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Are the IR sensors used in Line following Robot and Obstacle avoidance Robot with Arduino UNO different ? If yes , where do we buy these parts online ? I used the following sensor in my Line Follower and am not getting result as it’s detecting obstacle instead of black line .

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The sensor you have used is fine. To make an effective line following robot you need at least 2-3 sensors.

Here is one using 2 LEDs either side of the line:
2 sensor robot

And here is a 3 sensor robot:
3 sensor robot
Notice that one LED stays on the line.

And finally a 5 sensor robot:
5 sensor robot

The following websites have good step by step guides where they explain the various techniques:

When I made my line following robot I used 2 of the following sensor:
IR sensor

These sensors were great as they pointed in towards each other, making a focal point. You can do this to your sensor by bending the LEDs slightly towards each other.

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