If you have a very dark floor, then black tape might not give much contrast at all. If your floor is light colored, then black tape will likely work best as there will be good contrast for the line sensors between the floor and the line. The infrared line sensors are looking for reflections from the floor beneath the sensor, so the type of material used for the line will depend on your floor.
#LOGICBOTS CANT PLACE LINE SENSOR CODE#
You can correct for this slightly erratic behavior by accounting for a number of factors in robot construction and code including speed of the robot, tightness of the turns in the course to be followed, thickness of the line, distance between sensors, distance between drive wheels to sensors, and motor response time. The red lines above have been used to illustrate the path the robot’s wheels will take when driving only one motor at a time. The only problem with this behavior is that the robot will only drive in half circles to follow the line so it’s behavior may appear slightly erratic: This same behavior happens over and over, and the robot will follow the line. When the right sensor detects the line then stop the right motorīy stopping the motor on the same side that sensed the line, the motor on the opposite side will continue to drive, pushing the front of the robot back to the center of the line.When the left sensor detects the line then stop the left motor.The program to control a line following robot can be as simple as: How Do You Configure and Program Motors to Allow Line Following? Using two sensors is the most cost-effective way to make a robot reliably follow a line but continuing to add sensors can enhance the robot’s ability to follow a line quickly. This allows you to sense a larger area, so your robot can follow the line faster without getting lost. Adding a second sensor allows you to watch both sensors, and if either sees black, then turn away from the line. While this would technically work, your robot would have to move extremely slowly to avoid getting away from the line too quickly and getting lost.
If white was sensed by the line sensor, the current motor has driven you off the line, and the other motor needs to drive until you are back on the line. The sensor would need to be positioned directly above the line, and your robot would have to be programmed to drive one motor at a time. Your robot could follow a black line using only one IR line sensor. The robot can follow the path created by the tape without any intervention from the user, using only the IR line sensor input and a Python program. This can allow a robot to perform an activity referred to as “line following” where it can follow a black line, often created by using black electrical tape, on any light-colored surface.
#LOGICBOTS CANT PLACE LINE SENSOR FULL#
Sample lessons and full scope and sequences for all four levels can be found here.Īn infrared line sensor can be used to detect the difference between dark colors and light colors using infrared waves. The full Intro to Robotics course contains 72 detailed lessons including 225+ videos and 200+ projects and activities. In the final level, you will take all the skills you've learned and build a mobile robot of your own. Intro to Robotics consists of four levels that start at the beginning and systematically teach you to build circuits, use a Raspberry Pi, and write code in Python. This blog post on line sensors contains excerpts from Lesson B-12 and Lesson D-13 of our Intro to Robotics program.
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