Abstract:
The aim of this project is to develop a multi purpose Transmitter and Receiver to
be used in Specialized applications such as infra red remote surveillance system, flood
detection, sound detection or any other use depending upon ingenuity of the user .The
final module made is ensured to be portable, small, flexible, inexpensive and power
efficient. It has been made keeping in view certain military considerations like less on air
time and immunity to the interference .For this purpose the FM is preferred over the AM
technique FM is less susceptible to the interference and noise .Also the signal to noise
ratio of FM is much greater than AM signal Further more to achieve greater flexibility
,we have used DTMF for identification of different transmitters. In this way we can use a
number of transmitters with one receiver. Receiver has been interfaced with computer
serial port. A small program in visual BASIC has been written in order to display the
area of activity.
The activity in any of the sensors shall activate the FM transmitter circuit, which
will send its identification code to the receiver using DTMF. The code will be interpreted
by the PC and indicated on the screen
