ABSTRACT:

The project is aimed to design a wireless communication system using which The safe switching of high voltage devices can be achieved. RF technology of wireless communication will be used to implement the project as it is reliable and can be applicable for long distance communication.

                      In industries, there will be various loads to be at some specific intervals according to our requirements and also based on the device’s constraints. For these purposes, a person should be employed to monitor the status of the loads. But there may be chances that the person may forget to operate ,  and also it is not an easy task for a person to operate these loads manually as these loads run with high voltages. This project gives the best solution for   these problems.

 Here in this project, the wireless communication between the remote areas will be achieved by using the RF modules called RF transmitter and RF receiver. The project is designed in such a way that we will interface four switches to an 8 bit microcontroller 8051 to control the various loads which will be connected on the receiver side. And the RF transmitter is also interfaced to the controller through an RF encoder to encode the data received by the controller. Hence the encoded data will be transmitted by the transmitter over the medium and will be received by the RF receiver which will be interfaced to the controller through an RF decoder, on the receiver side. The RF decoder is used to decode the received data into a 4 bit digital data which will be fed to the controller. So now the controller will perform the predefined tasks by monitoring the received decoded data. The loads which have to be operated will be interfaced to the controller through relays. And these loads will be turn ON/OFF  based on the ON/OFF conditions off the switches on the transmitter side. An LCD will also be provided to display the status of the loads.

This project is not only limited to industrial applications but can also be extended to domestic purposes as home appliances controlling using RF. The home appliances can be switched on/off using this RF concept without actually going near the switch boards or regulators.

            This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Full wave bridge rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

LCD                            :           HD44780

RF transmitter

RF receiver

Switches

AC loads

Relays

Power supply

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805

SOFTWARE :

Keil microvision

proteus

UC flash

APPLICATIONS: Industrial applications