Transcript Senior Design Presentation Fall 2008

History

Justin Project
› Justin Moninger
 Car Accident

Different Technologies
› 300Mhz
› 433mhz
Version 1.0

Transmitter/Receiver
› 433Mhz
› Accelerometer
› Comparator
› Dip Switches
Accomplishments

Goals Met
› No User Input
› Range
› $$$ - Cheap
› Weather Proof
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
Budget

Budget from CSU
› $50 dollars per individual
 Total 100 dollars
 (2 Students are from independent study)
Donations

Sources
› Monetary
› Transceivers
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
Transceiver Donations

Panasonic
› Zibee Modem P4555

Linear Technologies
› RS2802 Tranceiver

Vishay
› Vishay RFW3M
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
Chair Circuit
Test Setup
Schematic
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.
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
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
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