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

speakermicrophone

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