27-06-2012, 05:15 PM
VOICE BASED SMART HOME AUTOMATION
[attachment=25829]
ABSTRACT
In this present era everything is Automized right from home to industrial area. A home automation system integrates electrical devices in a house with each other, as this project better suit for the physically challenged people .In order to do the regular activities without having others help. The most common thing that they need to do are switching ON/ OFF the loads without much human involvement wherever they are required by using user defined voice commands to switch ON/OFF different electrical devices.
The theme of this project is to control different devices by giving voice commands. One such implementation is home Automation using speech Recognition. By giving different commands various appliances can be controlled automatically. If voice command is received successfully by corresponding device an acknowledge will be coming in the form of beep sound from buzzer. In this way activation of buzzer depends on the voice command received by particular device. The project is built around AT89S52 microcontroller .Voice Recognition module is interfaced with microcontroller to drive the load.
INTRODUCTION
An embedded system is a combination of software and hardware to perform a dedicated task.
Some of the main devices used in embedded products are Microprocessors and Microcontrollers.
Microprocessors are commonly referred to as general purpose processors as they simply accept the inputs, process it and give the output.
In contrast, a microcontroller not only accepts the data as inputs but also manipulates it, interfaces the data with various devices, controls the data and thus finally gives the result.
As everyone in this competitive world prefers to make the things easy and simple to handle, this project sets an example to some extent.
In this project one port is dedicated for speech recognition. The loads are controlled through the Triac Driver. A simple yet powerful program is written in assembly language and burned into the microcontroller to record and accept voice instructions and to control the devices. A 16 X 2 LCD with contrast control preset is provided for status display.
POWER SUPPLY:
The input to the circuit is applied from the regulated power supply. The ac. input i.e., 230V from the mains supply is step down by the transformer to 12V and is fed to a rectifier. The output obtained from the rectifier is a pulsating dc voltage. So in order to get a pure dc voltage, the output voltage from the rectifier is fed to a filter to remove any ac components present even after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc voltage.
Transformer:
Usually, DC voltages are required to operate various electronic equipment and these voltages are 5V, 9V or 12V. But these voltages cannot be obtained directly. Thus the a.c input available at the mains supply i.e., 230V is to be brought down to the required voltage level. This is done by a transformer. Thus, a step down transformer is employed to decrease the voltage to a required level.
Rectifier:
The output from the transformer is fed to the rectifier. It converts A.C. into pulsating D.C. The rectifier may be a half wave or a full wave rectifier. In this project, a bridge rectifier is used because of its merits like good stability and full wave rectification.
Filter:
Capacitive filter is used in this project. It removes the ripples from the output of rectifier and smoothens the D.C. Output received from this filter is constant until the mains voltage and load is maintained constant. However, if either of the two is varied, D.C. voltage received at this point changes. Therefore a regulator is applied at the output stage.
Voltage regulator:
As the name itself implies, it regulates the input applied to it. A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. In this project, power supply of 5V and 12V are required. In order to obtain these voltage levels, 7805 and 7812 voltage regulators are to be used.
[attachment=25829]
ABSTRACT
In this present era everything is Automized right from home to industrial area. A home automation system integrates electrical devices in a house with each other, as this project better suit for the physically challenged people .In order to do the regular activities without having others help. The most common thing that they need to do are switching ON/ OFF the loads without much human involvement wherever they are required by using user defined voice commands to switch ON/OFF different electrical devices.
The theme of this project is to control different devices by giving voice commands. One such implementation is home Automation using speech Recognition. By giving different commands various appliances can be controlled automatically. If voice command is received successfully by corresponding device an acknowledge will be coming in the form of beep sound from buzzer. In this way activation of buzzer depends on the voice command received by particular device. The project is built around AT89S52 microcontroller .Voice Recognition module is interfaced with microcontroller to drive the load.
INTRODUCTION
An embedded system is a combination of software and hardware to perform a dedicated task.
Some of the main devices used in embedded products are Microprocessors and Microcontrollers.
Microprocessors are commonly referred to as general purpose processors as they simply accept the inputs, process it and give the output.
In contrast, a microcontroller not only accepts the data as inputs but also manipulates it, interfaces the data with various devices, controls the data and thus finally gives the result.
As everyone in this competitive world prefers to make the things easy and simple to handle, this project sets an example to some extent.
In this project one port is dedicated for speech recognition. The loads are controlled through the Triac Driver. A simple yet powerful program is written in assembly language and burned into the microcontroller to record and accept voice instructions and to control the devices. A 16 X 2 LCD with contrast control preset is provided for status display.
POWER SUPPLY:
The input to the circuit is applied from the regulated power supply. The ac. input i.e., 230V from the mains supply is step down by the transformer to 12V and is fed to a rectifier. The output obtained from the rectifier is a pulsating dc voltage. So in order to get a pure dc voltage, the output voltage from the rectifier is fed to a filter to remove any ac components present even after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc voltage.
Transformer:
Usually, DC voltages are required to operate various electronic equipment and these voltages are 5V, 9V or 12V. But these voltages cannot be obtained directly. Thus the a.c input available at the mains supply i.e., 230V is to be brought down to the required voltage level. This is done by a transformer. Thus, a step down transformer is employed to decrease the voltage to a required level.
Rectifier:
The output from the transformer is fed to the rectifier. It converts A.C. into pulsating D.C. The rectifier may be a half wave or a full wave rectifier. In this project, a bridge rectifier is used because of its merits like good stability and full wave rectification.
Filter:
Capacitive filter is used in this project. It removes the ripples from the output of rectifier and smoothens the D.C. Output received from this filter is constant until the mains voltage and load is maintained constant. However, if either of the two is varied, D.C. voltage received at this point changes. Therefore a regulator is applied at the output stage.
Voltage regulator:
As the name itself implies, it regulates the input applied to it. A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. In this project, power supply of 5V and 12V are required. In order to obtain these voltage levels, 7805 and 7812 voltage regulators are to be used.