Line following Robot with out using Microcontroller

Line following robot is the basic project in Robotics field. there are so many ways to do line following robot project. Here i am proving one simple design to do line following robot as well as obstacle detector in single project without using Microcontroller & no need of any programming also.

-> Components needed for this project:
     1) L293D Motor Driver IC
     2) 7404 IC ( NOT gate )
     3) 7805 IC ( Voltage Regulator )
     4) IR Tx-Rx Modules  - 3
     5) 12v dc motors        - 2
     6) Motor wheels         - 2
     7) 12v power supply battery



-> Circuit diagram :

For IR sensor module 3 pins will be there, they are
           1) Vcc
           2) Ground
           3) Output

The IR sensor modules are available in market you can buy them or if you want to use low cost IR sensor module you can get the circuit diagram and others details from my post "Simple IR sensor circuit".
you can make use of this for this project.

->Working:

    In this project i am using 3 IR sensor pairs among these 2 are used to follow the line and another sensor is front sensor.this sensor is used for detection of any obstacles present in its way. if any obstacles present this robot stops moving.if nothing is there in it's way it will continue to move in it's path.


-> for step by step procedure to make this circuit and demo of this project watch the following link....

     https://www.youtube.com/watch?v=eGyaKs0THdw

Thank you..