Mid-Semester Presentation Senior Design I March 1, 2012 Humidity-Activated Bathroom Fan

Dontavius Morrissette Programming, Humidity Sensor, Research Dr. Mike Mazzola Team Advisor Chris Fleming Team Technical Leader, Power Circuit and Relaying Brittany Berryman Team Manager, Power Circuit, Wireless Aaron Plunkett Programming, Wireless, Documents Lead, Website John Ayom Programming, Wireless, Team Members

Problem Solution Constraints –Technical –Practical System Overview Approach Progress Timeline References 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 System Overview

Approach

Switching Comparison

How It Works: [2]

Switching Comparison ProtocolGoodBad RelayUsed for AC and DC circuits Sparking Contacts wear out easily TriacNo operation noise No moving parts to wear out No sparking between contacts Only used for AC circuits [2]

Switching Comparison ProtocolGoodBad RelayUsed for AC and DC circuits Sparking Contacts wear out easily TriacNo operation noise No moving parts to wear out No sparking between contacts Only used for AC circuits [2]

Triac PartGate Voltage (V)Price ($) Q2004L Q4008L Q4008R Q6015L [3]

Triac PartGate Voltage (V)Price ($) Q2004L Q4008L Q4008R Q6015L [3]

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]

PartAccuracy (%)Response Time (sec) Output HIH-5030±3±35Linear Voltage HIH-4030±3.55Linear Voltage HCH ±2±215Capacitance Humidity Sensor [3]

PartAccuracy (%)Response Time (s) Output HIH-5030±3±35Linear Voltage HIH-4030±3.55Linear Voltage HCH ±2±215Capacitance Humidity Sensor [3]

Wireless

Wireless Communication How It Works: ProtocolPowerRange (m)Connection Time (Wifi) High50 to 1003s to 5s (Zigbee) Low10 to 10030ms (Bluetooth) Medium1 to 1003s [5]

Wireless Communication How It Works: ProtocolPowerRange (m)Connection Time (Wifi) High50 to 1003s to 5s (Zigbee) Low10 to 10030ms (Bluetooth) Medium1 to 1003s [5]

Wireless PartPower Output (mW) Sleep Current (µA) Wake-Up Time CC2530F32RHAT (Texas Instruments) 102µA4µs XB24-AWI-001 (XBee) 1<502ms RF300 (Synapse Wireless) 100<161.2ms [6] [3]

Wireless PartPower Output (mW) Sleep Current (µA) Wake-Up Time CC2530F32RHAT (Texas Instruments) 102µA4µs XB24-AWI-001 (XBee) 1<502ms RF300 (Synapse Wireless) 100<161.2ms [6] [3]

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 2/23/12 Output from the control module microcontroller Proves successful wireless transmission of data from the ceiling module to the control module

Example Code 2/23/12

Triac Circuit 2/23/12 The Triac circuit utilizes a low DC voltage to turn switch 120 V AC.

Power Circuit

Timeline

[1] In techMall, February 16, Retrieved from 1G-p/30780.htm [2] “How Dimmer Switches Work,” in howstuffworks, February 18, Retrieved from switch3.htm [3] In Digikey, February 17, Retrieved from [4] “Resistance Change Type Humidity Sensor Units with High-Accuracy Detection and Output Control,” in TDK, February 23, 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, Retrieved from stg.com/wireless/ZigBee_comp.html [6] “SNAP Components: Synapse RF Engines,” in Synapse, February 24, Retrieved from synapse-wireless.com/snap-components/rf- engine#docs References

Mid-Semester Presentation Senior Design I March 1, 2012 Humidity-Activated Bathroom Fan