Vincent Piziali, Robert Sebastian, Pavan Bhatia, Callie Jacobs,

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Vincent Piziali, Robert Sebastian, Pavan Bhatia, Callie Jacobs,

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Vincent Piziali, Robert Sebastian, Pavan Bhatia, Callie Jacobs, He(Damon) Li, and Matthew Hayes ... Design an EAS-like RFID enabled unlocking system for pet ... – PowerPoint PPT presentation

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Title: Vincent Piziali, Robert Sebastian, Pavan Bhatia, Callie Jacobs,

1
RFID DOOR UNLOCKING SYSTEM
Vincent Piziali, Robert Sebastian, Pavan Bhatia,
Callie Jacobs, He(Damon) Li, and Matthew Hayes
vxp036000_at_utdallas.edu, ras033100_at_utdallas.edu,
pkb033000_at_utdallas.edu, crj031000_at_utdallas.edu,
mjh045000_at_utdallas.edu hxl043100_at_utdallas.edu
Department of Electrical Engineering Erik Jonsson
School of Engineering Computer
Science University of Texas at Dallas Richardson,
Texas 75083-0688, U.S.A.
Project Results
Project Goals

Receiver output without presence of tag
Receiver output with presence of tag

Design an EAS-like RFID enabled unlocking system
for pet door to provide protection from entrance
of unwanted animals into the home
Detect the presence of an RFID tag at a specified
frequency
Send signal to unlock servo-controlled door lock

Project Overview

Transmitter/VCO Voltage-controlled ring
oscillator takes input from microcontroller and
sets an output frequency of 13.36MHz - 13.56MHz.
The square wave signal is buffered and filtered
to produce a sine wave, which is amplified to a
/-15V output signal with a class-B amplifier.
This is output into a loop antenna.
Receiver A smaller loop antenna receives the
transmitted signal plus a small signal in the
opposite direction reflected by the tag. This
results in a small dip in the amplitude of the
response. The receiver amplifies the amplitude
of this signal and feeds it to the
microcontroller, which does the detection.
Microcontroller Software controls the frequency
sweep, detects the presence of the tag by reading
the response signal amplitude after each sweep
point. Provides system status information via
LEDs.

Transmitter
Project Conclusions/Outcomes

Completed planning of overall system
Designed and built individual system components
Receiver, transmitter, VCO, power supply, and
servo-controlling PWM
Successfully integrated system components to
detect presence of
RFID tag at 13.56MHz and to lock/unlock the door
depending on the tags presence
Learned to work in a team environment

Receiver
PWM
Power Supply

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