Written Directions for EV3 Line Follow (Heaviside Algorithm) Description: Given a black line and the light sensor on the EV3 robot, we want to have the light
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Written Directions for EV3 Line Follow (Heaviside Algorithm) Description: Given a black line and the light sensor on the EV3 robot, we want to have the light
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Written Directions for EV3 Line Follow (Heaviside Algorithm)
Description:
Given a black line and the light sensor on the EV3 robot, we want to have the light sensor read values
from the reflected light. When the values read dark, we will direct the robot to turn right. When the
light values read light, we direct the robot to turn left. A graph representing this action would look like:
These directions are written for a two motor robot with Left wheel assigned to C and Right wheel assigned to B. The light sensor should be mounted in front, pointing down and centered between the wheels. The robotsquare.com website has plans for the Educator Robot at http://robotsquare.com/wp content/uploads/2013/10/45544_educator.pdf. This design would work with these directions.Light > threshold: Turn Left
Light < threshold: Turn Right
Procedure:
The Pseudo Code for the program is as follows:
threshold = 40; w hile (true) { if (SensorValue[light] < threshold) { motor[left] = 30; motor[right] = 0; else { motor[left] = 0; motor[right] = 30;1. Start the EV3 software. (Double click the EV3 icon)
2. Select "File-New Project"
3. Save the Project as "Line Follow Tutorial"
4. Note the "Program" Tab - this is where we will write the "main method" of our program. (EV3
Projects can have multiple 'tabs' or program files.)5. We need a 'while (true)' statement. This is a loop that will continue forever (at least while the
program and robot is on). Click on the Orange block tab and drag a loop block into the programarea. Note the infinity icon in the block. This is the loop condition (infinity being forever). Any
icon in a block can be clicked and changed to set the properties of the block. (Like count, sensor, logic . . . for loop condition).