LESSON 8: LINE FOLLOWING - FLL...
Transcript of LESSON 8: LINE FOLLOWING - FLL...
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LESSON 8: LINE FOLLOWING
SESHAN BROTHERS
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WHY IS LINE FOLLOWING IMPORTANT?
• No matter what season of FIRST LEGO League you are competing in, you will find that the challenge mat has lines
• Lines can help you navigate to the far end of the board reliably
• Lines can help you get to a mission model
• Learning to line follow is crucial in FIRST LEGO League
© 2018, FLL Tutorials, Last Edit 9/16/2018
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HANDLING COLORED LINES
¡ In some seasons, FIRST LEGO League mats have had colored lines
¡ Problem: Colored lines on the mat are sometimes not LEGO colors, meaning they are hard to detect in color mode. In addition, in reflected light mode, the red reads a very high value making it not distinguishable from white. This is because the color sensor shines a red light.
¡ Solution: Color mode works reliably for detecting the red on the mat so color mode can be used. For the green, only reflected light will work on it because it reads a low value that is almost black.
© 2018, FLL Tutorials, Last Edit 9/16/2018
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FINDING USEFUL LINES
¡ Lines often are designed to go to a mission model and help you navigate
¡ If you line follow with your color sensors, you will be where you need to be
¡ Look for useful lines to follow
© 2018, FLL Tutorials, Last Edit 9/16/2018
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NOT-SO-USEFUL LINES
¡ Sometimes, lines are too close to a mission model to line follow
¡ Therefore, you would have to apply other techniques
¡ You don’t have to line follow on every line
© 2018, FLL Tutorials, Last Edit 9/16/2018
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TIPS FOR LINE FOLLOWING
¡ Make sure you are actually on the line before you line follow1. Move Until the Line2. Turn a bit to become straight to the line
© 2018, FLL Tutorials, Last Edit 9/16/2018
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NEXT STEPS
¡Complete the line following lessons on EV3Lessons.com¡ Beginner: Basic Line Follower
¡ Intermediate: Color Line Follower
¡ Advanced: Proportional Line Follower
© 2018, FLL Tutorials, Last Edit 9/16/2018
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CREDITS
• This tutorial was created by Sanjay Seshan and Arvind Seshan
• More lessons at www.ev3lessons.com and www.flltutorials.com
© 2018, FLL Tutorials, Last Edit 9/16/2018
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.