when the robot reaches intersection it goes forward a bit , after that if the facing tile is white , robot will rotate 45 degrees and follow the line. If the facing tile is a black line robot will rotate 90 degrees and follow the line.
We used some coefficients in this function that we get from putting our sensors on the green color, using this coefficients in our program, robot will follow the line perfectly , this coefficients are different in our sensors. We put our center IR Sensor in third priority because if we wrote it in main priority it wouldn't be able to do next conditions. We made a function named "Time No Act" it works when robot follows a line and it 45 angel goes below degrees, in this function robot only goes forward until the tiles with under 45 degrees.
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