Let's code the robot to follow the line

Let's now start coding this line-following robot. There are various line-following techniques, such as two-state, five-state, proportional, and proportional integral derivative. In this chapter, you will be learning the easiest yet most accurate technique – the two-state line follow. You will be using the if-else programming block from the Control pallet. For line-following robots, it is necessary to have the right environment, including the following:

• A plain white background
• A properly etched black line
• Controlled lighting conditions

Remember one thing. The robot always follows the edge of the line and not the center. Wondering why? This is because, if the robot follows the center of the line, it will miss the turns and leave the line, but if it is following the edge, it will never ever miss the turns/curves. The algorithm for two-state line following is simple – if the robot senses black, turn...