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ECE 477 Design Review Team 7 Spring 2011
Paste a photo of team members here, annotated with names of team members.
Stuart Pulliam
Will Granger Linda Stefanutti
Zach Smith
Outline• 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.
LCD screen
speakerK E YP A DATOM
Board
USB cable
LCD screen
speaker
LEDs
motionsensor smoke and
temperature
LCD screen
speaker
microphone
CMS
RSU
RSU
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
• very compact and lightweight design
• remote system management
• easy installation
Control Panel Wireless Alarm Kit
DSC Wireless Ready Alarm System Kit
• logging capability • Straightforward keypad
interface• Integrated wireless
sensors
Schematic/Theory of Operation Central monitoring station
• D945GSEJT Atom board– 5 modes of operations
• 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 OperationRemote 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 OperationRemote sensor unit
• Analog signals: smoke detector, microphone and temperature sensor
Schematic/Theory of OperationRemote sensor unit
• Digital signals: motion sensor, speaker, LEDs
Schematic/Theory of OperationRemote 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
ANALOG AREA
POWER AREA
DIGITAL AREA
MICRO
XBee
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• 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