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When your robot follows a line, it is actually following an EDGE between light and dark.
When it senses the light (greater reflection from the surface), it must turn toward the dark - in this case LEFT.
When it senses dark (less reflection from the surface), it must turn toward the light - in this case RIGHT.
In this way, it "waddles" along the edge. The smaller you make the turns, the smoother its pathway will be.
This is a good, simple line follow program.
This one works as well.
One more.
There are other ways to do a line follow. You are not limited to these codes.
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