dec0905 irp presentation

8/7/2019 DEC0905 IRP Presentation

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Remote Control of Home

Appliances Using theInternetTeam DEC0905

Elie Abichar

Rachel Ayoroa Chris Tefer Ananta Upadhyaya

Faculty Advisor & Client: Dr. Ahmed Kamal

Website:http://seniord.ece.iastate.edu/dec0905/


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Abstract

Problem Statement

Design and Implement a system that willenable users to remotely control their homeappliances through the Internet and getfeedback from the appliance.

Need Statement

The system designed will provide a newproduct to the newly emerging automation andcontrols market. It will be used in householdsto remotely control and monitor various home

appliances through the Internet.DEC 0905 2


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Concept SketchUser

Server Bluetooth

USB

Adapter

Garage door

OpenerBluetooth module Microcontroller

Internet

IR Sensor

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System Operating

Environment The system components will operate indoors undernormal room temperature or in an environment protectedfrom weather elements.

The system would operate within the temperature andhumidity limits for proper operation of hardware.

A Internet connection would be necessary for the

operation of the system.

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Functional Requirements

Bluetooth Dongle

Must Be Wireless

Must be able to send and receive messages from the

blue tooth module

Bluetooth Module

Must be able to send and receive messages from theaccess point

Must communicate with the access point wirelessly

Must interface directly to the Microcontroller

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Functional Requirements(2)

Microcontroller Units

Must be able to receive commands from theBluetooth module

Must be able to send status messages to theBluetooth dongle

Must be able to control the device

Must be able to parse and interpret commands

Client Interface

Must be able to receive user input

Must display the devices, and controls to thosedevices, to the user DEC 0905 6


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Non-Functional

Requirements GUI must have an intuitive look and feel for the user

Wireless antennas must be internal or shorter than

4 inches

Access point must have a footprint of less than 50feet

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Market and Literature

SurveySimilar Systems HAI products

Proliphix

Technologies

Wireless communication: Zigbee, Bluetooth.WLAN

Security: AES, RSA, MD5 Microcontrollers: AtMega 128, Jennic, MIPS

Transceivers: Easy Bluetooth, LMX 9820, WT11,WT12

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Deliverables

Server

User Interface

Device control Unit Project Plan

Project Poster

Design Documents

Final Report

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Work Breakdown

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Resource Requirement

Item Cost

Easy Bluetooth Module $ 70

LMX9820 $27

Bluetooth USB Adapter $15IR Sensor $10

Garage Door Opener Donated by Door & Fence Store

Microcontroller Donated by Team May0613

Poster $50

Total $ 172

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Project Schedule

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Risks

Time management: All four team members arecurrently full time students

Project Complexity: Lot of subsystemsconnected together that we have to figure outhow would they communicate to each other

New technologies: Deal with new hardware andsoftware

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User Interface Description

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Server Connections

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Server Description

The server contains three components. The HTMLwebsite, JavaScript page handler, and the HTTP server.

The HTML allows for an easy user interface. JavaScript communicates with the server via AJAX The server communicates with the devices via

Bluetooth

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Device Control Unit ( DCU )

The Device Control Unit consists of the microcontrollerand a Bluetooth module that is connected to it

The Bluetooth Module: provide the microcontroller theability to wirelessly communicate with Bluetooth dongle onthe server side

The Microcontroller: connected directly at the other end

to the home appliance and is able to control that device

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Bluetooth Communication

The Bluetooth dongle: connected on the server side The Bluetooth module: connected on the UART (Universal

Asynchronous Receiver / Transmitter) port of the microcontrollerwhich is PORT D

This PORT has a UART transmit pin TX, a UART receive pin Rxand a power and ground pins

Bluetooth module sends data at 9600 baud rate and themicrocontroller system clock runs at 4MHz, we had to calculatethe baud rate register value to be 4M/9600/16 - 1 rounded to

nearest integer A specific protocol was setup for proper communication

BluetoothModule

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up: garage door is open dn: garage door isclosed

BT dongle BT module

BluetoothConnection

n

Device name (**)

a

b

*

b

s

* *

Request for command

Send device name {gd,th} for garage door andthermostat respectively

Request a universal action

Acknowledgement

Request action * = {o,c} for opening or closingthe garage door respectively

Acknowledgement (command executed)

Request the current status of the garage door

Respond the with status ** = {up,dn} where

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Microcontroller (STK300)

The microcontroller: has 6 different ports with 10pins each

Port B is used to power up the garage door openercontrol circuit, and the control signal wire is as wellconnected on Pin 2 of Port B

This pin can be programmed using AVR studio so itsends 5V signals to toggle the switch

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Relay Circuit

Connected between themicrocontroller and the garage dooropener

Takes 5V output from themicrocontroller and switches 24Vgarage door motor

Diode protects the microcontrollerfrom back EMF

Relay

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IR Sensor Used to detect the status of the garage door

Range: 9cm to 90cm

The sensors Voltage reference is connected to the Arefpin of the analog port and the sensors digital output isconnected to ADC pin of the microcontroller

The conversion is done programmatically

IR Sensor

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Test Plan

Software Testing

Unit testing: Isolate the smallest piece of a testable codeand test it

Regression testing: Re-run previously run test after

modifying functionality End Product testing: All of the functional requirements

would be tested at the very high level, using the userinterface

Non functional Software Testing

Usability testing: Usability testing depends on theuser feedback regarding the user interface.

Hardware Testing

Each hardware component would be tested as soon as weDEC 0905 23


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Server Testing

The functionality of the server was first developedusing a test program. This program allowed us toconnect to the microcontroller via Bluetooth connectionwithout using a fully developed web server

In later development of the server we also used adialog box to let us know what actions were beingperformed on the server

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Server TestProgram


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Hardware Testing

Since the microcontrollercommunicates to three

separate devices via UART, atest module that

communicated through acomputers serial port wasdeveloped using the UART

librar and a serialDEC 0905 25Brays Terminal MicrocontrollerTesting


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Future Work

More Devices with multiplemicrocontrollers

Adding more security features

Adding user authentication andseparation of device controls

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Final Thoughts

Allocating more resources to theserver

Being able to begin basicimplementation during the planningstage

Understanding the scope of our project

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Any Questions?

Internet

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