Remote Control of Home Appliances Using the Internet Team DEC0905 Elie Abichar Rachel Ayoroa Chris Tefer Ananta Upadhyaya Faculty Advisor & Client: Dr. Ahmed Kamal Website: http://seniord.ece.iastate.edu/dec0905/

Abstract Problem Statement Design and Implement a system that will enable users to remotely control their home appliances through the Internet and get feedback from the appliance. Need Statement The system designed will provide a new product to the newly emerging automation and controls market. It will be used in households to remotely control and monitor various home appliances through the Internet. DEC 0905

Concept Sketch plate DEC 0905 User Internet IR Sensor Server Bluetooth USB Adapter Bluetooth module Microcontroller Garage door Opener plate DEC 0905

System Operating Environment The system components will operate indoors under normal room temperature or in an environment protected from weather elements. The system would operate within the temperature and humidity limits for proper operation of hardware. A Internet connection would be necessary for the operation of the system. DEC 0905

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 the access point Must communicate with the access point wirelessly Must interface directly to the Microcontroller DEC 0905

Functional Requirements (2) Microcontroller Units Must be able to receive commands from the Bluetooth module Must be able to send status messages to the Bluetooth 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 those devices, to the user Must have a logon method for verifying users DEC 0905

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 50 feet DEC 0905

Market and Literature Survey Similar 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 DEC 0905

Deliverables Server User Interface Device control Unit Project Plan Project Poster Design Documents Final Report DEC 0905

Work Breakdown DEC 0905

Resource Requirement Item Cost Easy Bluetooth Module $ 70 LMX9820 $27 Bluetooth USB Adapter $15 IR Sensor $10 Garage Door Opener Donated by Door & Fence Store Microcontroller Donated by Team May0613 Poster $50 Total $ 172 DEC 0905

Project Schedule DEC 0905

Risks Time management: All four team members are currently full time students Project Complexity: Lot of subsystems connected together that we have to figure out how would they communicate to each other New technologies: Deal with new hardware and software DEC 0905

User Interface Description DEC 0905

Server Connections DEC 0905

Server Description The server contains three components. The HTML website, JavaScript page handler, and the HTTP server. Chris I’m assuming you’ll talk about how the server works so feel free to set this up how you want. The HTML allows for an easy user interface. JavaScript communicates with the server via AJAX The server communicates with the devices via Bluetooth DEC 0905

Device Control Unit ( DCU ) The Device Control Unit consists of the microcontroller and a Bluetooth module that is connected to it The Bluetooth Module: provide the microcontroller the ability to wirelessly communicate with Bluetooth dongle on the server side The Microcontroller: connected directly at the other end to the home appliance and is able to control that device DEC 0905

Bluetooth Communication The Bluetooth dongle: connected on the server side The Bluetooth module: connected on the UART (Universal Asynchronous Receiver / Transmitter) port of the microcontroller which is PORT D This PORT has a UART transmit pin TX, a UART receive pin Rx and a power and ground pins Bluetooth module sends data at 9600 baud rate and the microcontroller system clock runs at 4MHz, we had to calculate the baud rate register value to be 4M/9600/16 - 1 rounded to nearest integer A specific protocol was setup for proper communication Do we want to talk about how BT-BT communication works like we did on the poster? DEC 0905 Bluetooth Module

Send device name {gd,th} for garage door and thermostat respectively BT dongle BT module BluetoothConnection n Request for command Send device name {gd,th} for garage door and thermostat respectively Device name (**) a Request a universal action b Acknowledgement Request action * = {o,c} for opening or closing the garage door respectively * b Acknowledgement (command executed) s Request the current status of the garage door up: garage door is open dn: garage door is closed Respond the with status ** = {up,dn} where * * DEC 0905

Microcontroller (STK300) The microcontroller: has 6 different ports with 10 pins each Port B is used to power up the garage door opener control circuit, and the control signal wire is as well connected on Pin 2 of Port B This pin can be programmed using AVR studio so it sends 5V signals to toggle the switch DEC 0905

Relay Circuit Connected between the microcontroller and the garage door opener Takes 5V output from the microcontroller and switches 24V garage door motor Diode protects the microcontroller from back EMF Relay DEC 0905

IR Sensor Used to detect the status of the garage door Range: 9cm to 90cm The sensor’s Voltage reference is connected to the Aref pin of the analog port and the sensor’s digital output is connected to ADC pin of the microcontroller The conversion is done programmatically DEC 0905

Test Plan Software Testing Unit testing: Isolate the smallest piece of a testable code and 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 user interface Non functional Software Testing Usability testing: Usability testing depends on the user feedback regarding the user interface. Hardware Testing Each hardware component would be tested as soon as we receive it Double check wired connection Double check components configuration DEC 0905

Server Testing The functionality of the server was first developed using a test program. This program allowed us to connect to the microcontroller via Bluetooth connection without using a fully developed web server In later development of the server we also used a dialog box to let us know what actions were being performed on the server Server test output Server Test Program DEC 0905

Hardware Testing Microcontroller Testing Bray’s Terminal Since the microcontroller communicates to three separate devices via UART, a test module that communicated through a computer’s serial port was developed using the UART library and a serial communication program called Bray’s Terminal Once the UART code was developed for basic serial communication, three separate test modules were developed for the infrared sensor, Bluetooth device, and garage door relay. Each module was developed to run on a separate port of the microcontroller An LCD screen connected to the microcontroller was used to output results for each test module until the Bluetooth server was fully functional Bray’s Terminal DEC 0905 Microcontroller Testing

Future Work More Devices with multiple microcontrollers Adding more security features Adding user authentication and separation of device controls DEC 0905

Final Thoughts Allocating more resources to the server Being able to begin basic implementation during the planning stage Understanding the scope of our project DEC 0905

Any Questions? Internet DEC 0905