Transcript Remote Control of Home Appliances Using the Internet

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
2
Concept Sketch
User
Internet
IR Sensor
Server
Bluetooth
USB
Adapter
Bluetooth module
Microcontroller
DEC 0905
Garage door
Opener
3
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
4
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
5
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
6
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
7
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
8
Deliverables
•
•
•
•
•
•
•
Server
User Interface
Device control Unit
Project Plan
Project Poster
Design Documents
Final Report
DEC 0905
9
Work Breakdown
DEC 0905
10
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
11
Project Schedule
DEC 0905
12
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
13
User Interface Description
DEC 0905
14
Server Connections
DEC 0905
15
Server Description
The server contains three components. The HTML
website, 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
DEC 0905
16
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
17
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
DEC 0905
Bluetooth Module
18
BT dongle
BT module
BluetoothConnection
n
Device name (**)
a
Request for command
Send device name {gd,th} for garage door and
thermostat respectively
Request a universal action
b
Acknowledgement
*
Request action * = {o,c} for opening or closing
the garage door respectively
Acknowledgement (command executed)
b
s
**
Request the current status of the garage door
Respond the with status ** = {up,dn} where
• up: garage door is open • dn: garage door is
closed
DEC 0905
19
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
20
Relay Circuit
•
Connected between the
microcontroller and the garage door
opener
Relay
•
Takes 5V output from the
microcontroller and switches 24V
garage door motor
•
Diode protects the microcontroller
from back EMF
DEC 0905
21
IR Sensor
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
22
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
23
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 Program
Server test output
DEC 0905
24
Hardware Testing
• 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
Microcontroller Testing
DEC 0905
25
Future Work

More Devices with multiple
microcontrollers

Adding more security features

Adding user authentication and
separation of device controls
DEC 0905
26
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
27
Any Questions?
Internet
DEC 0905
28