Final PresentationGlass Break Detection Team

11-16-10

Team Members

Dennis NarcissePic 24 Programming Synapse Programming

Matthew MarshSignal Processing Hardware Implementation

Christian East Opamp ConfigurationSignal Processing

Mark LynnHardware ImplementationTechnical Documentation

Advisor

Dr. Raymond Winton Advisor MOS Devices, RFIC, and ASIC

Introduction Problem Statement Solution

Constraints Technical Practical

Prototype Design Subsystem Testing System Testing Senior Design II Goals

Overview

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

Introduction

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

High cost for complicated designs

Problem

Use low power wireless technology Central unit communicates to all detection

units Simplified design to lower overall cost

Solution

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.

Technical Constraints

Visonic GE Linear Security GBDS0

50

100

150

200

250

300

350

Glass Break Detection Competition [4]

Practical Constraints

Manufacturability The GBDS must be simple in its design

Practical Constraints

Prototyping Design

Central Unit

Detection Unit

Sensing Block

Synapse Transmission Distance

Sensing Block Non-Inverting Gain Amplifier Low Pass Filter High Passer

Microphone Power Supply

Subsystem Testing

Transmission Distance We tested our transmission

distance outside Simrall to Patterson which is around well above our technical constraints

Synapse Distance

Synapse Distance

Distance (yds) Connectivity Expected Connectivity

1 97 % 99.9086 %

10 60 % 99.086

35 41 % 96.801

60 42 % 94.516

85 35 % 92.231

110 14 % 89.946

135 25 % 87.661

160 23 % 85.376

185 12 % 83.091

205 7 % 81.263

Non-Inverting Gain Amplifier

Non-Inverting Gain Amplifier

Sensing Block

Low Pass Filter

Low pass filter at 2kHz

Sensing Block

Low Pass Filter at 350 Hz

Sensing Block

High Pass Filter

High Pass Filter at 5kHz

Sensing Block

High Pass Filter at 15.5 kHz

Sensing Block

Attenuation Tables

Input Output

Gain Amplifier 280 mV 3.361

2 kHz 350 Hz

Low Pass Filter 2.16 V 3.52 V

5 kHz 15.5 kHz

High Pass Filter 680 mV 1.161 V

As we will show later in system testing our microphone has a range of 25 feet

This meets our range constraint

Microphone

We simulated glass break from various distances and implemented various thresholds to see which ADC values were most efficient at a certain range

Microphone Testing

Range (ft) Thud Level (ADC) Glass Level (ADC)

10 650 14

15 610 10

25 580 5

Power Supply

The central unit is wall powered by 120 Vac and stepped down to 3.3 V at the rails

The detection unit is battery powered with 3.3 V at the rails

120 VAC 6 VDC 3.3 Vrail

Central Unit 111.73 6.11 3.31

Detection Unit NA NA 3.31

System Testing

Constraints Successful

Range Yes

Accuracy Yes

Power Supply Yes

Transmission Distance Yes

Display Yes

Fulfilled Design Constraints

PCB design Packaging

wall mounted central unit detection unit

Senior Design II Goals

References

Questions