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Redesigning a Low-Power Transmitter for Directional Signal Propagation

This project aims to redesign a low-power transmitter for directional signal propagation, incorporating different technologies and addressing previous power and enclosure issues. Accomplishments and future plans are discussed, along with sources of donations and a budget allocation.

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Redesigning a Low-Power Transmitter for Directional Signal Propagation

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  1. History • Justin Project • Justin Moninger • Car Accident • Different Technologies • 300Mhz • 433mhz

  2. Version 1.0 • Transmitter/Receiver • 433Mhz • Accelerometer • Comparator • Dip Switches

  3. Accomplishments • Goals Met • No User Input • Range • $$$ - Cheap • Weather Proof

  4. Issues and Problems • Problems • Excessive Power Use • Charging Circuit • Cumbersome Enclosure • Project Goals for this Year • Redesign to use less power • Design a smaller transmitter • Incorporate directional signal propagation

  5. Budget • Budget from CSU • $50 dollars per individual • Total 100 dollars • (2 Students are from independent study)‏

  6. Donations • Sources • Monetary • Transceivers

  7. Monetary Donations • Trusts and Foundations • Kroh Charitable Trust • Loveland, CO – Focused on helping Community • Anheuser Busch • Justin Moniger had a close friend working here • Anshutz Foundation • A foundation focused on helping society • Craig H Nielson Foundation • Similar to Anshutz

  8. Transceiver Donations • Panasonic • Zibee Modem P4555 • Linear Technologies • RS2802 Tranceiver • Vishay • Vishay RFW3M

  9. Transceivers • Panasonic (Zigbee Modem)‏ • High level communication protocols (WPANs)‏ • 16 channels, size (20 digital I/O lines), Power (120mW)‏ • Vishay (RFW3M)‏ • Power (129mW), frequency agility (3 operating channels)‏ • A three wire serial bus for programming (data lost)‏ • Vishay (RFW122)‏ • Power = 22mA×3.3V = 72.6 mW (Transmitting mode)‏ • Amplitude Shift Keying (ASK)‏ • 3 line serial digital data I/O line interface

  10. Chair Circuit Test Setup Schematic

  11. Chair Circuit Specifications • Needed to limit current consumption • Changed to CMOS 555 timer circuits • Used Linear Voltage Regulator • Used CMOS inverter • Changed to Vishay Transceiver • Much less power consumption • 11 X 15.9 mm • Transmit and Receive for future handshake applications.

  12. Antenna Design • Needed Characteristics • Directional • Easy to make • Work with Vishay • Solution • Dipole Antenna http://en.wikipedia.org/wiki/Dipole_antenna http://www.trevormarshall.com/byte_articles/byte1.htm

  13. Future Circuit Plans • Future plans for Door Circuit • Need to filter out transmitted signal • Vishay outputs noise when not receiving signal. • Need to filter out unwanted signal. • Use Vishay's abilities to do handshake • Future plans for Chair Circuit • Make circuit rechargeable. • Put circuit on PCB

  14. Thanks Too • Advisor: Olivera Notaros • Donations: • Ashley Waddell • Patty Meeke of Panasonic • Leanne Bernstein of Vishay • Christopher Gobak of Linear Technologies • Guy Wagner for support • Pat and Terry for continued support

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