Transcript Humidity-Activated Bathroom Fan

Humidity-Activated Bathroom Fan
Mid-Semester Presentation
Senior Design II
October 2, 2012
Team Members
Brittany Berryman
Aaron Plunkett
Chris Fleming
Electrical Engineer
Electrical Engineer
Computer Engineer
Electrical Engineer
John Ayom
Electrical Engineer
Dr. Mike Mazzola
Team Advisor
Dontavius Morrissette
Computer Engineer
Presentation Overview
• Problem
• Testing
• Solution
• Enclosures
• Constraints
• Timeline
– Technical
• References
– Practical
• Questions/Comments
• System Overview
• SD II Progress
• PCB’s
Problem and Solution
Problem
Issues with high humidity in the bathroom:
•Uncomfortable environment
•Structural damage
•Mold
Solution
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
Technical and Practical
Constraints
Technical Constraints
Name
Description
Humidity 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.
Practical Constraints
Type
Name
Description
Manufacturability
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
Manufacturability: Size
The HABF control module must not exceed 2-1/4"(W) x 33/4"(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
[1]
Practical Constraints
Sustainability: Maintenance
The HABF must require limited user interaction
relating to device maintenance.
System Overview
2/23/12
System Overview
Control Module
Ceiling Module
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
2/23/12
Control Device
Schematic
Printed Circuit Board
AC/DC
Converter
TRIAC
83mm
XBEE
PIC24
67mm
Wall Routed
Ceiling Device
Schematic
Printed Circuit Board
XBEE
PIC24
Timer
63mm
Humidity
Sensor
VREF
70mm
Ceiling Routed
Device Enclosures
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.
[1]
Ceiling Module
• A small enclosure will be constructed to house
the Ceiling Module PCB and batteries.
Testing
Testing
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
Tasks Left To Do:
1. Finalize Code
2. Order PCB
3. Populate PCB
4. Test PCB
5. Design Ceiling Enclosure
Senior Design II Timeline
August
September
October
November
Project
Refinement
PCB
Design
PCB
Populating
Control Module
Enclosure
Ceiling Module
Enclosure
Testing
2/23/12
References
[1] In techMall, February 16, 2012. Retrieved from
http://biotechnological/Single-Gang-In-Wall-Junction-BoxS1-18W-1G-p/30780.htm
[2] Honeywell. “HIH-5030/5031 Series Low Voltage Humidity Sensors”,
in Digi-Key. Retrieved from http://www.digikey.com/
Humidity-Activated Bathroom Fan
Mid-Semester Presentation
Senior Design II
October 2, 2012