Smoke Notification System (SNS) Final Presentation Senior Design 1 April 18, 2013

Team Members Genetrice Stevenson Electrical Engineering George Wonsley Team Leader Electrical Engineering Richard Matson Electrical Engineering Dr. Raymond Winton Team Advisor Website Hardware Design Wireless Communication PIC Programming Hardware Design Technical Documentation Debugging Technical Documentation Wireless Communication

Problem Solution Constraints Technical Practical Testing Subsystems Overall System Prototype Future Tasks Questions

Problem and Solution

Problem Not every individual has the ability to effectively hear the standard smoke detector signal of 3100 Hz or higher. Individuals with hearing disabilities are the target market group for the SNS.

Current Market Current solutions are either too expensive or do not come equipped with all suitable notifications. [1] [2] Gentex Corporation Models available with audible/visual alerts Price Range: $150-$160 Silent Call Models available in pairs: audible/vibration or audible/visual Price Range: $127-$310

Solution The SNS aims to address the present limitations of smoke detection systems. Two device system: central unit and alert unit. Designed to work with existing smoke detectors. Incorporates vibration and visual alerts within one product.

Technical and Practical Constraints

Technical

System Overview Power Supply Existing Smoke Detector Microphone Wireless Transmitter Microcontroller Power Supply Wireless Receiver MotorStrobe Light Central UnitAlert Unit

Practical Dimensions of the central unit will not exceed 5” x 5” x 3”. Takes up the least amount of space possible Ensures all components fit properly inside the package Alert units will be slightly larger than the standard night- light. Manufacturability : Product Size

Practical The SNS must be user friendly and easy to operate. No training or extensive labor to install No maintenance (ex: battery changes) Simply plug both units into wall outlet Usability : Customer Convenience

Testing Subsystems & Overall System

Microphone Microphone with Smoke Alarm Signal

Filter Low Pass Filter with 3.1 kHz Applied

Filter Frequency sweep of filter from 6 kHz – 3 kHz.

Comparator Output of comparator with smoke alarm signal.

Comparator Measurement of pulse width.

Transmission

Transmission Range (feet) Percent Connectivity (%)

Alert Unit 75 feet from central unit2 feet from central unit

Alert Unit Alert Unit off Alert Unit on

Prototype

Prototype Central Unit

Prototype ADMP401 Microphone

Prototype Central Unit Buffer

Prototype Central Unit Sallen-Key Filter

Prototype Central Unit Voltage comparator

Prototype Central Unit PIC24HJ32GP202

Prototype Central Unit Xbee transmitter module

Prototype Alert Unit

Prototype Xbee receiver module

Prototype Alert Unit PIC24HJ32GP202

Prototype Alert Unit Strobe light LED

Prototype Alert Unit Motor for vibrating device

Future Tasks and Timeline

Future Tasks Software refinement Redesign filter PCB design Enclosure Testing

Timeline AugustSeptemberOctoberNovember Software Refinement PCB Design PCB Populating Enclosure Testing

References [1] (2013, February 13). “Audible/Visual Signaling Appliances,” in Fire Protection Products [Online]. Available: [2] (2013, February 13). “Smoke, Fire, & CO Detection,” in Silent Call Communications [Online]. Available: d94d6d d94d6d2165

Smoke Notification System (SNS) Questions?