Tips and tricks for FIRST LEGO League (FLL) 2020 RePLAY Challenge

Although all of the uncertainty around the new season, the new challenge is released and we have once again prepared for you a quick reference that you can use as a starting point for solving the missions. As each year we are not releasing any "solutions" until the season ends. The page aims at providing ideas you could learn from and develop your own solutions to the missions. When you do, send us some pictures and videos :)

Approach

What we could do as mentors, is to help with directions and questions based on experience and tutorials from previous years. We plan to update the page a few more times during the season, so check for updates from time to time.

Prerequisites

Move through the FIRST LEGO League Robot Game Preparation. The complete guide before proceeding to the resources below. This will give you a much deeper and better understanding of the references that we are making

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With a subscription for all the team members, students could move together through the courses, building instructions and programs while the mentor tracks the programs and navigates them.

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Missions Inspiration and Directions

Fllcasts tip:

Always try to accomplish this mission. If you are not able to achieve this mission, try to drop an attachment which achieves less points than 25. It is easier to achieve 25 points by doing nothing than to achieve 25 points by accomplishing a mission.

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Fllcasts Tip:

The difference is not that much if you push a small or a larger model. That is why try to make sure your Innovation Project covers all of the scoring requirements. In the same time try to make your life easier by building a sturdy model that has a flat surface, so that it is easier to be pushed or has an appropriate form to be carried if you decide to carry the model instead of pushing it.

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Fllcasts Tip:

The easiest way, probably, would be to use the robot and push on the lever until it reaches the blue section. You can use the color sensor to navigate your robot and the wall to align. Note that if your robot goes too fast, the model may jam.

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The figure at the top can be just pushed with a simple passive attachment, while the robot passes the mission model. You just need to attach it high enough. However, for the second figure you will need to have an active attachment that pushes it upwards until it reaches the top. This can be quite easily solved with some of the box robots with XY mechanism. You need to be careful, where the slide figures fall as it may prove difficult to collect them and bring them pack to base. You can try to put one of the figures on top of the heavy tire, just remember to do it after you have flipped the tire.

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Fllcasts Tip:

It is not necessary to accomplish the whole mission at once, but is preferred as going multiple times to the mission model can be time consuming. A good approach is to have a self aligning attachment that drops the cubes. The XY mechanism can be prove handy once again as the movement necessary for flatting the bench and removing the backrest are easily achievable with it. Note that it is not needed to take the backrest back in base, so you can just leave it on the field. Just put it somewhere where it would not interfere with your robot later on.

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Fllcasts Tip:

The first part of the mission is to drop a cube into the crate. This is straight forward and a common objective in FLL missions. The second part is to lift the crate up. The middle height can be achieved with some simple mechanism or directly with the XY mechanism of the box robots, but for the top height you will need a more complicated attachment such as a scissor mechanism.

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Fllcasts Tip:

This mission has two aspects: crossing under and being 100% supported in the air. The first aspect is a must to complete, because it is just manoeuvring you robot to cross under the bar.

If you are a starting team we would recommend completing M07. Robot Dance

The way to accomplish the pull up if to have a light robot and a sturdy set of gear wheels. In almost every scenario the motors alone would not be able to pull the robot. You would need to construct a system of gear wheels that is for torque. Make that system as secure as possible, skipping gear wheels will not help you!

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Fllcasts tip:

If you are a starting team we would reccoment compleating this mission instead of M06 Pull-Up Bar. The difference is only 10 points, but M06 is in magnitutes harder.

The simple solution would be to know how much time does your robot need to get to the dancing floor. At the end of the round release the robot from the base and when it gets to the destination make movements that mimic dancing. For example moving forward and backward. Be carfull, because your robot may "fall off" the dancing floor and thus not complete the mission. Keep the dancing simple.

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Fllcasts Tip:

The most important thing is to communicate with the other team which color cube you are going ot exchange. Every point counts if you want to contunue further in the rounds.

When you are near the Frame always aim at the Target. In order to align propertly to the Boccia Aim it would be nice to follow the line to there or atleast align to the line. Accurate turning is always a plus.

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Fllcasts Tip:

The tires could be flipped with a an attachment that follows the idea of FLL 2017: Attachment The Manhole Cover (08th) Mission, but stronger because the tire are way heavier.

In this mission the black tire cannot cross the red line, which means that you cannot bring it back to base and flip it. If the the black tire crosses even partially the black line - the points don't count.

This is not true for the blue tire - meaning that you can bring it in base, flip it and then push it back into position.

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Fllcasts Tip:

The easiest way to accomplish this mission is to create an attachment like: FLL 2017: How to accomplish Manhole Cover (08th) Mission in FIRST LEGO League 2017-2018. These attachments are easy to construct and develop, but you have to position the robot on top of the phone for it to work.

Another solution will be to grab the phone and bring it into the base. You can then flip it and push it with the robot somewhere on the field. But be aware that the phone's position on the field is tricky. Meaning that if you get to it to retrieve it, you might as well just flip it on the spot with an attachemnt.

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Fllcasts Tip:

This mission is perfect for many of the FLLCasts Box Robots , because they are tall and have more ground clearance. The robots could easily craw on top of the Treadmill.

You can use the wheels of the robot, without using an attachment. When the robots starts going backward the shaft of the mission model stops and the robot can go out of the mission model with ease.

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Fllcasts tip:

In order to pull the tire from the row machine you will need to use the mass of the robot. You will need an attachment to grab if and then pull it to to the desired place - the small circle. After that the robot moves to accomplish other missions.

Another thing you can do is first pull the tire completely out, and then have the robot or attachment position it in the right place. Once the tire is pulled completely out it is easier to position.

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Before the round you will need to set the machine to a desired level. There are 3 "lelvels" - "easy", "medium" and "hard". There is an increase in the difficulty of the mission as well as the points awarded

There are two intuitive ways to accomplish this mission. The first if to push the lever down. The second is to go to the other side of the mission model and lift the tires. The second is easier because the robot needs less force and it can align to the wall

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Fllcasts Tip:

In order to accomplish this mission it is enough to push the Health Units to the corresponding place on the field. It would be better if your robot does that without the need of an attachment.

Attaching Units to the Pull-Up Bar gives more points, but you will need an attachment for that. We advise that attachment to be passive and release the Heath Units when it hits the Pull-Up Bar. You will need to remember that the maximum Units you can suspend on the bar is 4, if you suspend more you will not be awarded points for them

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Fllcasts Tip:

Do not touch or interrupt the robot outside of the allowed area. Develop better, more consistent and reliable programs and constrictions.

Avoid using runs that "work sometimes", because the benefit of accomplishing the mission sometimes is less then the loss of interrupting the robot and losing points.

Be a dude!

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