Final Presentation Senior Design I April 19, 2012 Humidity-Activated Bathroom Fan

Dontavius Morrissette Computer Engineering Dr. Mike Mazzola Team Advisor Chris Fleming Electrical Engineer Brittany Berryman Electrical Engineer Aaron Plunkett Electrical Engineer Computer Engineer John Ayom Electrical Engineer Team Members

Problem Solution Constraints –Technical –Practical System Overview Physical View Circuit Construction Testing Senior Design II Questions/Comments Presentation Overview

Problem and Solution

Issues with high humidity in the bathroom: Uncomfortable environment Structural damage Mold Problem

Humidity-Activated Bathroom Fan Two device system: wall (control) and ceiling module Calibrates and sets initial humidity settings for room After humidity exceeds 15% of initial calibration, the fan will turn on When room returns to the calibrated level, the fan will turn off Pushbutton will allow for user override Solution

Technical and Practical Constraints

NameDescription Humidity ResistanceThe wireless ceiling module must be able to withstand up to 100% humidity. Activation AccuracyThe HABF is activated when the humidity reaches ±5% of the user set level. Wireless TransmissionThe system must have wireless range of at least 30 feet. Supply PowerThe control module must operate from 120VAC/60Hz. Device PowerThe ceiling module is battery operated with an estimated battery life of no less than 1 year. Technical Constraints

TypeNameDescription ManufacturabilitySizeThe HABF control module must fit within a single- gang electrical junction box. SustainabilityMaintenanceThe HABF system must require almost no user interaction or maintenance. Practical Constraints

Manufacturability: Size The HABF control module must not exceed 2-1/4"(W) x 3- 3/4"(L) x 3-1/4"(D). This will allow the HABF to: Fit in to a typical single gang junction box Replace existing fan switch Practical Constraints [1]

Sustainability: Maintenance The HABF must require limited user interaction relating to device maintenance. Practical Constraints

2/23/12 System Overview

Control Module Ceiling Module

2/23/12 Circuit Construction

Control Module Manual Override Pushbutton Microprocessor Xbee Transceiver Heartbeat LED

External Circuits Switching Circuit Power Control Circuit

Ceiling Module Battery External Timer Circuit Humidity Sensor Microprocessor PIC24FJ16GA002 XBee Transceiver Sleep Indicator LED

Physical View

2/23/12 Testing

Wireless Transmission Wireless Range of 35ft

Humidity Sensor Activation

Humidity vs. Output Voltage

[2]

HABF Test Setup

2/23/12 Senior Design II

2/23/12 Future Tasks PCB Design Wall Module Enclosure Control Module User Interface Low-Battery Indicator User Variability Low-Current Part Replacements

2/23/12 Senior Design II Timeline AugustSeptemberOctoberNovember PCB Design PCB Populating Testing Wall Module Enclosure Ceiling Module Enclosure

[1] In techMall, February 16, Retrieved from Wall-Junction-Box-S1-18-W-1G-p/30780.htm [2] Honeywell. “HIH-5030/5031 Series Low Voltage Humidity Sensors”, in Digi-Key. Retrieved from References

Final Presentation Senior Design I April 19, 2012 Humidity-Activated Bathroom Fan