Hvac control and Feedback System 0 Group 2 Steve Jones Mathew Arcuri Elroy Ashtian, Jr

1 Introduction 4

1.1 Executive Summary 4

1.2 Motivation 5

1.3 Objective 6

1.3.1 The Remote Sensing Unit 7

1.3.2 PIC Microcontroller 7

1.3.3 LCD Display and ARM processor 8

1.4 Specifications 8

1.4.1 Detailed Design Features 9

1.5.1 Coding 13

1.5.2 Milestones 14

1.5.2.1 Senior Design I 15

1.5.2.2 Senior Design II 16

1.6 Budget 16

2 Research 17

2.1 Research Methods 17

2.2 High Level Control Unit 19

2.2.1 ARM Microprocessor Based Master Main Controller 20

2.2.1.1 Processor Compatibility with Slave and other components 22

2.2.1.2 Constraints on size of Microcontroller 22

2.2.1.3 Analog to Digital Conversion and Input/Output ports 22

2.2.1.4 Communication Protocols / Integrated Peripherals 23

2.2.1.5 Memory Type 23

2.2.1.6 Cost 24

2.2.1.7 Voltage and current requirements 24

2.2.2.2 Linksprite 26

2.3 Microcontroller as Slave 32

2.3.1 PIC 32

2.3.1.1 Microcontroller Compatibility with other Components 33

2.3.1.2 Analog to digital and digital to analog converters I/O 33

2.3.1.3 Memory Type 34

2.3.1.4 Development tools 34

2.3.1.5 Overall architecture of system and Cost 35

2.3.1.6 Voltage and current requirements 35

2.3.2 ATMEL 40

2.3.2 Serial Connections 41

2.3.2.1 UART 42

2.3.2.2 I2C 43

2.3.2.3 SPI 45

2.4 Secondary Microcontroller/ Remote Sensor: 46

2.4.1 General Description 46

2.4.1.1 Operating Range 46

2.4.1.2 CPU Characteristics 47

2.4.1.3 I/O Characteristics 48

2.4.1.4 Three Serial Communication Peripheral 48

2.4.1.5 Cost of the original unit 48

2.4.2 Xbee vs Zigbee Wireless 50

2.4.3 Wired Connection 50

2.5 Wireless and Internet Connectivity 51

2.5.1 Overview – Wireless and Internet Connectivity 51

2.5.2 TCP/IP 52

2.5.3 Operating System - Wireless and Device Driver Implementation Maturity 53

2.5.4 Server 55

2.5.5 Web Application 56

2.5.6 Client Side Application 58

2.5.7 RSS Weather Feeds 58

2.6 Power System 60

2.6.1 Main Unit 60

2.6.1.1 Rectifier 61

2.6.1.2 Distribution 61

2.6.1.3 Vent Servos and Mood Scents 62

2.6.2 LCD Screen 62

2.6.3 Remote Sensor Unit 62

2.6.4 Dampers 63

2.7 Sensors 64

2.7.1 Temperature/Humidity 65

2.7.2 CO2 Sensor Applications 65

2.7.2.1 Senseair® CO2 EngineTM K22-OC 67

2.7.2.2 Senseair® CO2 EngineTM K30 70

2.7.2.3 Senseair® CO2 EngineTM K-33 ELG/BLG 71

2.7.2.4 Cost 72

2.8 Seer Ratings 72

3 Design 74

3.1 Software Design 74

3.1.2 Embedded Software 79

3.1.2.1 Components and Functionality 81

3.1.2.2 Microchip and ARM 82

3.1.2.3 ARM Processors 83

3.1.2.4 Microchip PIC microcontroller 84

3.2 Wireless 87

3.2.1 RF communication with Secondary unit. 87

3.3 Sensors 87

3.3.1 Temperature/Humidity 87

3.4 LCD Screen 97

3.4.1 Environmental Conditions for Xenarc LCD Monitor 98

3.4.2 Electrical Characteristics 98

3.5.1 Electrical Characteristics 100

3.5.2 Wi-Fi Dongle Design 101

3.7 Power System 101

3.7.1 Main Unit 102

3.7.2 Secondary Unit 103

3.7 Relays 104

4 Prototype 107

4.1 Vendors 107

4.1.1 Xenarc Technologies Corporation 107

4.1.2 Microchip 108

4.1.3 Sensirion 108

4.1.4 DigiKey 108

4.1.5 Senseair 109

4.1.6 CO2Sensors.com 109

4.2 Schematics 109

4.2.1 Main Master Control Unit 109

4.2.2. Secondary Unit Schematics 111

4.3 Main Control Unit 111

4.4 Remote Sensing Unit 114

4.5 Relays 115

4.6.1 High Level Control Unit and Main Control Unit 116

4.6.2 Remote Sensing Unit 117

5 Testing 118

5.1 Explorer 16 Development Board 119

5.1.1 Communicating with ARM 121

5.2 Safety Considerations 121

5.3 Equipment 121

5.4 Environment 123

5.5 Relays Testing 124

5.6 Relays Testing 124

5.7 Final Specifications and Requirements 124

5.7.1 Final Specifications 125

5.7.2 Final Requirements 126

6 Administrative 128

6.1 Milestones discussion 128

6.2 Budget Discussions 129

Table of Figures

Table of Tables

Directory: seniordesign -> sp2011su2011
sp2011su2011 -> Group 5 Spr-Sum 2011
seniordesign -> Senior Design II paper
seniordesign -> Remote Touchscreen-Controlled Defense Turret Senior Design Documentation Courtney Mann, Brad Clymer, Szu-yu Huang Group 11
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seniordesign -> Ehvac: Wireless Modular Multi-Zone hvac controller Group b javier Arias Ryan Kastovich Genaro Moore Michael Trampler
seniordesign -> Table of Contents Executive Summary 2