How will you make a line follower robot without a microcontroller? Will you use a 555 or a combination of some gate ICs?

 

How will you make a line follower robot without a microcontroller? ...

With great care. They can be dangerous.

 

there are million ways to do that. simple solution is to use sensor that can detect line. if sensor sees the line, motor on that side need to slow down or stop. so two such circuits will continuously keep on adjusting speed of their motor while moving forward.




if the line is sufficiently wide, single sensor can be used. this will follow the edge:

 

How will you make a line follower robot without a microcontroller? Will you use a 555 or a combination of some gate ICs?

You are suggesting solutions without identifying the problem.