Final Presentation Glass Break Detection Team

Team Members Dennis Narcisse Pic 24 Programming Synapse Programming Matthew Marsh Signal Processing Hardware Implementation Christian East Opamp Configuration Signal Processing Mark Lynn Hardware Implementation Technical 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

NameDescription RangeThe detection unit must detect glass breaking up to 25 feet. AccuracyThe detection unit must detect the noise frequency emitted by the breaking of glass to prevent false alarms from normal household sounds. Supply VoltageThe detection units must be battery powered. The central unit must be wall powered. Transmission DistanceCentral and detection units must be able to wirelessly communicate within a 33 to 246-ft range. DisplayThe central unit must have a display screen that is easily read. Technical Constraints

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

Distance (yds)ConnectivityExpected Connectivity 197 % % 1060 % % % % % % % % %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 InputOutput Gain Amplifier280 mV kHz350 Hz Low Pass Filter2.16 V3.52 V 5 kHz15.5 kHz High Pass Filter680 mV1.161 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)

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 VAC6 VDC3.3 Vrail Central Unit Detection UnitNA 3.31

System Testing

ConstraintsSuccessful RangeYes AccuracyYes Power SupplyYes Transmission DistanceYes DisplayYes Fulfilled Design Constraints

 PCB design  Packaging  wall mounted central unit  detection unit Senior Design II Goals

References

Questions