Transcript Humidity-Activated Bathroom Fan

Humidity-Activated Bathroom Fan
Mid-Semester Presentation
Senior Design I
March 1, 2012
Team Members
Brittany Berryman
Aaron Plunkett
John Ayom
Team Manager, Power Circuit,
Wireless
Programming, Wireless,
Documents Lead, Website
Programming, Wireless,
Dontavius Morrissette
Dr. Mike Mazzola
Chris Fleming
Programming, Humidity
Sensor, Research
Team Advisor
Team Technical Leader,
Power Circuit and Relaying
Presentation Overview
• Problem
• Solution
• Constraints
– Technical
– Practical
• System Overview
• Approach
• Progress
• Timeline
• References
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
Approach
Switching Comparison
Switching Comparison
How It Works:
[2]
Switching Comparison
Protocol
Good
Bad
Relay
• Used for AC and
DC circuits
• Sparking
• Contacts wear
out easily [2]
Triac
• No operation noise
• No moving parts to
wear out
• No sparking
between contacts
• Only used for
AC circuits
Switching Comparison
Protocol
Good
Bad
Relay
• Used for AC and
DC circuits
• Sparking
• Contacts wear
out easily [2]
Triac
• No operation noise
• No moving parts to
wear out
• No sparking
between contacts
• Only used for
AC circuits
Triac
Part
Gate Voltage (V)
Price ($)
Q2004L3
1.3
.85
Q4008L4
2.25
2.26
Q4008R4
2.5
1.25
Q6015L5
2
1.95
[3]
Triac
Part
Gate Voltage (V)
Price ($)
Q2004L3
1.3
.85
Q4008L4
2.25
2.26
Q4008R4
2.5
1.25
Q6015L5
2
1.95
[3]
Humidity Sensor
Humidity Sensor
How It Works:
Capacitive:
•Consists of a substrate on which a thin film of polymer or
metal oxide is deposited between two conductive
electrodes
Resistive:
•Consists of metal electrodes deposited on a substrate
(silicon, glass, ceramic)
•Sensor absorbs water vapor and ionic functional groups
are dissociated
[4]
Humidity Sensor
Part
Accuracy (%) Response
Time (sec)
Output
HIH-5030
±3
5
Linear Voltage
HIH-4030
±3.5
5
Linear Voltage
HCH-1000-001
±2
15
Capacitance
[3]
Humidity Sensor
Part
Accuracy (%) Response
Time (s)
Output
HIH-5030
±3
5
Linear Voltage
HIH-4030
±3.5
5
Linear Voltage
HCH-1000-001
±2
15
Capacitance
[3]
Wireless
Wireless Communication
Protocol
PowerHow
Range (m)
It Works:
802.11
(Wifi)
High
50 to 100
3s to 5s
802.15.4
(Zigbee)
Low
10 to 100
30ms
802.15
(Bluetooth)
Medium
1 to 100
3s
Connection
Time
[5]
Wireless Communication
Protocol
PowerHow
Range (m)
It Works:
802.11
(Wifi)
High
50 to 100
3s to 5s
802.15.4
(Zigbee)
Low
10 to 100
30ms
802.15
(Bluetooth)
Medium
1 to 100
3s
Connection
Time
[5]
Wireless
Part
Power
Output
(mW)
Sleep Current Wake-Up
(µA)
Time
CC2530F32RHAT
(Texas Instruments)
10
2µA
XB24-AWI-001
(XBee)
1
RF300
(Synapse Wireless)
100
4µs
[3]
<50
2ms
[3]
<16
1.2ms
[6]
Wireless
Part
Power
Output
(mW)
Sleep Current Wake-Up
(µA)
Time
CC2530F32RHAT
(Texas Instruments)
10
2µA
XB24-AWI-001
(XBee)
1
RF300
(Synapse Wireless)
100
4µs
[3]
<50
2ms
[3]
<16
1.2ms
[6]
Progress and Timeline
Ceiling Module
1. Variable voltage is
sent to the
microcontroller
2. PIC receives
analog voltage and
sends value to
XBee
3. XBee sends
wireless data to the
control module
Wall Module
1. XBee receives data
from ceiling module
2. Microcontroller receives
value from XBee
Output Data
•Output from the control module
microcontroller
•Proves successful wireless
transmission of data from the ceiling
module to the control module
2/23/12
Example Code
2/23/12
Triac Circuit
The Triac circuit utilizes a
low DC voltage to turn
switch 120 V AC.
2/23/12
Power Circuit
Timeline
References
[1] In techMall, February 16, 2012. Retrieved from
http://biotechnological/Single-Gang-In-Wall-Junction-Box-S118-W-1G-p/30780.htm
[2] “How Dimmer Switches Work,” in howstuffworks, February 18,
2012. Retrieved from http://home.howstuffworks.com/dimmerswitch3.htm
[3] In Digikey, February 17, 2012. Retrieved from http://www.digikey.com
[4] “Resistance Change Type Humidity Sensor Units with High-Accuracy
Detection and Output Control,” in TDK, February 23, 2012. Retrieved from
TDK.co.jp/tfl_e/sensor_actuator/CHS/index.html
[5] “How does ZigBee compare with other wireless standards?” in Software
Technologies Group, February 24, 2012. Retrieved from
stg.com/wireless/ZigBee_comp.html
[6] “SNAP Components: Synapse RF Engines,” in Synapse, February 24,
2012. Retrieved from synapse-wireless.com/snap-components/rfengine#docs
Humidity-Activated Bathroom Fan
Mid-Semester Presentation
Senior Design I
March 1, 2012