ECE 477 Design Review
Team 7  Spring 2011
Paste a photo of team members here,
annotated with names of team members.
Stuart
Pulliam
Zach
Smith
Will Granger
Linda Stefanutti
Outline
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Project overview
Project-specific success criteria
Block diagram
Component selection rationale
Packaging design
Schematic and theory of operation
PCB layout
Software design/development status
Project completion timeline
Questions / discussion
Project Overview
• Home security system based on a central
monitoring station (CMS) running a web
server and communicating wirelessly with
two remote sensor units(RSU). The RSU
controlled by the microcontroller will control
: a smoke detector, a motion detector, a
temperature sensor, a noise detector and a
speaker.
RSU
LCD screen
RSU
speaker
LEDs
microphone
LCD screen
speaker
motion
sensor
smoke and
temperature
LCD screen
USB cable
ATOM
Board
speaker
K E Y
P A D
CMS
Project-Specific Success Criteria
• An ability to detect motion based on temperature variance,
noise above 90dB, the presence of smoke/combustion with a
photoelectric amplifier, and to measure temperature with a
thermocouple amplifier.
• An ability to encode and transmit data packets wirelessly
to/from the remote sensors with a sensor identification address
included in each packet.
• An ability to arm/disarm the security system and to alert the
user (visually, audibly, and through email) of emergency
conditions from both the CMS and the remote sensor units.
• An ability to time stamp events and log them in non-volatile
memory on the CMS.
• An ability to display event logs and operational status on an
LCD as well as a webpage hosted by an embedded web server.
Block Diagram - CMS
Block Diagram -RSU
Component Selection Rationale
• Computer platform
– Intel Atom board vs Asus wireless router
• Microcontroller
– Freescale MC9S12C vs Microchip PIC18F25K22
• Wireless module
– MRF24WB0MA Wi-Fi vs WRL-08665 XBee
Packaging Design
• logging capability
• Straightforward keypad
interface
• Integrated wireless
sensors
DSC Wireless Ready
Alarm System Kit
• very compact and
lightweight design
• remote system
management
• easy installation
Control Panel
Wireless Alarm Kit
Schematic/Theory of Operation
Central monitoring station
• D945GSEJT Atom board
– 5 modes of operations
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Change Password
Activate In-Home/Out-Home mode
Status Conditions
Stop an Active Alarm
– Database with SQL Server 2005
– Activate/De-activate alarm with Internet App
– Bidirectional communication
Schematic/Theory of Operation
Remote sensor unit
• Freescale 9S12C32 :
• frequency: 24MHz
• voltage: 5V regulated
• Idle state:
• LCD : room temperature
• green light
• Alarm state:
• LCD: sensor triggered
• red light
Schematic/Theory of Operation
Remote sensor unit
• Analog signals: smoke detector, microphone
and temperature sensor
Schematic/Theory of Operation
Remote sensor unit
• Digital signals: motion sensor, speaker,
LEDs
Schematic/Theory of Operation
Remote sensor unit
PCB Layout
• Four area division: digital, analog, power,
XBee
• Microcontroller: 9S12C module
• EMI sources: power, XBee, speaker
• Sensitive devices: microphone
• Trace width:
– 40-60mils for power/ground
– 10-12mils for the other signals
• Voltage translators
PCB areas
XBee
POWER AREA
MICRO
ANALOG AREA
DIGITAL AREA
Software Design/Development Status
• Atom board
– C# .NET
• Web Application
• Main Program
– Apache or IIS 5.1 for Web Server Software
– SQL Database
• loginTable, Remote1Table, Remote2Table
• Microcontroller - MC9S12C
– Assembly
Project Completion Timeline
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Week 8 (03/04):
– start prototyping sensors with the micro
Week 9 (03/11):
– finalize PCB layout
– prototype Xbee module with micro
Week 11(03/25):
– test PCB board in separate sections: power, microcontroller,
analog signals, XBee, digital signals
Week 12 (04/01):
– interface key-pad and LCD screen with the Atom board
Week 13 (04/08):
– Successfully transfer information from Atom board to Web Server
– Bidirectional communication among CMS and the two RSU
Week 14 (04/15):
– email service in alarm state
– packaging
Questions / Discussion