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- #1075
- 08 Feb 2019
In the tasks above we have tried to steal the phone without changing the weight the sensor measures and still we managed to replace the exhibit. You must have seen in movies that land mines follow exactly the same principle. If someone steps on a land mine, it will activate only after they remove their foot or press the mine harder.
If you like, you can show your students pictures of war scenes or children injured by land mines. War is something terrible. It is not only spectacular explosions in movies or colorful pixels on PC games.
[a picture of disabled children with artificial limbs]
A teacher’s story:
There was an 11-year-old student who used to claim that even if he had been injured in the arm, he would have moved the machine gun to his other arm and continued firing. Then I went to him and gave him a strong pinch. The student put his both hands on the spot after which I asked him whether he was still so sure about what he had just said.
Courses and lessons with this Tutorial
This Tutorial is used in the following courses and lessons
Robotics with LEGO - Level 3.0 - Security systems
This is the fifth level of the Robotics with LEGO curriculum for students in fifth to twelfth grades.
In this level students will learn how to work with data measured by the sensors. The concept of Algorithm is introduced and the programs perform calculations without knowing the values beforehand. The programming blocks transfer data between each other via data wires. The robots are designed to address the problems of security systems. Variety of alarm systems are built and the physical principles of different security methods are considered.
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Lesson 2 - Weighing security stand
Weighing plate, using weight change block
The sensor of the robot from the previous lesson was binary. This means there was only one state possible – either there is an object or there is no object. Therefore, it was very easy to press the plate, take the exhibit and put a stone instead. And the system could not detect us anyway. That is why now we have to think of something better in order to protect the valuable exhibits.
A clever solution is to have a robot which “senses” each change in weight. If the weight is greater, this will mean there is someone pressing the plate and the system should trigger the alarm. If the weight becomes lower, this will mean someone has stolen the exhibit and the alarm should also go off.
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