Microchip Technology Humidity Sensor PICtail Dokumentacja Strona 93
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TFT-LCD panel, and the SLCD5 controller (SLCD5 controller will be discussed in
detail in a later section). To activate the LCD touch screen we can either use the
user‟s finger or a pen to input various states for our HVAC control system. On
the home screen of the LCD panel the user will be able to, among other things,
set the desired temperature and relative humidity for when the system is in
cooling mode, set the temperature and relative humidity for when the system is in
heating mode, view the current temperature and relative humidity inside the
building, view the current temperature and relative humidity outside the building,
and choose between several settings that range from maximum savings to
maximum comfort (specifies to the system the tolerance for temperature and
relative humidity variation from set points). The model number of the Evervision
screen we have chosen is VGG804805-6UFLWE. Each letter and number is a
descriptor of a part of the panel. The descriptors that are important to our
implementation of the design are outlined in Table 25.
LCD Type
LCD Model
Backlight Type
Backlight
Color
U: Transmissive/Positive
F: TFT
L: General LED
W: White
Table 25 Important descriptors of the Evervision 7” LCD panel from the
model number (Reprinting Permission Granted from Evervision)
The physical specifications of the LCD panel are what must meet the basic
requirements presented to us by the sponsors. Originally the sponsors informed
us they wanted something in the 7 to 8 inch range that was touch sensitive that
would be aesthetically pleasing (bright, colorful display). Again, since this is the
only portion of the system that a potential customer would interact with, the LCD
panel must be very attractive. The physical specifications for the Evervision 7”
LCD are shown in Table 26 below.
Item
Specifications
Unit
Size of Screen
7
inches
Active Area
152.4(H) x 91.44 (V)
millimeters
Dot Size
0.0635(H) x 0.1905(V)
millimeters
Pixel Configuration
RGB Vertical Stripe
-
Weight
215
grams
Display Mode
Transmissive Mode
Normally White TN Type
-
Display Format
800RGB(H)x480(V)
Dot
Surface Treatment
Anti-Glare and Hard Coating
(3H)
-
Outline Dimension
166.6(W)x107.0(H)x11.5(D)
millimeters
Viewing Direction
6 O‟clock
-
Table 26 Specifications for 7 inch Evervision LCD Panel
- Table of Contents 3
- Table of Figures 6
- Table of Tables 7
- 1.1 Executive Summary 9
- 1.2 Motivation 10
- 1.3 Objective 12
- 1.3.1 Remote Sensing Unit 12
- 1.3.2 Main Control Unit 13
- 1.4.2 Detailed Requirements 14
- 1.5.1 Division of Labor 16
- 1.5.2 Coding Breakdown 18
- 1.6 Block Diagrams 20
- 1.7 Timelines and Milestones 21
- 1.8 Budget / Finances 24
- Section 2: Research 26
- 2.1 Research Methods 26
- 2.2 Main Microcontroller 27
- Input / Output Ports: 28
- Memory Type: 29
- Development tools: 29
- Instructions 30
- 2.2.1 General Description 31
- 2.2.2 Pins 34
- 2.2.3 Interfacing 36
- 2.5 LCD Touch Screen 43
- 2.6 Wireless Interfacing 47
- 2.6.2 Wireless Protocols 48
- 2.6.3 IEEE 802.15.4 – ZigBee 49
- 2.6.4 Bluetooth 50
- 2.6.5 IEEE 802.11 – Wi-Fi 51
- 2.7 Smart Phone Application 53
- 2.7.1 Remote Access 53
- 2.7.2 TCP/IP 54
- 2.7.3 Host-to-Network Layer 54
- 2.7.4 Internet Layer 55
- 2.7.5 Transport Layer 55
- 2.7.6 Application Layer 56
- 2.7.7 Microchip TCP/IP Stack 56
- 2.7.8 Implementation 57
- 2.7.9 Microchip HTTP Server 63
- 2.7.10 Implementation 63
- 2.8 MPFS 66
- 2.9 Mobile Web Site 68
- 2.10 iPhone App 68
- 2.12 Power 70
- User Interface 70
- 2.12.2 Remote Sensing Unit 70
- 2.13 Batteries 71
- 2.15 Dampers 73
- Approx. 4' 74
- 18" 75
- 12" 75
- 24" 75
- 2.16 Sensors 76
- 3.5" 77
- 82
- Wireless Sensor 83
- (MRF24WB0MA) 86
- Sensor 89
- 3.3.1 Sensirion SHT21 89
- C Protocol 90
- 3.5 SLCD5 Controller 95
- Processor 97
- 3.5.2 Touch Interface 98
- Program 98
- Description 99
- Command 99
- Arguments 99
- 3.6 Design Summary 102
- Main Control Unit 103
- Main Control System 105
- Secondary 106
- Microcontroller 106
- 4.1.2 Microchip 108
- Section 4: Prototype 108
- 4.1 Vendors 108
- 4.1.1 Reach Technology Inc 108
- 4.1.3 Sensirion 109
- 4.2 Printed Circuit Board 109
- 4.4 Remote Sensing Unit 116
- 4.5 Relays 117
- 4.6 Demonstration 119
- Section 5: Testing 121
- Daughter Board 123
- 5.4 Safety Considerations 125
- 5.5 Equipment 126
- 5.6 Environment 127
- 5.7.1 Final Specifications 127
- 5.7.2 Final Requirements 128
- Bibliography 135
- *Subject of your message: 140
- *Message: 141
- Reach Technology Permission: 143
- Microchip Permssion: 144
- Contact Us 145
- Thanks very much 146
- 727-580-6767 147
- Abbreviations and Acronyms 149
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