Glass Break Detection System

Midterm PresentationOctober 7, 2010

Team Members

Dennis NarcisseSynapse Programming and troubleshooting

Matthew Marsh Hardware Design, Signal Processing

Christian East Synapse Wireless Comm.

Mark Lynn Hardware Implementation , Signal Processing

Dr. WintonAdvisor

Overview

Introduction Problem Statement Solution

Constraints Technical Practical

Hardware Diagram Technical Tradeoffs Progress Timeline

Introduction

Glass Break Detection System (GBDS) is an alarm system that detects the frequency of breaking glass

Consist of a central unit and multiple detection units

System communicates wirelessly among all units

Problem

Current glass break alarms operate: as stand alone units hardwired to a central unit

High cost for complicated designs

Solution

Use low power wireless technology

Central unit communicates to all detection units

Simplified design to lower overall cost

System Overview

Central Unit

Detection Unit

Detection Unit

Technical Design Constraints

Name Description

Range The detection unit must detect glass breaking up to 25 feet.

Accuracy The detection unit must detect the noise frequency emitted by the breaking of glass to prevent false alarms from normal household sounds.

Supply Voltage The detection units must be battery powered. The central unit must be wall powered.

Transmission Distance Central and detection units must be able to wirelessly communicate within a 33 to 246-ft range.

Display The central unit must have a display screen that is easily read.

Practical Constraints

Economic The GDBS must be less than $200

Viso

nic

GE

Line

ar S

ecur

ity

GDBS0

100

200

300

400

Glass Break Prices

Glass Break Prices

Practical Constraints

Manufacturability The GBDS must be simple in its design

Hardware Diagram

Sensing Block MCU Wireless

Comm.

Display MCU Wireless Comm.

Sensing Block Diagram

Microphone Op amp Op amp

MCU

Technical Tradeoffs

WirelessZigbeeSynapseTexas Instruments

Signal ProcessingHardware Software

Zigbee

XBee Pro Data Rate: 250 kbps Indoor Range: 300 ft Frequency Band: 2.4 GHz

Synapse

RF100PC6 Data Rate: 250 kbps Indoor Range: 1000 ft Frequency Band: 2.4 GHz

Texas Instruments

CC2500 Data Rate: 250 kbps Indoor Range: 260 ft Frequency Band: 2.4 GHz

Wireless

Manufacturer

Model Resources

Range

Price

Choice

Zigbee XBee Pro No 300’ $32

Synapse RF100PC6

Yes 1000’ $35

TI CC2500 No 240’ $5

Signal Processing

Hardware Op amp

Software Mathematically

Hardware

Op amp Adsf Asdf asdf

Software

Mathematically Adsf Adsfa asdfas

Signal Processing

Part Speed

Accuracy

Difficulty

Choice

Opamp Faster Less Less

Mathematically

Slower

More More

Progress

Central and detection unit’s hardware completed

Progress

Beginning to program microprocessor, wireless network, and display

Timeline

August September October November

Research

Hardware

Software

Testing

References

[1] Abel, W.E., Marman, D.H., “Glass Break Detector,” U.S. Patent no. 4837558, Jun. 1989. [2] Texas Instruments, “Glass Break Detector”. http://focus.ti.com/docs/solution/folders/print/489.html [3] ZigBee Alliance, “FAQ”. http://www.zigbee.org/About/FAQ.aspx [4] Home Security Store. Glass Break Detectors. 2010. http://www.homesecuritystore.com/c-76-glass-break-detectors.aspx

Questions?