This task will help to learn about and systematize one of the robot’s simplest functions: driving forward.
- Measuring sticks/meter sticks
- Tape to mark exact start and finish
- EV3 robot in base configuration as per the instruction booklet (no sensors or attachments are needed)
- Students will gain experiences with connecting the robot to the iPad (or another device), and downloading and running program.
- Students will learn how to program the robot to move forward.
- Students will gain a spatial sense of the proportion of wheel rotations and distance traveled.
Note for teachers
Different surfaces affect the robot’s driving: try to direct students to an even floor without much friction (carpet is not ideal)
This exercise can be used to practice measurement strategies, for instance lining up the measurement stick and the robot’s wheels – encourage students to use the robot’s white wheel holder
1 wheel rotation makes the robot travel approximately 17.6 cm
Decimal numbers are important in this exercise. Having a printout of a number line with decimals available will help students learn to use decimal numbers to program travel distances. Do not worry if you have not taught decimal numbers yet. Students can learn to use them quickly in this lesson.
Note: Language is important. Wheel rotations are a count – asking how many wheel rotations in most appropriate. Questions about the robot refer to a distance traveled – asking how far the robot travels is most appropriate
Move Forward Exercise 1
Drag a <Move Steering> block onto the programming chain. Notice that the number of wheel rotations is set to 1. Download your program by pressing play.
How far did your robot travel? Measure with a meter stick.
Hint: You can use the wheel holder to line up your robot.
On the meter stick, mark how far the robot travels with 1 rotation. Hint: Use tape and a pencil for marking.
Now, program the robot to move forward 2 wheel rotations. How far did your robot travel?
Estimate how how far will the robot move with 4 rotations?
Program your robot to move 4 rotations and measure how far it goes.
The kids in the photo estimated that the robot travels 72 cm with 3 rotations.
They put some tape on the floor.
Is their estimate correct? Will the robot travel 72 cm?