Final Presentation April 20, 2010

Team Members Read Caver Hardware Design Microcontrollers Wireless Communication Technical Documentation Steven Price Software Development LCD Interfacing Energy Metering Hardware Implementation James Evans Software Design Hardware Implementation LCD Interfacing Website Maintenance Albert Shannon Hardware Implementation Energy Metering Microcontrollers GUI Design Technical Documentation

Overview  Introduction Problems Statement Solution  Constraints Technical Practical  Prototype Design  Subsystem Testing  System Testing  Design II Goals

Introduction  SmartStat is a wireless thermostat with energy computation abilities  Used in both residential and commercial settings  Sets temperature for heat/AC to run, provides power monitoring capabilities  Thermostat module communicates wirelessly with 2 power consumption modules

NASA Sponsorship  Team SmartStat is sponsored by NASA. The team investigated the application of wireless technologies for sensor communication. Specifically, the IEEE Standard for wireless communication was implemented. ○ Emphasis on low power, low speed wireless communications. The network can also be monitored via Ethernet.

Problem  Currently, there is no practical way to monitor the power consumption of specific high powered systems such as AC/heating units

Solution  Use low power wireless technology  Send power consumption information to control unit (thermostat)  Send information to RJ45 port

Technical Design Constraints ConstraintDescription Temperature Reading Range and Accuracy SmartStat must be able to read temperatures in the range of 50°F to 100°F, with an accuracy of 98% in the comfort range of 65°F to 75°F Energy Reading Range and Accuracy The energy monitoring modules must measure a voltage of 240Vac, maximum current of 60A, with an accuracy of 98%. Supply VoltageThe control unit must use 24Vac for supply voltage. Energy monitoring modules must use 120Vac for supply voltage. Ethernet InterfacingA RJ45 module must be used to allow for energy monitoring via an Ethernet connection. Transmission Distance The wireless modules must have a range equal to or greater than 500ft (unobstructed line-of-sight).

Practical Constraints  SmartStat must be compatible with the different types of HVAC systems. [1] Conventional [2] Water and ground source heat exchangers [3] Air source heat exchanger

Health and Safety  The control module must not allow the user to come into contact with hazardous voltages; energy monitoring modules must be sealed. [5] [4]

Prototyping Design Thermostat Power Monitor (air handler) Power Monitor (compressor) Ethernet (RJ45)

Thermostat – Main Unit

Energy Monitoring Modules

RJ45 Module

Subsystem Testing  Main unit Basic thermostat controls Synapse wireless module communication ○ Energy data (covered in system test) ○ Number of wireless nodes connected (covered in system test)  Energy Monitoring Modules Energy metering Synapse wireless communication  RJ-45 Module Lantronix module and GUI Synapse wireless communication  Synapse Wireless Modules  Power Supplies

Main Unit Basic Thermostat Controls Four LEDs to the right of breadboard represent the EM heat, Valve, Compressor, and blower controls of the HVAC system, respectively

Design Constraint – Satisfied Range of 50°F to 100°F, with an accuracy of 98% in the comfort range of 65°F to 75°F

Energy Monitoring Modules 100W Bulb Measured (ms)Calculated (ms) % Error W Bulb Measured (ms)Calculated (ms) % Error % Error Calculations Design Constraint – Satisfied Energy Metering with 98% Accuracy Output Pulses from ADE5577 Energy Metering IC (prior to calibration)

Lantronix Module and GUI Serial communication from a TCP/IP socket to serial pin of Lantronix module Graphical User Interface used to communicate with Lantronix XPort module via TCP/IP socket

Wireless to Ethernet Design Constrain – Satisfied A RJ45 module must be used to allow for energy monitoring via an Ethernet connection Synapse Module to XPort communication

Synapse Modules Design Constraint – Satisfied The wireless modules must have a range equal to or greater than 500ft (unobstructed line-of-sight).

Power Supplies Voltage in (AC)Voltage out (DC)5V rail3.3V rail Module Module Each of the energy monitoring modules must operate from 120Vac, and require two voltage rails, 3.3Vdc and 5Vdc. Design Constrain – Satisfied

System Testing

Wireless energy data received and displayed Wireless node count (if !=2), some nodes are missing

Fulfilled Design Constraints ConstraintSatisfied Temperature Reading Range and AccuracyYes Energy Reading Range and Accuracy Yes Supply VoltageYes Ethernet InterfacingYes Transmission DistanceYes

Design II Goals  PCB Design  Enclosures Wall-mountable main unit Sealed energy monitoring modules  Increase the amount of displayed energy information Decimal representation of consumed energy Cost of used energy

References [1] “Why Choose Us,” Broward Factor Service. [Online] Available: [Accessed: Feb. 22, 2010]. [2] “You Can Save 80% per month on Your Electric Bill,” Energy Trio. [Online] Available: [Accessed: Feb. 22, 2010]. [3] “Air Handlers,” Amana. [Online] Available: [Accessed: Feb. 22, 2010]. [4] “Danger High Voltage,” Speedysigns. [Online] Available: Feb. 22, 2010]. [5] “Sign High Voltage clip art,” Clker.com. [Online] Available: [Accessed: Feb. 22, 2010].

Questions?