GENERIC CONTROL OF ELECTRICAL ENVIRONMENT THROUGH A WEBPAGE - IT Acumens. COM

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GENERIC CONTROL OF ELECTRICAL ENVIRONMENT THROUGH
A WEBPAGE - IT Acumens. COM
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AIM

• The aim of the project is to control electrical
  devices from a remote location through a web
  page.

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SOFTWARE REQUIRED

• Java 2 Enterprise Edition(J2EE)
• Java Development Kit (JDK1.3)
• Apache Tomcat Server 1.4.1
• Internet Explorer
• Microsoft Access
• Microsoft Word( for documentation)

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HARDWARE REQUIRED

• Pentium III processor
• 64 MB RAM
• 10 GB Hard Disk
• Operating system windows 98
• PC Add-On card with PIA chip(s)
• An External port board.
• A dedicated designed interface

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SCOPE OF THE PROJECT

• CONTROL THROUGH IR
• Range is limited.
• Line of sight
• CONTROL THROUGH MICROWAVE
• Transmitter Receiver are costly.

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DESCRIPTION

• The electrical devices that are to be controlled
  are connected to the home PC through a designed
  dedicated interface.The status word of the
  devices are posted to the PC through the PIA
  present in the CPU of the home PC.The status word
  is then uploaded to the web server.

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• At the server the individual status of the
  devices are decoded and posted to the web page.A
  remote user logs in and checks the current status
  of the devices,if required the user changes the
  status of the devices.The changed status is then
  posted to the web server.The control word is then
  encoded and posted to the home PC.The changed
  status of the devices are reflected.

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STATUS DETECTING CIRCUIT
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CONTROL CIRCUIT
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8255 CHIP

• The 8255 chip is called a Programmable Interface
  Adapter(PIA).
• The three buses used for the interface are the
  address bus,data bus and the control bus.
• The 8255 contains three individual I/O ports.
• The microprocessor connects to certain pins on
  the 8255.

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• Each port can be made to function either as Input
  port or an Output port by setting the control
  word.
• Block B provides the logic for reading and
  writing to each port of the chip.
• The electrical status of the devices is
  retrieved through the C program using the
  port-based instructions.
• The port-based instructions are
•       _inp (port number)
•       _outp (port number, value)

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• _inp is used to read the value from the port and
• _outp is used to write the value to the port.

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START
SELECT THE DEVICES TO BE CONTROL
CONNECT THE DEVICES TO THE HARDWARE INTERFACE
A
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CONNECT THE INTERFACE TO THE PIA IN THE PC
USING THE PORTBASED INSTRUCTIONS RETRIEVE THE
STATUS WORD

IS THERE A CHANGE IN STATUS WORD
A
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UPLOAD THE CHANGED STATUS WORD TO THE SERVER
THE STATUS WORD IS DECODED AND IT IS STORED IN
DATABASE IN THE SERVER
THE REMOTE USERS AUTHENTICATION IS CHECKED
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IS THE USER A AUTHENTICATED USER
NO
DIRECT THE USER TO A RE-LOGIN PAGE
IS THE USER ADMINISTRATOR
NO
DOES THE USER HAVE WRITE PERMISSION
YES
DIRECTED TO THE ADMINISTRATOR PAGE
C
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C
DIRECT TO THE CHANGE STATUS PAGE
DIRECT THE USER TO THE DISPLAY STATUS PAGE
THE USER CHANGES THE STATUS AND SUBMITS THE
FORM
O
THE ENCODED VALUE IS WRITTEN IN THE SERVER
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THE CONTROL WORD IS POSTED TO THE HOME PC
THE CONTROL WORD IS SENT TO THE OUTPUT PORT OF
PIA
THE CHANGED STATUS IS REFLECTED ON THE DEVICES
AT HOME.
O
STOP
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MODULES

• Retrieving status word from the electrical
  device.
• Posting the control word to the web server.
• User authentication and display of current
  status.
• User changing the status of the required device.

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• Control word stored in the home PC.
• Reflecting the changed status on device.

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ACQUIRING DEVICE STATUS

• The electrical devices are connected to the
  interface designed.
• The interface is connected to the home PC through
  a Peripheral Interface Adapter.
• The Status word is obtained through a flat cable
  connected from the PC to the port board.
• The value is then posted to the server.

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DECODING

• A Servlet program is written to decode the
  status word.
• The current status of the device are posted to
  the web page.

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ADMINISTRATOR

• The administrator has the rights to add/delete
  the users from/to the list.
• The administrator categorizes the users with two
  permissions
• Read permission.
• Read /write
  permission.

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REMOTE USER

• Authenticated users are allowed to access the web
  page.
• The users with read permission can only view the
  current status of the device.
• The users with read/write permission can view as
  well as change the status of the device.
• The changed status is stored in the web servers
  database.

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TRANSACTION OF DATA
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ENCODING CONTROL WORD

• The status stored in the database are encoded
  using a servlet program.
• The encoded value is a decimal number which
  varies from 0 to 255.
• The encoded control word is posted from the web
  server to the home PC.

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AT THE HOME PC

• The encoded control word is send to the interface
  through a java program.
• Decoding is done in the interface as a result of
  which individual device status are changed.

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OUTPUT SCREENS
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LOGIN SCREEN
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CURRENT STATUS
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REQUIRED STATUS
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DATA STORED