EV3 Phi. Teacher's note - Break at the End option in EV3-G for Mindstorms move block
Let's cover the break at end option and learn why there is no lesson about it to students.
- #409
- 17 Apr 2017
Let's cover the break at end option and learn why there is no lesson about it to students.
In this tutorial, we add another mission to our current program. This mission is - hanging the Gecko from the FIRST LEGO League Animal Allies.
We will demonstrate with a robot what the acceleration is and the effects of high and low acceleration.
What should you as a teacher know when the students are trying to achieve a program and robot attachment that could reproduce their behaviour 9 out of 10 times.
We will explain inertia non-scientifically so that we make it easy to understand concept.
How to control the speed of the motors and the speed of the robot.
With the last few videos, we entered the math world. Why we do it and what to keep in mind
The task in this tutorial is to execute the program 10 times and to do it yourself. If you have your attachment then use it. If you have our attachment then use it. But execute the program 10 times and make sure that it works.
How to use the robot when the buttons are not accessible.
How great is the great attachment for lifting that we built in this course? How many times can it lift the robot without making an error? How great are your attachments and how could you test them? - the answer is simple. Just try 10 times and they should work at least 9 of them as our attachment is.
In this video, we introduce two pieces: beam with pins and the angular beam with pins
If you've done the calculation following the previous tutorials you would arrive at a result of 18.75 rotations. But this is not the correct answer. The calculation is wrong, because the math model that we've built, although kind of obvious, is not correct. When experimenting the correct number of rotations would be 37.5. This is a large difference. Two times larger. Exactly two times large. Something should be happening here - and this thing is "planetary mechanism"
How to change the direction of a beam from horizontal to vertical.
This is a teacher's note about the math behind calculating gear ratios with for our lifting attachment. It math model we build in previous tutorials is not exactly correct and here is the explanation why.
Connect the attachment to the box robot and find the correct number of rotations of the middle motor that would bring the robot up and forward and would attach it to the mission model.
How to place the cup on the robot so that the challenge is challenging.
Sometimes the answer that you get by calculating seems not to be right. Is it the calculation that is wrong. Probably it is not the calculation, but something is happening with the robot.
Try to solve the challenge of this module and observe the cup.
In the previous video, we found the correct answer for our task and it is 18.75, or is it?
What should you do as a teacher when the students are calculating the gear ratios and number of needed rotations?
Robots could do chores for us and they must consider the load of the cargo or the robot could be damaged.
Calculate the number of rotations you have to do with the motor to rotate the final small 8 teeth driving gear wheel to 1.25 rotations?
We calculate the number of rotatios when a gear system is involved. The driving wheel will have to do a number of rotations for the driven wheel to rotate to a desired number of degrees. In our specific case when the driven gear wheel is rotate to about 90 degrees the legs will lift the robot.
Let us do a quick recap of the whole lifting mission and its solution
Note for the teacher on making the construction more stable, more durable and using beams for this.