CELL PHONE SECURITY SYSTEM
A Design Project Report
Presented to the Engineering Division of the Graduate School
of Cornell University
in Partial Fulfillment of the Requirements for the Degree of
Master of Engineering (Electrical)
by
Jason Chiang
Project Advisor: Bruce Land
Degree Date: May 2006
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Abstract
Master of Electrical Engineering Program
Cornell University
Design Project Report
Project Title: Cell Phone Security System
Author: Jason Chiang
Abstract: Keyless entry has been a luxury whose availability is confined primarily to
vehicles. The cell phone security system takes this idea of keyless entry and transforms it
into a convenient, versatile security system that utilizes cell phone technology and the
landline telephone network. By taking advantage of caller identification and dual-tone
multi-frequency signaling, the security system has the ability to introduce two-levels of
security. The first level will be decoding the calling party’s identification information
while the second level would consist of the user attempting a password entry over the
phone. The system also has the ability to provide feedback to the user regarding the state
of the system through a special user mode. By combining the mobility of this
telecommunication medium with microcontrollers, the system achieves a secure,
convenient, and automated form of security for a place of residence.
Report Approved by
Project Advisor: __________________________________________Date: ___________
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Executive Summary
The cell phone security system was able to achieve its goals of introducing an
automated and versatile security system using the telephone network through principles
of caller identification and DTMF signaling. It successfully interfaced with both the
caller ID and DTMF protocols. By utilizing the HT9032C Caller ID Receiver, the system
is able to successfully decode the caller ID data packets sent on the phone line. This