Daniel Galarza, CpE Chung Chien Hsia, EE Kevin Ivy, EE Marvin
Fernandez, CpE Mentors: William Carson Sr. and William Carson Jr.
Sponsors: Workforce Central Florida
Slide 2
Motivation Natural Air Energy HVAC = Heating, Ventilation and
Air Conditioning Massive household energy consumption Different
needs for different climates Humidity almost never considered Make
improvements on the previous version of this project.
Slide 3
Project History iTemp First design Ineffective Software was
slow Did not have a hardware simulation for AC Unit Efficient HVAC
System Second design Expensive, and excessive components (Panda
Board) Mobile Application and Website never completed
Slide 4
Project Overview Web connectivity Website that can control an
HVAC system MySQL Database for storing user entries Mobile Phone
Application that mimics website Hardware simulator based on
redesign of HVAC system
Slide 5
Specifications MySQL Database stores user information Secure
login for users Secure login for advanced administrator functions
Website accessible by mobile and desktop browsers Hardware reads
temperatures & humidity CO2 Sensor Machine to Machine
Communication
Slide 6
Project Block Diagram
Slide 7
Slide 8
Software Areas
Slide 9
MySQL Database Stores HVAC system data Stores customer and
administrator credentials Temperature, Humidity, Tolerance control
Seven Day Scheduler Programming Basic User Settings stored Advanced
Administrator Settings stored
Slide 10
Website Application Allows a user to control their home HVAC
system from a web browser. Based on the format of previous screens.
Has all the same functions of the previous system. Obtains all of
the consumers changes from their specific entries within the
database.
Slide 11
Website Application - Tools Control and monitor a users HVAC
system from a desktop or mobile web browser. PHP For coding
database interaction SQL Direct communication with Database
jQuery/AJAX Dynamic, automatic updating Dreamweaver hand coding PHP
and SQL Gator Host www.naturalairenergy.com
Slide 12
Mobile Software Comparisons Android iOS (iPhone) SDK is free
Many different software programs available that supports Android
Primary language is Java SDK is $100 roughly Few other software
programs are compatible with it Primary language is
Objective-C
Slide 13
Mobile Website Solution jQuery Mobile provided a third option
Mobile Website similar to main website Accessible to a various
phones such as Android and iPhone No development fees Works on most
mobile browsers and formats Accessed using the /m website
address
Board Expansion PIC32 I/O 132-pin Starter Kit connector
Optional 9V DC Inlet with 3.3 and 5 volt regulators Two 2x30-pin
header footprints Two 120-pin PICtail Plus daugther card sockets
120-pin PICtail Plus edge connector
Slide 25
Temperature Sensor I LM34 (Precision Fahrenheit Temperature
Sensors) Linear +10.0 mV/F scale factor Operates from 5 to 30 volts
Less than 90 A current drain (small power consumption) 0.8C
accuracy (normally)
Slide 26
Temperature Sensor II This setting works ranging from +5 to
+300F
Slide 27
Humidity Sensor CHS-MSS (TDK) Compact size Low current
consumption. Debug the humidity directly with a voltmeter Measuring
range from 20 % to 85 % RH Nominal Accuracy is 5 % RH Operating
Condition : 0 to +50C (in 5V)
Slide 28
CHS-MSS Characteristic Three pin GND, Vin, Vout Linear
relationship (RH VS Output Voltage) 1V 100 % RH 0.8v 80% RH
Slide 29
CO2 Gas Sensor Parallax Inc 27929 Power requirements: 6.5 - 15
VDC @ 160 mA (Sense Mode) / 2 mA (Standby) Gas over-limit alarm
Price: $39.99 4 pin connection - E1 (Heat switch)0-12V -E3 Vin
(6.5-12V) - E2 (Alarm output)0-3.3V -E4 Gnd Noted :First time use
need to do the calibration
Slide 30
Analog to Digital Converter (ADC) Most controller is digital in
nature (PIC32 is same) Only recognize High and Low (0 or 1) Need
ADC to convert voltage reading to digital representation 10 bits
ADC in PIC 32 (from 0-3.3 V) 3.3 V/(2^10) = 3.22 mV (precision of
reading) PIC 32 has 2 multiplexer for ADC