Specifications

v
Figure 39 SHT21 Normal operating range .....................................................................82
Figure 40 SHT21 pin layout ...........................................................................................82
Figure 41 Start Conditions for I
2
C protocol ....................................................................83
Figure 42 Commands accepted by SHT21 ...................................................................83
Figure 43 SHT21 Default register settings .....................................................................84
Figure 44 The SLCD5 controller board ..........................................................................87
Figure 45 Connectors and Jumpers Layout of the SLCD5 .............................................89
Figure 46 SCLD5 Communication Setup .......................................................................89
Figure 47 - High - Level System Block Diagram ............................................................95
Figure 48 - Main Control Unit Interfacing .......................................................................96
Figure 49 - Outline of the User - Case Processes for the Main Control Unit ..................97
Figure 50 - Secondary Microcontroller Interfacing .........................................................98
Figure 51 - Typical Relay setup for HVAC Control Systems ..........................................99
Figure 52 Microstrip Layout on a PCB ......................................................................... 105
Figure 53 Capacitors Associated with LM2937-3.3 Voltage Regulator 107
Figure 54 24V AC to 3.3V DC conversion .................................................................... 108
Figure 55 An example of a weatherproof wall mount housing for small electronic devices
such as a remote sensing unit. .................................................................................... 112
Figure 56 High-Level Explorer 16 Development Board Block Diagram ....................... 114
Figure 57 MRF24J40MB PICtail™/ PICtail Plus Daughter Board................................. 115
Figure 58 MRF24J40MB PICtail™ Daughter Board plugged into Explorer 16
Development Board ..................................................................................................... 116
Figure 59 MRF24WB0MA Signal Interface .................................................................. 117
Table of Tables
Table 1 Coding Responsibilities Broken Down By Group Member .................................12
Table 2 Budget and Financing .......................................................................................17
Table 3 Pins to be connected at all times ......................................................................27
Table 4 Pins used for interfacing ...................................................................................28
Table 5 Touch screen technology comparison ...............................................................38
Table 6 Pros and Cons of ZigBee ..................................................................................42
Table 7 802.11 Network Standards ...............................................................................43
Table 8 Wireless protocols key features ........................................................................44
Table 9 Main and Secondary microcontroller wireless module requirements .................45
Table 10 Configuration used by Tic C ............................................................................49
Table 11 Configuration used by MPFS.C .......................................................................50
Table 12 Configuration used by StackTsk.c ...................................................................50
Table 13 Configuration used by TCP.c ..........................................................................51
Table 14 Configuration used by User Application ..........................................................51
Table 15 Configuration used by UDP.c ..........................................................................52
Table 16 Configuration used by MAC.c .........................................................................52
Table 17 Configuration used by ARP.c ..........................................................................52
Table 18 Configuration used by HTTP.c ........................................................................53
Table 19 Configuration used by FTP.c...........................................................................53
Table 20 Configuration used by DHCP.c .......................................................................53