Specifications

iv
Table of Figures
Figure 1 Residential Energy Use .................................................................................... 3
Figure 2 Roles and Responsibilities ..............................................................................10
Figure 3 High level system block diagram .....................................................................13
Figure 4 Milestone Timeline ...........................................................................................15
Figure 5 Meeting Timeline .............................................................................................16
Figure 6 Harvard architecture ........................................................................................22
Figure 7 Required Minimum Connections ......................................................................27
Figure 8 Main Control Unit interfacing............................................................................29
Figure 9 Secondary Microcontroller Interfacing ..............................................................32
Figure 10 Typical HVAC relay setup ..............................................................................34
Figure 11 Resistive touch screen .................................................................................35
Figure 12 Surface Acoustic Wave touch screen ...........................................................36
Figure 13 Capacitive touch screen ................................................................................37
Figure 14 Layers of the TCP/IP reference model ...........................................................46
Figure 15 Comparing the Microchip TCP/IP stack structure to the TCP/IP reference
model ............................................................................................................................48
Figure 16 Mandatory programming sentences ...............................................................54
Figure 17 Uploading an MPFS Image using FTP ...........................................................56
Figure 18 CGI Page Calling the HTTPGetVar Function .................................................57
Figure 19 Dynamically Updated Web Page using HTML code .......................................57
Figure 20 HTTPGetVar Function ...................................................................................58
Figure 21 MPFS Image Format .....................................................................................59
Figure 22 MPFS Fat Entry Format .................................................................................59
Figure 23 MPFS Data Block Format ..............................................................................60
Figure 24 Air duct with damper motor assembly ............................................................66
Figure 25 Manual balancing damper .............................................................................67
Figure 26 Volume control damper ..................................................................................67
Figure 27 Thermocouple Sensor ...................................................................................69
Figure 28 Bead type thermistor .....................................................................................70
Figure 29 Resistive Humidity sensor graph with Resistance vs. Relative Humidity
variables ........................................................................................................................71
Figure 30 Output Signal in mV vs. Absolute Humidity in g/M
3
for Thermal Conductivity
sensors ..........................................................................................................................72
Figure 31 Capacitance of the capacitors in (pF) vs. Absolute Humidity for Thermal
Conductivity sensors in (%) ..........................................................................................72
Figure 32 Use Case Diagram for MCU ..........................................................................75
Figure 33 Use Case Diagram for the wireless sensor. ...................................................75
Figure 34 MRF24J40MB Block Diagram ........................................................................76
Figure 35 MRF24J40MB to Microcontroller Interface .....................................................77
Figure 36 Block Diagram for MRF24WB0MA.................................................................79
Figure 37 MRF24WB0MA interface to microcontroller ..................................................79
Figure 38 MRF24WB0MA Power State diagram ............................................................81