![]() So as a first key concept we need to keep the weight of the robot into consideration since less weight = more speed. Weight: If Force = Mass*Acceleration, it is pretty clear that with the same motors, meaning the same force, we need to decrease mass to get the most acceleration, which translates to the highest speed. Base: 3D printed design - Alternative: plastic, wood, cardboardīefore designing the robot and choosing its parts, it is very important to analize certain aspects of the robot to ensure we will get the most speed out of it.LiPo battery: 7.4v (2 cells) 450mAh, almost any brand is fine.Wheels: Pololu wide wheels - Alternative: Pololu thin wheels.Motor brackets: 3D printed motor brackets - Alternative: Pololu motor brackets. ![]() Something to make the base, I used 3d printing but it can easily be made with wood, plastic, cardboard or whichever material you have and think would work.8 push-up resistors (can be anything from 10k ohm to 100k ohm).LiPo battery of required voltage - Can be exchanged for regular batteries.Some screws to hold things together - 1/8 inch or less if you want them to be able to hold the Arduino.PCB etching tools and materials - Can be replaced with a breadboard but will take up more space.The competitions I go to have a 2cm line width of white over black and also have small horizontal lines at the start and end of every straight section for the robot to detect and change speeds taking advantage of the straight path. The race track can be either a black line on a white background or the other way around. My robot, called Yeti, is almost 12cm wide and 20cm long, which are the competitions limits in my country, and the cost was aproximately 75 US dollars, but the price might be different for you depending on what components you choose. Nonethless, every or almost every aspect of this robot can be modified to adjust for the needs, skills or budget of the maker. The original objective of this robot was to take it to competitions where it would race against other robots, so my design always focused in achieving the highest speed while conforming to the rules of the competitions. This type of robot is very popular and can be used to teach some very powerful physics, electronics and programing skills and concepts while still being very fun and simple to make. ![]() Hey! In this Instructable you will learn how to make a line follower robot, made to follow a race track as fast as possible.
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