LEGO Education WebDo 2.0 Toolbox Manuel utilisateur

LEGO®Education WeDo 2.0

Toolbox

WeDo 2.0

Table ofContents

Build with WeDo 2.0

22-36

Program with WeDo 2.0

3-21

Programming is an important part of twenty-ﬁrst

century learning, and it is an essential part of all

WeDo2.0 projects.

It gives life to the models students have created

and teaches them computational thinking.

Program with

WeDo 2.0

Program with WeDo 2.0

The WeDo 2.0 projects will take you and your students on a journey of using

programming concepts to activate models and to create innovative solutions.

These programming concepts have been organised by function in the Design Library.

These instructions are provided to inspire your students as they look for solutions.

All of these functions can be used as described, or modiﬁed to suit a more

speciﬁc need.

Designing solutions with LEGO® programming blocks

Program with WeDo 2.0

When students want to bring their models to life, they will drag and drop blocks

onto the Programming Canvas. As they do this, your students will be creating

program strings. They can create multiple program strings on the canvas, but each

of the strings will need to begin with a Start Block.

Here are some important terms to know:

1. Start Block

A Start Block is required in order to start a program string in WeDo 2.0.

“Execute” means to start a series of actions until they are completed.

2. Programming Block

Programming blocks are used in WeDo 2.0 software to build a program string.

These blocks with symbols are used instead of text-based code.

3. Program String

A program string is a sequence of programming blocks.

The last block of the program string marks the end of the program.

Introduction to a WeDo 2.0 program string

Program with WeDo 2.0

When students explore programming for the ﬁrst time, they will probably line up as

many blocks as possible on the Programming Canvas. To carry out an idea they

have in mind, they will either arrange their blocks in a ﬂow so that they are

executed one after the other, or executed simultaneously.

Here are two important terms to know:

1. Linear Sequence

A linear sequence is when blocks are placed one after the other in a linear

fashion. The LEGO®Education WeDo 2.0 software will then execute one action

after the other in the order in which the blocks have been placed.

2. Parallel Sequence

A parallel sequence should be used when students want to perform two or

more actions simultaneously. In this case, the actions should be placed on

diﬀerent program strings and executed at the same time, using the various

techniques available in WeDo 2.0.

Suggestion

Tell your students to plan their programs in advance. This will help them when they

are deciding the order in which the program actions should take place. They could

use the Documentation tool to write the actions they wish to program, step-by-

step. They could also use a mind map of their own to decide whether they should

use a linear sequence or a parallel sequence.

Diﬀerent types of program strings

11 3 3 4

Program with WeDo 2.0

6. Conditions

Conditions are used by students in order to program actions that are to be

executed only under certain circumstances. Creating conditions within a

program means that some part of the program will never be executed if the

condition is never met. For example, if the Tilt Sensor is tilted left, the motor will

start, and if the sensor is tilted right, the motor will stop; if the Tilt Sensor never

tilts left, the motor will never start and if it never tilts right, then the motor will

never stop.

In developing program strings as part of their solutions, students will organize a

series of actions and structures that will make their models come to life.

Here are some of the simplest programming principles your students can use:

1. Output

Output is something that is controlled by the program the students are writing.

Examples of outputs for WeDo 2.0 are sounds, lights, display, and turning motors

on and oﬀ.

2. Input

Input is information that a computer or device receives. It can be inputted

through the use of sensors in the form of a numeric or text value. For example,

a sensor that detects or measures something (such as distance) converts that

value into a digital input signal so it can be used in a program.

3. Events (Wait for)

Students can tell their program to wait for something to happen before

continuing to execute the sequence of actions. Programs can wait for a speciﬁc

amount of time, or wait for something to be detected by a sensor.

4. Loop

Students can program actions to be repeated either forever or for a speciﬁc

length of time.

5. Functions

Functions are a group of actions that are to be used together in speciﬁc

situations.

For example, the group of blocks that could be used to make a light blink would

together be called, “the blink function”.

Programming principles

Program with WeDo 2.0

Program strings are designed for computers to understand, and pseudocode is

a way to explain a program so that people can understand it. Good pseudocode

respects program structures, but uses common words.

In WeDo 2.0, pseudocode can also be used to describe each step of a sequence.

There are no speciﬁc rules to follow when writing pseudocode, but you will see

that using a consistent structure will help you and your students while using it.

Example One

1. Start program

2. Start motor at power 1

3. Wait for 1 second

4. Stop motor

Example Two

1. Start program when “A” is pressed

2. Wait for Tilt Sensor to detect Shake

3. Start motor this way

4. Repeat steps 2 and 3 forever

Example Three

1. Start program when “A” is pressed

2. Wait for Tilt Sensor to detect No Tilt

3. Stop motor

4. Turn LED on colour 9 (red)

5. Repeat steps 2 to 4 forever

What is Pseudocode?

Program with WeDo 2.0

Description of ﬂow blocks

Start Block

When used, always placed at the beginning

of a program string. Press on it to start the

program string you have written.

Pseudocode: Start program

Start on Message Block

Always placed at the beginning of a program

string. It will wait for the correct message and

then start the program string you have written.

Pseudocode: Start program when receiving

message “abc”

Send Message

Sends a message to the Programming

Canvas. Every Start On Message Block

with the same message will be activated.

The message can be in the form of text

ornumbers.

Pseudocode: Send message “abc”

Wait For

Use this block to tell the program to wait for

something to happen. It can wait for a set

amount of time or for input from a sensor.

This block always requires input in order to

work properly.

Pseudocode: Wait for 1 second

Program with WeDo 2.0

Repeat Block

Use this block to repeat actions. Blocks

placed inside the Repeat Block will be

looped. This can also be called the “loop

block.” The loop can be repeated forever,

for a certain amount of time, or until

something happens.

Pseudocode: Repeat step ... forever

Start on Key Press Block

When used, always placed at the

beginning of a program string. Press on it,

or on the correct letter on the keyboard

to start the program string you have

written. All of the program strings with

the same letter will start at the same

time. To change the letter of activation,

long press on the block to get access to

thekeyboard.

Pseudocode: Start program on tap “A”

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