction

proxyfeed data

sorts data

location enginecollects

location enginetwo

detectorsforwards messages

location enginestores

bg transceiverschematic

eagle cadpcb

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