Safety Monitoring Device and System (SMDS) Sponsor: NovaComm Security Systems, INC.

1. Safety Monitoring Device and System (SMDS)Sponsor: NovaComm Security Systems, INC. Senior Design II Summer 09 Group 7 Members: Alan Seims Andrew Farrell Frank Ogadah Tien Tran

2. Goals • Primary: Provide a user friendly monitoring system which can be used to detect fires and explosions in a commercial building • Purpose: • Reduce response time by rescue officials • Integrate into sponsors system: • Release emergency doors which have delays

3. System Requirements • Provide an area of coverage of 40’ x 40’ x 15’ • Detect incendiary events: • Room Temperature- Threshold set to 120˚F • Meet National Fire Protection Association(NFPA) standards “Low” under the category of heat detector. • Monitor room air for smoke • Detect explosions: • Room acoustic - Threshold set at 100dB(default) • Provide battery backup: 24 Hrs • GUI monitoring system for end user

4. Design Overview

5. Task Assignments • Controls – Frank Ogadah • User Interface – Tien Tran • Power Management - Alan Seims • Sensors - Andrew Farrell

6. Acoustic Sensor • Manufacturer : PCB Piezotronics • Model : 130D20 • Type: piezoelectric • Frequency response : 20Hz – 20kHz • pSPL(linear response) – 120dB • Cost: $420.00

7. Acoustic Circuit Schematic

8. Acoustic Circuit pSPL = 107.6dB

9. Thermal Sensor • National Semiconductor • Model: LM19 • Temperature range: -55˚C – 130˚C • Sensitivity: 11.9 mV/ ˚C • Tolerance: +/- 2.5˚C using a parabolic transfer function • Transfer Function: • Cost: $0.34

10. Thermal Circuit Schematic

11. Smoke Sensor • Model: 276-142 • Matched IR Emitter/PhotoTransistor • Emitter: • λpeak = 850nm • Phototransistor • Spectral Bandwidth = 620nm - 950nm • Peak Sensitivity = 850nm • Cost: $3.49

12. Smoke Sensor Circuit Schematic

13. Microcontroller Selection Process

14. Arduino Development • ATmega 328P Final Choice • 20 MIPS Throughput at 16 MHz • 6 Channel 10 Bit ADC PDIP (Input) • Programmable Serial USART • 13 Programmable Lines (I/O) • 6 Power Channels (PWM) • On chip analog comparator • Arduino IDE, C++ compatible

15. Communication(Sensors) Acoustic Sensor • Sensors send Analog Signals to Assigned pins • MCU will control Sensors via Digital Signals through Quad-High-Side-Switch • Sensors connected to LED to confirm activity • Communicate through FT232RL MCU ATMega328 Thermal Sensor Smoke Sensor

16. Communication(PC) CPU (GUI) • Receive communication from MCU • Transmit data via USB to Desktop • Have TX and RX LED to verify communication taking place (Optional) RS232 FT232RL USB CPU (GUI)

17. Schematic ATmega 328P

18. Schematic FT232RL

19. MCU Code Design • Used Arduino 0015 IDE • Program input and output pins • Program Function to collect & Display Analog Data • Control Function to Control Sensors

20. Software Development • GUI (Graphical User Interface), for easy user interaction • Language C# • Object Oriented programming • IDE – Microsoft Visual Studio 2008 • Provides very easy GUI creation tools and environments • Cost = Free from msdn

21. GUI Layout Start End • A class per form • Password Form start/ends program • System Log updates at for each event • Verifies user has correct access to use the system • Branches to Main Form if successful Password Form Verify Account Main Form

22. GUI Layout • Main form branches to 5 other forms • Monitor and Alert deals with microcontroller and outside contact • System Log is updated automatically at certain events • Admin rights determines ability to modify EContact and UserAccount data • New editing or adding new entry Alert Form Main Form System Log Form Monitor Form Admin Check Emergency Contact Form User Account Form Add/Edit Form Add/Edit Form

23. Database • 3 Text files for storing specific system information • UserAccount.txt – Holds user account info • EContacts.txt – Hold emergency contact information • SystemLog.txt – Holds log data for specific events occurring during operation

24. Data Type

25. Data Size Consumption • UserAccount.txt – 174 bytes/Entry • 20 X 174 = 3480 bytes or 3.4 kilobytes • EContacts.txt - 134 bytes/Entry • 20 X 134 = 2680 bytes or 2.62 kilobytes • SystemLog.txt – 115 bytes/Entry • (4-logs X 2-instances X 365-days) X 115 bytes = 335800 bytes or 327.9 KB or .32 MB • Cheapest and smallest HD 160 GB for $30 Newegg

26. Alert Design • Alert Form • Sends important messages to selected individuals • Message is dictated by user • Update log • Uses data from EContact.txt • Two forms of alert: • Email • Text messaging

27. Alert Design Start • Execution tier: • Email • Text message • Cycle through each contact entry and checks priority and executes based on priority • Priority levels: 1 - 3 Match Priority Next Entry Send Email Check if Texting Send Text Message

28. Alert Design • Use smtp mail server to send out email and text message • Requires an account with username and password • Demonstration: Smtp from Google using GMAIL • smtp.gmail.com, port 587

29. Alert Design • Email • Subject, Message, Email Address • Text Messaging • Subject, Message, Cell Phone Number • Gateway • AT&T Wireless: number@txt.att.net • T-Mobile: phonenumber@tmomail.net • Verizon: phonenumber@vtext.com

30. Device Monitor Design • Monitor Form class • Connects to detection device, serial • Turn off individual sensors or resets them all • Monitors signals transferred from device • Shows message when sensors are tripped with visual representation • Call alert from this form

31. Power Management and Distribution System • The device requires a continuous supply of at least 24 VDC. • The system has two power sources: main power supply and battery backup. • Battery Backup provides 24-Hr run time • Power to each sensor is controlled by the Central Monitoring System.

32. Main Power Source: LS35-36 • Switch-mode power supply • 50 kHz switching frequency • 88-264 VAC/47-63 Hz input • Provides 36 VDC at 1 A • Small size (3.9” x 3.2” x 1.4”) • Cost: $19.03

33. Battery Backup Source • Ensures uninterrupted power to the device for 24-Hrs. • Two PS-1221S 12 V SLA batteries in series. • 2 Ah capacity • 5.75” x 3.5” x .75” • 1.5 lb ea. • Cost: $22.95 ea.

34. Battery Charging System: UC3906 • Designed specifically for Sealed Lead Acid Batteries • Programmable charge current • Used as a three level float charger • 16 pin DIP IC ( .785”x.3” ) • Input voltage range: 6-40 V • Cost: $5.50

35. UC3906 Application

36. Sensor Power Control: LT1161 • Solid state switch compared to electro-mechanical relay. • 20 lead plastic DIP • Enables the Central Monitoring System to control sensor power. • Input voltage: 8-48 V • Fully enhances N-channel MOSFET switches • Individual short circuit protection for the sensors • Cost: Free

37. Voltage Regulators: LM317M • Adjustable voltage through the use of an external voltage divider circuit • Output voltage: 1.2-37 V • Output current: .5 A • Cost: $.69 ea.

38. PCB Layout

39. Power Consumption

40. Housing

41. Physical Testing • System Testing: • Acoustic: Cap gun to generate a sound pressure wave greater than 100dB • Thermal Detector: use a heat gun • Smoke: Use a fire detector test spray which met • NFPA standard 72 • UL Standards 217 and 268 • Battery Backup: disconnect main power and test. • Software testing: • Proper alerts were executed

42. Bill of Materials

43. Questions/Answers