ECE 477 Design Review Group 2  Spring 2005

Outline Project overviewProject overview Project-specific success criteriaProject-specific success criteria Block diagramBlock diagram Component selection rationaleComponent selection rationale Packaging designPackaging design Schematic and theory of operationSchematic and theory of operation Preliminary PCB layoutPreliminary PCB layout Software design/development statusSoftware design/development status Project completion timelineProject completion timeline Questions / discussionQuestions / discussion

Project Overview Home security/monitoring systemHome security/monitoring system Highly flexible and expandable systemHighly flexible and expandable system –swappable cards/expansion slots –I 2 C protocol Real time monitoring and alertsReal time monitoring and alerts –Status –Monitoring –Alerts

Project-Specific Success Criteria Ability to use a keypad to arm/disarm the system.Ability to use a keypad to arm/disarm the system. Ability to detect smoke, window breaks, doors opening, etc.Ability to detect smoke, window breaks, doors opening, etc. Ability to send calls as alerts if sensors are trippedAbility to send calls as alerts if sensors are tripped Ability for real time monitoring of system via InternetAbility for real time monitoring of system via Internet Ability to swap out the expansion modules.Ability to swap out the expansion modules.

Block Diagram

Component Selection Rationale Main MicrocontrollerMain Microcontroller Rabbit RCM3700Rabbit RCM3700 –External chip Ethernet –Confusing data sheets –Prior knowledge that Dynamic C is problematic Freescale 68H9S12NE64Freescale 68H9S12NE64 –Built in Ethernet hardware –i2c built in –Plenty of application guides and datasheets –All ANSI c coding –Excellent IDE for programming

Component Selection Rationale Module boardsModule boards Atmel ATMega88Atmel ATMega88 –Nice IDE –Cheaper microchip PIC18F2331microchip PIC18F2331 –Excellent application guides BothBoth –i2c built in –Plenty of flash and I/O –3.3v I/O

Component Selection Rationale Sensor SelectionSensor Selection –Many required 120vac –Many had proprietary interfacing GE Sensors (motion, shatter, intrusion)GE Sensors (motion, shatter, intrusion) –12v power supply –use standard relays, easy interfacing American Sensors (smoke)American Sensors (smoke) –120vac main power –Standard low voltage relay

Component Selection Rationale Power SupplyPower Supply Required VoltagesRequired Voltages –3.3v, 5v, 12v Required CurrentRequired Current –25ma/sensor, 56 max sensors –110ma/horn, 4 max horns 12v –285ma max, 3.3v –12ma/Atmel, 8 3.3v –20ma/sensor, 56 sensors max 3.3v Omron s82rOmron s82r –5v/12v 2A/2A

Packaging Design 1'x1'x6” 14 gauge steel box1'x1'x6” 14 gauge steel box Hinged and lockedHinged and locked Wall mountable, recessed designWall mountable, recessed design 20 in 2 for routing cables20 in 2 for routing cables External keypad mountExternal keypad mount

Schematic/Theory of Operation

Preliminary PCB Layout

Software Design/Development Status HTTP serverHTTP server –Theory –Status Current battle – Java AppletsCurrent battle – Java Applets Monitoring softwareMonitoring software –Theory I 2 C communicationI 2 C communication –Theory Child monitoring/keypad softwareChild monitoring/keypad software –Theory

Project Completion Timeline Mon Mar 7 – Submit case design for fabrication at the EE metal shopMon Mar 7 – Submit case design for fabrication at the EE metal shop Thurs Mar 10 – Board Layout dueThurs Mar 10 – Board Layout due Mon Apr 4 - All software in working condition on bread boardsMon Apr 4 - All software in working condition on bread boards Mon Apr 11 – Finish board assembly, begin testingMon Apr 11 – Finish board assembly, begin testing Mon Apr 18 – Finish testing, install in caseMon Apr 18 – Finish testing, install in case Sun Apr 24 – Complete video demoSun Apr 24 – Complete video demo

Questions / Discussion