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PASSWORD CONTROLLER BASEDAPPLIANCE

ABSTRACTSecurity is a prime concern in our day-to-day life. Everyone wants to be as muchsecure as possible. An access control for any appliances forms a vital link in a security chain. The microcontroller based light is an access control system that allows only authorized persons to access restricted devices. Present project deals with the activation of the power supply of an electric bulb. The system is fully controlled by the 8 bit microcontroller P89V51RD2 which has a flash for the program memory. The password is stored in the flash memory. The system has a Keypad by which the password can be entered through it. The user entered password is compared with the password in the flash memory. When the enteredpassword matches with the password stored in the memory then the relay gets activated, LCD displays as “ACCESS GRANTED” and the bulb glows. If the password entered is wrong then the LCD displays that “ACCESS DENIED”. The same password is then used to off the bulb. The system uses 16*2 alphanumeric LCD that displays the password in a secure way entered using the keypad of 4*3 push button switches. The total circuit enhances the user to provide a secured operation. The application can be used with various appliances like door lock system, alarm systems etc. The security provides an advance feature for the presenthome automation industry.

INTRODUCTION

There are now a days in the market many different types of Home Automation Systems that provides many appliances to users which make them comfortable. The main goal of the project is to develop a very-low cost and small electronic system that provides security to the home appliances. The appliance can be light bulb, door lock system or alarming system. The Password Controller Based Lighting mainly consists of a mother board circuit that has P89V51RD2 microcontroller, MAX 232 IC and LCD display. The circuit board also connects components such as 4 x 3 Keypad, Relay, ULN 2003 IC and a Regulated Power Supply. The microcontroller has a 64kB of on-chip flash memory and 1024B of RAM. The microcontroller is programmed such that the LCD displays to enter the password which is accepted by the keypad. When this password matches with the password that is entered by the user, the ULN 2003 IC makes the relay to activate and thus the relay functions to switch the light.

SYSTEM BLOCK DIAGRAM

SYSTEM DESCRIPTION

The system for the password controller has the following components:

1. P89V51RD2 Micro controller

2. MAX 232 IC

3. ULN 2003 IC

4. 16*2 alphanumeric LCD Display

5. 4 x 3 Keypad

6. 12 V Electromagnetic Relay

7. Regulated Power Supply

8. Adaptor

9. Wires and

10. Electric Bulb as appliance.

SYSTEM INSTALLATION

The microcontroller, MAX 232 IC, LCD display, resistors, capacitors and diodes etc., are together soldered in a circuit board. The circuit is connected to the computer through a serial interface and switched ‘ON’ by an adaptor connected to the mains. The microcontroller is programmed by software and the serial cable is removed. The keypad is connected to the microcontroller of port 0.1 to 0.7. Ports 1.2 to 1.7 are used for the LCD display. The port 2.0 pin of microcontroller is connected to 1 st pin of ULN 2003 IC. 8th pin of the ULN 2003 IC is grounded. 9th pin is supplied with 9V from Regulated Power Supply. The 16th pin of the ULN 2003 IC is connected to the Relay. The relay has 5 pins in which 1 st pin is connected to RPS for 12V power supply.2nd pin is grounded. One wire of the Power supply and one wire from the bulb are joined together and the other two wires are connected to remaining two pins. One pin is left unused.

SYSTEM OPERATION

Password Controller Based Lightening System is used for providing security to the appliances. The sequence of operations given below shall be followed for operating the system. 1. Switch ‘ON’ the mains of the bulb, Regulated Power Supply, adapter and switch in the circuit board. 2. The LCD display prompts to enter the Password. Type in the password from the keypad provided with push button switches. 3. If the password entered is correct LCD displays as “ACCESS GRANTED” and the relay activates to glow the bulb. 4. If the password entered is not correct LCD displays as “ACCESS DENIED”. 5. Enter the correct password which makes the bulb glow and off. We can provide even a door lock in place of bulb. The operation follows same as above.

SCHEMATIC DIAGRAM OF MOTHER BOARD

The schematic diagram of the Circuit Board is shown in two parts:

1. Main Circuit.

2. Power Supply Unit

MAIN CIRCUIT DIAGRAM

POWER SUPPLY CIRCUIT DIAGRAM

APPLICATIONS & FUTURE ASPECTS

Password Controller Based Lightening is very useful to provide security to any appliances. The designed system can be used for control any electrical appliance ,if the respective appliance gets placed in the position of bulb. Like a door lock system, alarming system etc. This project can be used in wide variety of areas such as

i. Home Automation i.e for house hold purposes

ii. Industrial Automation like schools, offices etc.

FUTURE ASPECTS: Some of the pins of the microcontroller are left unused & hence can be used in the future by defining the functions. We can control many devices by increasing the ULN2003 IC’s (which are connected to the microcontroller). We may implement this project for the industrial purposes also. This system will act according to the parameters given by the user.