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Wireless Home Security System Design and Implementation Overview

This document outlines a spring 2011 project from Team 7 of ECE 477, focusing on the design and implementation of a wireless home security system. The system includes a central monitoring station (CMS) that communicates with remote sensor units (RSUs) equipped with various detectors (smoke, motion, temperature, noise) and alerting mechanisms. Key success criteria, component selection rationale, schematic designs, and the development status of the software are discussed, alongside a detailed project timeline.

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Wireless Home Security System Design and Implementation Overview

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  1. 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

  2. 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

  3. 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.

  4. RSU LCD screen RSU speaker microphone LEDs LCD screen speaker motion sensor smoke and temperature USB cable LCD screen K E Y ATOM Board speaker P A D CMS

  5. 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.

  6. Block Diagram - CMS

  7. Block Diagram -RSU

  8. 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

  9. Packaging Design • logging capability • Straightforward keypad interface • Integrated wireless sensors • very compact and lightweight design   • remote system management • easy installation Control Panel Wireless Alarm Kit DSC Wireless Ready Alarm System Kit

  10. Schematic/Theory of OperationCentral 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

  11. 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

  12. Schematic/Theory of OperationRemote sensor unit • Analog signals: smoke detector, microphone and temperature sensor

  13. Schematic/Theory of OperationRemote sensor unit • Digital signals: motion sensor, speaker, LEDs

  14. Schematic/Theory of OperationRemote sensor unit

  15. 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

  16. PCB areas XBee POWER AREA MICRO ANALOG AREA DIGITAL AREA

  17. 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

  18. 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

  19. Questions / Discussion

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