BLIND PEOPLE PATH FINDER USING ULTRASONIC SENSOR

Published Thursday 6 October 2011 by gk in  


BLIND PEOPLE PATH FINDER USING ULTRASONIC SENSOR
INTRODUCTION:
                The objective of this project is to give the alarm for blind people using ultra sonic technology.

SCOPE OF THE PROJECT:
            This project is very useful in blind people to indicate the alarm for avoiding accident.
 EXPLANATION:

                         This project is designed by following blocks

Ø  Micro controller
Ø  Ultrasonic transmitter
Ø  Ultrasonic receiver
Ø  Amplifier
Ø  Signal conditioning unit
Ø  Driver circuit with alarm

        In this project microcontroller AT89C2051 is used to as oscillator to generate the 40KHZ frequency signal. Then the generated frequency signal is given to ultrasonic transmitter.
        The ultrasonic transmitter is constructed with two inverted buffer is connected in parallel. Depending on the frequency the buffer on and off time is varied. Through this way 40KHZ ultrasonic wave is generated and transmitted.
          The ultrasonic wave is hit the nearest object and reflected from the object. The ultrasonic receiver is used to receive the reflected wave. Depends upon the distance of the object the received wave strength is varied.  The received signal is given to amplifier unit. The amplifier unit is constructed with the operational amplifier which acts as power amplifier. The received signal wave is in the form of AC wave form so the amplified signal is given to signal conditioning unit. The signal conditioning unit consists of precision rectifier and comparator. The precision rectifier is also constructed with operational amplifier in which the negative signals are rectified. Then the rectified signal is given to comparator. The comparator is used to generate the square pulse. The square pulse is given to driver circuit. The driver circuit is constructed with transistor which acts as switch to turn ON and turn OFF the alarm.
The ultrasonic transmitter & receiver are fixed in front of the walking stick. The transmitter transmits the ray towards receiver. According to the distance the transmitting pulse has been changed. From this, the microcontroller monitors the distance between the object and the stick. So if he walks near the wall or any object. The alarm makes the sound for to indicate the blind people to stop or change the path.
ADVANTAGE:
      • Low cost
      • Path finder
      • Easy to implement
      • Security
      • Less weight

APPLICATION:
                      This project is very useful for blind peoples.









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4 comments:

  1. Chandrapal Singh Makwana 29 October 2014 at 02:19

    Sir , i want ppt on this topic .

     
  2. teklit 24 May 2016 at 15:06

    sir i want code for this project

     
  3. Unknown 8 January 2017 at 04:01

    Sir i want ppt of this project
    varaprasad4094@gmail.com

     
  4. Alimeti 4 December 2017 at 18:00

    Sir i want ppt of this project
    emmanuelmgaya93@gmail.com

     

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