Final Presentation Glass Break Detection Team 11-16-10.
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Transcript of Final Presentation Glass Break Detection Team 11-16-10.
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