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Although it is one of the classics of robotics for beginners, the line follower robot, made at high level, is quite complex. On Youtube you can see line follower running at 3 m / s and more, with optimization and maximum performance research that achieves discrete levels. Usually a line follower competition is based on pure speed and the path is quite linear and simple, with large curves and wide straights. In this case the hardware part is the most important, because the sw part is quite simple ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/microbo-t-advanced-line-follower