Line Following Snack Serving Robot
Published on March 11, 2015
A robot built with littleBits that follows a drawn line and serves treats from the snack bowl mounted on top.
How it works:
The Line Following Snack Serving Robot is a robot made with littleBits that does exactly that, serve delicious snacks along a path drawn by the maker. This project requires no programming.
The robot has two DC motors controlled by a respective light sensor. The bright LEDs illuminate the surface below the robot and more light reflects from the floor surface than from the drawn line. When the bright LED shines on the floor, more light reflects into the light sensor telling the DC motor to turn fast. When the bright LED shines on the drawn line, less light reflects into the light sensor telling the DC motor to turn slowly. Each light sensor controls its respective DC motor in effect steering the robot along the drawn black line.
The inspiration for this project came from one of our active users on the project’s portion of our website, Yoo-bin Lee. She created the original littleBits line follower robot in December of 2013.
Credits: Sean Schumer
How To Make It
-- On the underside of your robot, turn the sensitivity down on each light sensor and test again. This will slow your robot down but will let you know if it’s able to navigate your path.
-- Does your robot drive off the path at specific points? If so, the path may be too sharp of an angle, or you may have bright lights in your area creating glares on the surface. Try turning off these lights.
-- If all suggestions don’t seem to help, it may be worth building some blinders for your bright LED and light sensor. You can use any stiff material you have around. Cardboard is easiest to work with. We used scrap acrylic. Lining the inside of the blinders with black electrical tape will cut down on light reflections.
-- In addition to building blinders, a skirt for the entire robot will help block out more ambient light. Construction paper worked well here.