ABSTRACT:

The project is aimed to design a data logger system using which the physical parameters such as temperature, smoke, fire and light can be monitored. RF technology will be used in this project for wireless communication as it is reliable and can be applicable for long distance communication.

                  Here the wireless communication between the remote areas can 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 a temperature, fire, smoke and light sensors to an 8 bit microcontroller 8051, on the transmitter side. The temperature sensor will be interfaced to the controller through an ADC to convert the analog value sensed into the digital value. 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. Here an LCD will be interfaced to the controller to display the corresponding data regarding the status of the sensors    and a buzzer for an audio indication of any sensor activation.                               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

Smoke sensor

Fire sensor

Light sensor

Buzzer

RF transmitter

RF receiver

Power supply

Transformer                :           12V step down 

Filter                           :           1000uf/25V

Voltage Regulator      :           7805