If you have a very long program, where you have programed the left motor to execute over 100 different actions, how would you change that program if you were to change the motor port? Would you traverse the code and change the port on each of those 100 lines?
To evade such a situation, variables have the ability to store objects. Here's how this helps you:
An example of an object is the motor you are using. Let's look at how a program that moves both motors would look if we extracted the ports into variables named "left_motor" and "right_motor":
# Create your objects here. ev3 = EV3Brick() left_motor = Motor(Port.B) right_motor = Motor(Port.C) # Write your program here. left_motor.run_time(500, 3000, Stop.COAST, False) right_motor.run_time(500, 3000, Stop.COAST)
Notice that the "run_time" commands can be called from the "left_motor" and "right_motor" variables. Now if we wish to change the actual port of the left motor, all we have to do is change the variable at the beginning of our program:
# Create your objects here. ev3 = EV3Brick() left_motor = Motor(Port.D) right_motor = Motor(Port.C) # Write your program here. left_motor.run_time(500, 3000, Stop.COAST, False) right_motor.run_time(500, 3000, Stop.COAST)
Other examples of objects can be the sensors you use or devices such as the microphone in the LEGO controler
This Tutorial is used in the following courses and lessons
The course introduces students to the programming language Python. We use LEGO Mindstorms EV3 Robots. Python is a popular programming language. It could be used for introducing students to programming, for academic studies, for developing machine learning algorithms and as a general-purpose language.
During the course, students learn how to read and how to develop Python programs. They use an Integrated Development Environment called Visual Studio Code. Robots are programmed to perform interesting and funny tasks like "bringing you water". The level ends with competition on a playing field with boxes.
Today we will encounter a significant problem our engineers have had to face ever since a man has had to step on the Moon, namely sending robots to the Moon. When we add something to a rocket that has to reach the Moon, you can imagine how many things need to be carefully calculated.
From the position of the rocket to the center of mass, to the momentum of the rocket and many other things. This is why when scientists wish to send a robot to the moon, they have to make a lot of compromises with its construction.
After the deployment of Moon Rover 2 to the Moon, scientists began working on a robot to deploy with the next Moon Rover. For this purpose, the robot needs to fit into the remaining space on the rover. This space is not in a standard shape, so the robot will have to have an irregular shape as well.
The plan is for it to be mounted on to the Moon Rover and when the vehicle is deployed from the rocket, the robot will disengage and will maneuver away before the astronauts proceed to drive it.
