Spencer Sullivan EE Tyler Ensey EE Gabriel Holland CpE Omar Mohammed CpE Sponsored By Motivation We wanted to create a product that could be used domestically That promotes energy efficient practices ID: 934532
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Slide1
EnergyGuard
Home Management & Control System
Spencer Sullivan, EETyler Ensey, EEGabriel Holland, CpEOmar Mohammed, CpE
Sponsored By:
Slide2Motivation
We wanted to create a product that could be used domesticallyThat promotes energy efficient practicesHas significant hardware & software components to satisfy all members
Utilizes cyber-security in its software designIs easily installed with little cost and doesn't require major home modificationUses knowledge acquired from embedded systems
Slide3Design Requirements
Plug and Play hardware design
Report Data to user via app. Data includes Energy consumption per for system and per device
A server will be used as a HUB for the system. Outlets will send data to the server. Server collects data for historical display
Slide4Design Specifications
Power supply of 120 V 15 A given from household wall outlet
3 outlets each with a 120 V 15 A given from the power supply Each outlet must have a relay capable of handling a voltage supply of 120V AC
Also supply 3.3-5V DC line for MCU, LED’s etc.
Slide5Power Strip
3 outlets to power devices
Power supplied from wall outlet
Circuits to read current and voltage and calculate power
Slide6Connectors
Originally we chose the C14 connector for our design
Decided against it since we noticed that the inputs were square
Decided on the part shown since it will be applicable to our design
Manufacturer Part Number
738W-X2/01
Voltage Rating
125 V
Current Rating
15 A
Mouser, DigiKey, Amazon
$0.58-$7.00
Slide7VSK-S2-5U
AC-DC Converter
Up to 2W Continuous Power Compact Board Mount Design 85-305VAC/12—
430VDC Input
5VDC Output
Used to power relays and relay driver Output is connected to a LDO voltage regulator, which outputs 3.3V that powers the MCU
102-2589-ND, Digi-Key, $13.25
Slide8TPS77033DBVT LDO Linear Regulator
50mA Low-Dropout Regulator
3.3V Fixed-Output Only 17µA Quiescent Current at 50mA
Dropout Voltage Typically 35mV at 50mA
Over Current Limitation Used to power the MCU
TPS77033DBVT, TI, $1.34
Slide9Power SUPPLY
Supplied from Wall outlet at 120 V 15 A
Neutral and live will come from wall outlet and pass through and AC/DC converter Output a 0 and 5 V line and 5 V will go to linear regulator for a 3.3 V line
Slide10Voltage Sensing Circuit
Where
is the output of the voltage circuit,
is the offset of the instrumentation amplifier, and
is the
inverse of the transfer function of the below voltage
circuit which is
661 divided by the gain of the Op-Amp circuit which is 1.14. Giving a
K
v
value of 580.
Slide11Voltage Instrumentation Amplifier
This circuit offers a 734 mV offset since the MCU can only read positive voltage.
The gain offered by this circuit is
1.14
The differential output of the voltage reading circuit is converted to a single sided output by the amplifier.
Slide12Current Sensing Circuit
Where
is the output of the voltage circuit,
is the offset of the instrumentation amplifier, and
is
the inverse of the
gain of the
Op-Amp current
circuit which is
.
is the value if the shunt resistor which is
.
Slide13Current Instrumentation Amplifier
This circuit offers a 734 mV offset since the MCU can only read positive voltage.
The gain offered by this circuit is 11
The differential output of the current reading circuit is converted to a single sided output by the amplifier.
Slide14Power Calculations
Slide15LMV324MX 14 pin IC Op-
AMp
4 Op-Amps to a packageSupply voltage of 3.3 V and -3.3V (Max 5.5)
Little distortion and noise due to small PCB tracesLow supply current
LMV324MX,
Digikey
, $1.07
Slide16ULN2003LVDR Relay Driver
Used to control or “drive” the three relays
7-Channel High Current Sink Drivers Supports a Wide Range of 3V-to-5V Relays Compatible to 3.3V and 5.0V Microcontrollers and Logic Interface
Input RC-Snubber Low Input and Output Leakage Currents
ULN2003LVDR, TI, $0.63
Slide17PB1696-ND Relays
Contact Arrangement – SPDT (1 Form C)
Rated Voltage – 250VAC Rated Current – 16A Polarized Bistable Version with 2 Coils
Reinforced Insulation Operate/Reset Time Max – 10/
10ms
PB1696-ND, Digi-Key, $5.93
Slide18Circuit for Relays
Each outlet has a relay to switch the outlet on or off.
The relay driver receives inputs from the MCU to control which outlet to turn on or off
Slide19PCB Layout
Slide20Hardware testing and issues
PCB design problems
PCB Soldering problemsOp amp problems
Slide21Embedded Design
Choices, Decision, & Design
Slide22CC3200
We chose the CC3200Cheaper OptionEase of Connectivity
No need for extra peripherals4 ADC input pins
Although there are some limitations,
12-bit ADC, less accurate than we need
New MCU, less documentation & reference code
Slide23Design Influence/Code Reference
TI's WLAN_Station_Connect_Demo - Access Point ConnectivityTI's
HTTP_Clinet_Demo – Establish Server Connection, Post DataTI's ADC_Demo – Enables ADC SamplingTI's Blinky_Demo – LED Functionality
TI's Interrupt_Demo – Interrupt HandlingTI's Metrology_Data
– Enhance Sample Accuracy
__
Slide24Software Overview
Divided into 5 sections:Configuration & InitializationData Collection
Data Manipulation & CalculationEstablishing Connectivity Posting Data & Power StatusRepeat For Next Socket
Configuration & Initialization
Data Collection
Configuration & Initialization
Configuration & Initialization
Configuration & Initialization
Configuration & Initialization
Slide25Discretization
ADC value returns with time stamp12-bit ADC valueSimulate a larger value by summing samples together
64 samples were summed for an increased accuracy of 6 bitsAccurate to .00005 V, 50% more accurate
Slide26Calculation & Manipulation
Calculate accurate offset through sample averageCalculate Vin &
Iin by removing offset, applying circuit specific equationsCalculate Real Power, Apparent Power, Reactive PowerCalculate Power FactorApply Power Factor to True Power Calculation First calculate summations, then apply remaining equation
Slide27COnnecting & Posting Data
Connect through a local Access PointThen Establish Connection with the Server, 3
jspsPost Power:Socket Number, Product ID, and Power CalculationPost Socket On/Off Status:Socket Number, Product ID, and On/Off StatusSend Final Post to establish a timestamp
Slide28Website – energyguard.tk
Summary & Design
Slide29FUNCTIonalities
Login and Account creationView socket status (on or off)View current power reading
View energy used in the:Past hourPast dayCurrent month
Slide30Implementation
The front end - JavaScript, Wix (HTML, CSS)
The back end - JavaServer Pages (JSP). Event listeners to trigger JavaScript. JavaScript then triggers the JSP using jQuery POST, GET methods. The JSP connects to the database on the server The application is placed on a tomcat web server that connects to a
postgresql database.
Slide31Issues/challenges
Learning how to query, and manipulate data based on results in JSPGET, POST JSON parser in CC3200Cache issues as a result of using HTML generated by Wix
Debugging JSPMaking the UI look pretty (Ended up using Wix)
Slide32Work Distribution
Component
Primary Engineer
Secondary Engineer
Socket Design
SpencerTyler
Relay & Relay Driver Design
Tyler
Spencer
Power & Current Measurement Design
Spencer
Tyler
Power Strip PCB
S/T
N/A
Embedded
Programming
Gabriel
Omar
Power Strip LED Design
Spencer
Tyler
Surge Protector Design
Spencer
Tyler
MCU Peripherals
Gabriel
Omar
Web App
Omar
Gabriel
Database
Omar
Gabriel
Server
Omar
Gabriel
Slide33Budget
Item
Quantity
Price/Unit
Total Cost
Item
Quantity
Price/Unit
Total Cost
S108T02 Relay
3
$5.00
$15.00
Rocker Switch
1
$0.93
$0.93
ULN2003LV Relay Driver
3
$0.56
$1.68
Push Button Switch
1
$0.53
$0.53
Soldering Iron
1
$50.00
$50.00
Solder
1
$10.00
$10.00
Passive Components
Many
Varying
$20.00 (Approximate)
Printed Circuit Boards
3
$33.00
$99.00
Female Socket
3
$4.20
$12.60
CC3200
LaunchPad
1
$30.00
$30.00
Male Socket
1
$2.30
$2.30
CC3200 Microcontroller
1
$17.00
$34.00
Extension Cord
1
$10
$10
Emergency Parts
$207.53
Smart Thermostat Housing (wood & plastic)
1
$30.00
$30.00 (Approximate)
Total Estimated Cost:
$570.45
Power Strip Housing (Plastic)
1
$20.00
$20.00 (Approximate)
Potentiometer
1
$0.95
$0.95
Wire
1
$25.00
$25.00
Rocker Switch
1
$0.93
$0.93
Slide34Questions?
.