28-07-2012, 09:57 AM
ELECTRICAL APPLIANCES CONTROL THROUGH PC
ELECTRICAL APPLIANCES.ppt (Size: 2.47 MB / Downloads: 165)
What Is Home Automation
Home automation deals with providing a network in the house which links
computers & peripheral equipment.
smart chip bearing household appliances like dish washers, washing machines, microwaves and other electrical appliances.
sub-systems like Heating, Ventilation, Air-conditioning (HVAC), and security systems.
WHAT THE PROJECT IS ALL ABOUT……?
The aim of the project is to control home appliances like Television, Refrigerator, and Lights and other home electrical appliances using a personal computer.
In this project a PC is interfaced with a micro-controller and it is connected to relays to which the appliances which are to be controlled are connected.
The micro-controller controls the relays for switching the appliances, ON or OFF. Pre-defined symbols are sent to the Microcontroller through RS232 cable
AT89C51 MICROCONTROLLER
The microcontroller used in this project is At89s52. Atmel Corporation introduced this at89s52 microcontroller.
This microcontroller belongs to 8051 family.
The At89s52 is a low-voltage, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable memory
POWER SUPPLY
For any circuit a power supply is necessary. For our microcontroller we need a power supply of 5 volts.
It is obtained by using the following block diagram.
RS 232 CABLE
The RS 232 ic used here is a 16 pin ic used to interface the microcontroller with the pc.
It is connected to a RS 232 cable which is connected at the parallel port in pc.
It is used because it can be easily interfaced with pc and acts as a trans receiver.
RELAYS
To control a 230 volts supply devices with a microcontroller of 5 volts supply it cannot be done directly.
It is because the microcontroller cannot withstand such high power.
So in order to do so the relays have been used …
Software used
So the program has been written in assembly language using the 8051 assembler.
The program has been burnt using the keil software onto the microcontroller.
Even the other software like embedded c also can be used to write the program.
CONCLUSION
By using this project we control all the Electrical appliances of Home using Personal Computer via RS232 as the communication medium between pc and controller.
We are controlling the devices like light and fan and etc by sending signals from the pc to controller.
This project also deals with interfacing a high voltage electrical device or DC / AC motor to high sensitive personal computer system.