In the previous task we saw how difficult it is to reach the goal without knowing where the starting point is. This is a very important lesson. The starting position of the robot is of utmost importance for the successful accomplishment of the tasks. Today’s robot is no exception.
- #1040
- 03 Jan 2019
You might have noticed that your robots have a color wheel at the front and a color sensor at the back. We will use the color sensor “to hear” the color from the robot behind. Then, we will use the color wheel to “whisper” the color to the color sensor of the robot in front and so on.
For that purpose, you should choose the starting position of the color wheel. This will be a color which will always be oriented upward. Thus, we will know how much we should rotate the medium motor in order to reach the desired color.
It is important to choose the starting position of our robot in the beginning and make sure we always start the robots from the same position.
After you choose which color you will use as a starting position, set the degrees you will turn the medium motor for each of the colors.
Courses and lessons with this Tutorial
This Tutorial is used in the following courses and lessons

Robotics with LEGO - Level 2.0 - Robots in Factories
The third level of the Robotics with LEGO curriculum for students from fifth to twelfth grades.
Robots in this level use two or three sensors at a time and students create more complex programs for them. The work of the differential and its usage in vehicles with one drive motor is explored. Robots interact with each other and transfer information or material between themselves. Students learn in depth how to create smoother line-following programs. In the end of the workday, robots leave the conveyor belt and relax with a recreational game of volleyball.
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- 15:01
- 129

Lesson 3 - Telephone game
The Telephone game is played with 2 or more robots and is extremely funny. Each robot has a color wheel that can be rotated through the medium motor and a color sensor. The first robot on the left rotates the color wheel to a random color. The second robot must detect the color on the wheel and rotate its color wheel to this color. The third detects the color wheel of the second and so on.
It is described in details in Lesson 4 of Level C2. Cooperation
- 9
- 5
- 21
- 3d_rotation 1

Level C2. "Cooperation". Robotics with LEGO
The sixth level of the Robotics with LEGO curriculum for students in third or fourth grade.
For the first time two different robots are required to solve a challenge. Students learn how to cooperate and find a common approach to the challenges and how to distribute their roles. Various robots are built, even a crane that loads a truck. Students use two sensors at the same time so that they find their target and find out whether their partner-robot is ready with their part of the challenge.
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- 6:39
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Lesson 4 - Telephone game
The Telephone game is played with 2 or more robots and is extremely funny. Each robot has a color wheel that can be rotated through the medium motor and a color sensor. The first robot on the left rotates the color wheel to a random color. The second robot must detect the color on the wheel and rotate its color wheel to this color. The third detects the color wheel of the second and so on.
It is described in details in Lesson 4 of Level C2. Cooperation
- 9
- 5
- 19
- 3d_rotation 1