This project is developed for blind peoples to find out the obstacles in front of them by using radar technique. The main modules in this project are Infrared transmitter, Infrared receiver, Microcontroller unit and audio section. An Infrared signal is produced by using the electronic circuit. The Infrared produced is transmitted along a particular direction. The Infrared signal travels and falls on the Obstacles and reflected back. In the electronic circuit, there is an Infrared receiver. The reflected Infrared signal can be received through the receiver. The microcontroller counts the time taken between the transmission and the reception and thus calculates the distance. If there are obstacles in front of them, it produces a warning signal. Thus the user can easily identify the obstacles in front of him. This project is very useful for blinds.

Abstract

This project is developed for the users to track student’s information through cellphone/telephone. It mainly consists of DTMF decoder, Microcontroller unit and PC. When the user makes a call to the particular number, the unit prompts the user to enter the register number. The user has to enter the register number through the telephone keypad. The DTMF to BCD converter converts the code and the microcontroller analyses the signal and sends to the PC through RS232 and serial port. The PC searches the correct data for the particular number and replies the details. The details are sent through the cellphone/telephone line so that the user can hear it. The unit then prompts the user whether to continue or not. This system is fully automatic and it is very easy for the users since it uses voice reply. The design and port programs are written in Visual Basic. The Microcontroller program is written in assembly language. The microcontroller used is PIC 16F73.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM