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SECE Location Tracking

This project aims to implement an indoor tracking system that identifies the room in a building where specific objects are located. By placing "tags" on the items and "beacons" in designated areas, the system utilizes low-powered wireless transmissions to report the proximity of each tagged item to its nearest beacon. With optimized power consumption, the beacons and tags conserve energy by synchronizing sleep modes. The technology leverages a mesh network for seamless communication, allowing tags to relay messages to the Arduino-based beacons while continuously refining signal strength readings for accurate location tracking.

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SECE Location Tracking

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  1. SECE Location Tracking • Goal: • Track what room in a building objects are in • Pass information to SECE • Implementation: • “Tags” are placed on items to be tracked • “Beacons” are placed in locations that should track tags

  2. Beacons • Beacons periodically transmit wirelessly • Telling the location that a beacon is present • Transmission is low powered – penetration of other locations is minimized • Indicate connection status + Location #1 Location #2 PIC Beacon Arduino Beacon

  3. Beacon Types • PIC • Low power usage: can run on battery for extended periods of time • Hard to communicate with TCP/IP • Arduino • Heavier power usage • Easier to communicate with TCP/IP using existing libraries +

  4. Tags • Tags receive messages from beacons (1) • Capture signal strength of message • Determines which beacon is closest based on signal strength (2) • Transmit closest beacon ID to SECE when it changes (3) + Highest Signal Strength Tag (2) Closest Beacon ID (3) (1) Lower Signal Strength Lower Signal Strength (1) (1) Lower Signal Strength

  5. Technical Details • Wireless uses mesh network – no central node is needed • Beacons and tags sleep at the same time to conserve power • Syncing of sleep time is achieved through wireless protocol • Beacons broadcast messages through network but do not relay messages from other beacons • Tags send messages directly to Arduino beacon – messages are relayed through other beacons • Signal strength delivered to PIC from XBee via pulse width modulation

  6. Power Consumption (No Sleep)

  7. Power Consumption (Sleep)

  8. Future Work • Improve signal strength readings • Can use average signal strength readings over a period of time • Report beacon battery status • Tag “panic” button • Tag out of range detection • Prevent lost messages

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