1. Mid-Semester Presentation Senior Design II October 2, 2012 Humidity-Activated Bathroom Fan

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

3. Problem Solution Constraints –Technical –Practical System Overview SD II Progress PCB’s Testing Enclosures Timeline References Questions/Comments Presentation Overview

4. Problem and Solution

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

6. 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

7. Technical and Practical Constraints

8. 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

9. 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

10. 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]

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

12. 2/23/12 System Overview

13. Control Module Ceiling Module

14. 2/23/12 Refinements and Progress Extended Battery Life Configure pins for low power Minimize a wait-time Eliminate parts Add Low Battery Indicator Reduced Part Sizes Completed PCB Design

15. Control Device

16. Schematic

17. Printed Circuit Board Wall Routed AC/DC Converter PIC24 XBEE TRIAC 67mm 83mm

18. Ceiling Device

19. Schematic

20. Printed Circuit Board Ceiling Routed Timer XBEE PIC24 Humidity Sensor VREF 63mm 70mm

21. Device Enclosures

22. Control Module The PCB for the Control Module is sized to fit inside a single gang junction box. The module is a drop in replacement for the factory fan switch. Ceiling Module A small enclosure will be constructed to house the Ceiling Module PCB and batteries. [1]

23. Testing

24. The following tests will be performed on both devices following the population of both printed circuit boards: Control Module Power Supply Measurements Ceiling Module Current Draw Measurements Final Product

25. Tasks Left To Do: 1.Finalize Code 2.Order PCB 3.Populate PCB 4.Test PCB 5.Design Ceiling Enclosure

26. 2/23/12 Senior Design II Timeline AugustSeptemberOctoberNovember Project Refinement PCB Design PCB Populating Control Module Enclosure Ceiling Module Enclosure Testing

27. [1] In techMall, February 16, 2012. Retrieved from http://biotechnological/Single-Gang-In-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 http://www.digikey.com/ References

28. Mid-Semester Presentation Senior Design II October 2, 2012 Humidity-Activated Bathroom Fan