Variables

Variable it's a location in the memory of the EV3 Brick that can store a data value.

In other words, they are like magical boxes that hold different kinds of information, and you can use them to make your robot do all sorts of amazing things!

How to make a variable?

1- Press "Make a variable"

2- Name your "variable"

3- You can see that you have the variable you named.

You can make as many variables as you need.

Build the entire robot by:

If you have not done so

Variable + Operator + Gyro Sensor

1- Set "theNumber" variable to 100

2- Repeat "theNumber" is less than the gyro Sensor

3- Motors make a Pivot turn to the right

4- Until"100 degrees" is less than the gyro Sensor (sensor already turn 100 degrees).

5- Stop moving

This is a different robot from Exploration 2. So don't worry if it moves different from yours.

Repeat Variable 5 times

Notice that this gif/video is speed up.

1- Set "counting" variable to "5"

2- Repeat "5 times"

3- Motors making a 360 degrees spin turn at the speed of 50%

4- "counting" add 1, inside the loop

5- The loop run for 5 times. Stop moving

Variables 2 ways of making the robot repeat movement

And:

The video/gif it's x4 speed.

"Repeat"

This is a different robot: way-2 exploration. So don't worry if it moves differently.

1- Set "counting" variable to "5"

2- Repeat "5 time"s

3- Motors making a 360 degrees spin turn at the speed of 50%

4- "counting" add 1, inside the loop

5- Wait for 1 second

6- The loop run for 5 times. condition is met. Stop moving

"Repeat Until"

1- Set "counting" variable to 0

2- Repeat "counting" is EQUAL to 4

3- Motors make 360 degrees spin turn at the speed of 50%

4- Until"counting" is MORE than 4.

5- Wait for 1 second

6- Stop moving

Display the variable

The number starts counting from 1 (since you set it to "set CountinNumber to 1")

1- Set variable "CountingNumber" to 1

2- Repeat 10 times:

3- Display [together]"Number" and variable "CountingNumber" at line of "CountingNumber"

4- Change "CountingNumber" by 1 (add one everytime it run the loop)

Observations: Why is variable important for programming?

-> Remember Things: Just like we use notebooks to remember important information, variables help the robot remember things it needs to know.
-> Make Decisions: With variables, the robot can decide what to do based on what it "knows". For example, if it senses that it's too close to a wall, it can decide to turn away to avoid crashing.
-> Be Flexible: allow the robot to be flexible and adapt to different situations. If it needs to move faster, we can change the variable for speed.
If it needs to stop after a certain distance, we can adjust another variable.
-> Solve Problems: By using variables to store information and make decisions, the robot can solve problems on its own. For example, it can navigate through a maze, avoiding obstacles along the way.

Time for a quiz!

Question goes here

Challenge for you

Hint:

-> Variable name: CountingNumber.

-> Use "Repeat" block for 10 times.

Notice it's the same as the Display Variable shown above!