ABSTRACT:

This Project describes a design of an effective temperature monitoring system by using RF technology of wireless communication.

                     Here the wireless communication between the remote areas takes place by using the RF modules called RF transmitter and RF receiver. The project is designed in such a way that we the temperature sensor to the microcontroller at the transmitter side using which we can monitor the temperature continuously. Here the temperature sensor will be interfaced to the controller through an ADC to convert the analog value to the digital as it will be fed to the controller. And the RF transmitter will also be interfaced to the controller through an RF encoder HT12E using which the 4 bit data receives by the controller will be encoded into a single line data and will be transmitted by the transmitter through the antenna. And at the receiver side , the RF receiver will be interfaced to the microcontroller via an RF decoder HT12D. So the transmitted data from the transmitter will be received by the RF receiver and will be decoded into a 4 bit digital data which will be fed to the controller, and the controller performs the pre defined tasks by monitoring the received data. The controller will be programmed in such a way that it alerts the buzzer , if the sensed temperature crosses the preset value. A buzzer interfaces to the controller gives an audio indication of over temperature and an LCD will also be provided to display the value of temperature. Here we use the RF modules of range 100meters, in our project                          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

ADC                            :           ADC0804

LCD                            :           HD44780

Temperature sensor    :           LM35

RF transmitter

RF receiver

Buzzer

Power supply

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805

SOFTWARE :

Keil microvision

proteus

UC flash

APPLICATIONS: Industrial applications