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Group 16: Efficient HVAC System

Group 16: Efficient HVAC System. 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. Motivation – Natural Air Energy. HVAC = Heating, Ventilation and Air Conditioning

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Group 16: Efficient HVAC System

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  1. Group 16: Efficient HVAC System 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

  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.

  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

  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

  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

  6. Project Block Diagram

  7. Software

  8. Software Areas

  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

  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 consumer’s changes from their specific entries within the database.

  11. Website Application - Tools • Control and monitor a user’s 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

  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

  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

  14. Main Page

  15. User Settings

  16. Seven Day Scheduler

  17. Administration

  18. Mobile Version

  19. MySQL Database

  20. User Activity Diagram

  21. Hardware

  22. Hardware Areas

  23. Hardware Simulator

  24. 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

  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 µA current drain (small power consumption) • ±0.8°C accuracy (normally)

  26. Temperature Sensor II This setting works ranging from +5˚ to +300˚F

  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 +50°C (in 5V)

  28. CHS-MSS Characteristic • Three pin –GND, Vin, Vout • Linear relationship (RH VS Output Voltage) • 1V  100 % RH • 0.8v  80% RH

  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

  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

  31. PCB Layout

  32. Roles in the Project

  33. Budget and Financing

  34. Questions? We will then begin a demonstration. http://www.naturalairenergy.com/hvac http://www.naturalairenergy.com/m/

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