Ai turning2 - Beginner

BASIC TURNING
BEGINNER
PROGRAMMING
LESSON

Lesson Objectives
1. Learn to turn the robot a desired number of degrees
2. Learn the differences between Spin and Pivot Turns
3. Learn how to program two different type of turns
4. Learn to write pseudocode
COPYRIGHT © EV3LESSONS.COM 2015 (LAST EDIT: 7/07/2016) 2

PIVOT Vs. SPIN Turns
180 Degree Pivot Turn
180 Degree Spin Turn
Notice where the robot
ends in both pictures after a
180 degree turn.
In the Spin Turn, the robot
moves a lot less and that
makes Spin Turns are great
for tight positions. Spin
turns tend to be a bit faster
but also a little less
accurate.
So when you need to make
turns, you should decide
which turn is best for you!
B
C
Start Position End Position
Motors
B and C
Move
B
C
Motor
B Moves
Start Position
End PositionB
C
B
C

How to Make Pivot and Spin turns
Steering Value
50 -50 100 -100
Pivot Turn Right Pivot Turn Left Spin Turn Right Spin Turn Left
Change Steering value here
B
C
B
C
B
C
B
C
Move Steering
Block

MAKING A Pivot turn for 90
DEGREES
Program your robot to turn 90 degrees....Does the robot
actually turn 90 degrees if you just pick 90 degrees for
distance?
B
C
B
C
?
Ans. NO! Solution on next
page

how do you make the robot turn
90 degrees?
Ans. Try using the port view to measure the
turn and then input the correct number of
degrees.

TEACHER INSTRUCTIONS
• Split up class into groups as needed
• Give each team a copy of the Turning Challenge Worksheet
• Challenge Details are on Slide 8
• Discussion Page Slide 9
• Challenge Solution on Slide 10

TURNING CHALLENGES
Challenge 2
• Your robot baseball player must run
to second base, turn around and
come back to first.
• Go straight. Turn 180 degrees and
return to the same spot.
Challenge 1
• Your robot is a baseball player who
has to run to all the bases and go
back to home plate.
• Can you program your robot to
move forward and then turn left?
• Use a square box or tape
Start and
End
position
First
Base
B
C
Second
Base

CLASS Discussion GUIDE
Did you try PIVOT and SPIN turns? What did you discover?
Pivot turns were fine for Challenge 1, but for Challenge 2, if we used Pivot turns, we
were farther away from the base.
What situations would one work better than the other?
Spin turns are better for tight turns (places where there is not enough space) and you
stay closer to your original position.
What is PSEUDOCODE? Why do you think programmers find it useful?
(pseudocode is from the worksheet)
Pseudocode allows programmers to write out their code in plain English before you
code in a programming language. It lets you plan and think before you sit down to
code. It lets you share your ideas with others you are working with in a common
language.

CHALLENGE SOLUTIONS
Challenge 2
You probably used a spin turn because
it is better for tighter turns and gets
you closer to the starting point!
Challenge 1
You probably used a combination of
move steering to go straight and do
pivot turns to go around the box.
Start and
End
position
First
Base
B
C
Second
Base

Ai turning2 - Beginner

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