mid-semester presentation senior design ii october 2, 2012 humidity-activated bathroom fan
DESCRIPTION
Problem Solution Constraints –Technical –Practical System Overview SD II Progress PCB’s Testing Enclosures Timeline References Questions/Comments Presentation OverviewTRANSCRIPT
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Mid-Semester PresentationSenior Design IIOctober 2, 2012
Humidity-Activated Bathroom Fan
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Dontavius MorrissetteComputer EngineerDr. Mike Mazzola
Team Advisor
John AyomElectrical Engineer
Brittany BerrymanElectrical Engineer
Chris FlemingElectrical Engineer
Aaron PlunkettElectrical EngineerComputer Engineer
Team Members
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Presentation Overview
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Problem and Solution
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Issues with high humidity in the bathroom:
•Uncomfortable environment
•Structural damage
•Mold
Problem
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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
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Technical and Practical Constraints
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Name DescriptionHumidity Resistance The wireless ceiling module must be
able to withstand up to 100% humidity.Activation Accuracy The HABF is activated when the
humidity reaches ±5% of the user set level.
Wireless Transmission The system must have wireless range of at least 30 feet.
Supply Power The control module must operate from 120VAC/60Hz.
Device Power The ceiling module is battery operated with an estimated battery life of no less than 1 year.
Technical Constraints
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Type Name DescriptionManufacturability
Size The HABF control module must fit within a single-gang electrical junction box.
Sustainability Maintenance The HABF system must require almost no user interaction or maintenance.
Practical Constraints
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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]
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Sustainability: Maintenance
The HABF must require limited user interaction relating to device maintenance.
Practical Constraints
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2/23/12
System Overview
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System Overview Control Module Ceiling Module
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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
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Control Device
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Schematic
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Printed Circuit Board
Wall Routed
AC/DC Converter
PIC24
XBEE
TRIAC
67mm
83mm
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Ceiling Device
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Schematic
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Printed Circuit Board
Ceiling Routed
Timer
XBEE
PIC24
Humidity SensorVREF
63mm
70mm
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Device Enclosures
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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]
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Testing
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TestingThe 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
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Tasks Left To Do:1. Finalize Code
2. Order PCB
3. Populate PCB
4. Test PCB
5. Design Ceiling Enclosure
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2/23/12
Senior Design II TimelineAugust Septemb
erOctober Novembe
rProjectRefinementPCBDesignPCB PopulatingControl ModuleEnclosureCeiling ModuleEnclosureTesting
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[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
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Mid-Semester PresentationSenior Design IIOctober 2, 2012
Humidity-Activated Bathroom Fan