mBot
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Once you have the line follower communicating its current 'state' into a variable, it can be helpful to investigate what the four different states that the line follower can be. In state "0", the line follower is directly over top of the line. In state "1", the line follower is too far to the right and you will need to code the mBot to move more to the left. In state "2", the line follower is too far to the left and you will need to code the mBot to move more to the right. In state "3", the line follower is not over top of the line at all, and you will need to code the mBot to move backwards.
