/r/FLL

Photograph via snooOG

The subreddit for FIRST Lego League


Welcome to the sub-reddit for the international First Lego League (FLL) competition. This is a engineering competition focused toward kids in aged 9-14. The competitions consists of two main parts: Robot Building and Problem Solving. They'll have from September to January to build their robot and solution around the varying themes from year to year. They will also provide an answer to a large question and show it to judges at local competitions, leading up to the FIRST Championship's FLL World Festival, where they will compete against the best 100 of the over 15,000 teams competing worldwide.

Rules

  • No spam.
  • All posts must be directly related to FLL or other FIRST programs.
  • Be respectful and appropriate to all other members of this sub-reddit. Since this is primarily a kids-oriented competition, please keep all language G Rated.
  • Follow all reddit-wide rules.
  • Follow general reddiquette.

FLL Links

Related Subreddits

/r/FLL

2,719 Subscribers

16

To Pybricks or not to Pybricks ...

Based on things we've read here and elsewhere, we're considering switching from Spike to Pybricks for block-based coding during our offseason. Some questions that could help a lot:

  • Has anyone made the switch and then gone back? Why?
  • I've read that many see much better consistency with the gyro functionality you get with their driving base code compared to the typical PID-light implementations you see in Prime. But I also see people say not to switch if you're just doing it for better consistency. Thoughts?
  • We're a young team and would for sure be using the newer code blocks (vs raw Python). Is the learning curve comparable to using Spike?
  • We currently cluster groups of missions per numbered slot on the hub. Since you can't send code to individual slots with Pybricks and have to use a menu system for code-switching, do you find this to slow things down regarding launch times when competing?
  • What else should we be considering? Other sharp corners, etc?
19 Comments
2025/01/31
16:14 UTC

0

What gives me the most points

so my schools team we are in criatia and we programmed 2/16 missions but made everything else what gives the mkst points and do we have a chance to go to finaks cuz we are in semifinals also w ehave good teamwork whuch i heard is immportant

6 Comments
2025/01/31
13:06 UTC

17

Line following question from an engineering professor

After watching our daughter compete in FLL for her 3rd year, and comparing the game mats each year to the previous one, my husband says he is very concerned about what First is promoting for the future of our younger engineers. He teaches software engineering and cannot fathom why they have shifted away from using line following. Last year's Masterpiece mat and this year's Submerged mat left most teams using only gyro due to the riot of color. He said he is worried that he will be getting kids who only know how to successfully use one sensor when they get to high school enrichment camps and college.

He was not very impressed with FTC when our older daughter was in it as it is predominately just a fancy remote-controlled car with minimal sensor usage during the 30-second autonomous portion. So the question is twofold. First, does anyone know why they have made this change? And second, does anyone know who selects the game designs at First so that he, as a professional, not as a parent, can offer feedback?

18 Comments
2025/01/30
21:05 UTC

3

Teams with a mix of old and new members

Most of my kids are aging out but 2 current members want to continue. I want to start team this fall for my younger child. What are your thoughts or experience with having a team with seasoned members and brand new members? Will the age/experience difference be a big problem?

3 Comments
2025/01/30
18:55 UTC

9

Innovation project impact

We are the Robotics for the Future team from Morocco, participating in the FLL Challenge. Our innovative project involves equipping ships with an electronic system to measure noise levels, enabling the crew to take necessary actions to reduce noise, such as slowing down and maintaining propellers and engines. This aims to assist marine scientists in studying the behavior of marine animals. Thank you for taking the time to complete this form to help us assess the impact of our project on marine life and its explorers

https://docs.google.com/forms/d/1rEFmSqQlgS5cy_PFWWoj4wPX-jVs-xdIMzxxWvpznz8/edit

https://preview.redd.it/pxfs5vuldtfe1.png?width=1191&format=png&auto=webp&s=1682bd53c6d74c232dd25ab27259fd6e946a21dd

1 Comment
2025/01/28
22:21 UTC

4

Why does my SPIKE Prime program have a slight delay after pressing the button?

Has anyone noticed a slight delay when starting a program on the SPIKE Prime? When I press the button to run it, there’s a brief wait before it actually starts executing. I’ve seen some teams that don’t seem to have this issue. For context, I’m using the stock SPIKE Prime app for coding. If you’ve experienced this and have a solution, how do you fix or reduce the delay?

6 Comments
2025/01/27
14:44 UTC

14

My New FLL Scorer and Strategy Planner With Timer and Run Saving

Hey! I've been developing an Fll Scorer at fllscorer.com for the past few years and it's finally in the state that I can share it with the community. It has a modern look with a built-in timer, you can save your runs and look at your stats on the site. You can also select the mission you want by clicking on the bar graph that represents it, which also dynamically updates based on the score you input.

https://preview.redd.it/qaps2eyz5ife1.png?width=1920&format=png&auto=webp&s=1ca070957390dfd1c6b5f77b278625f003c68ac2

13 Comments
2025/01/27
09:05 UTC

4

How to score well in presentation

Hi everyone with the recent changes in the judging rubrics I was just wondering what is the best aproch to take to score the highest in Project research, Core Values, Robot design. I’m looking for any recommendations and you might have done or seen in the past that’s really popped out to you in the context to presenting style. Additionally in what ways would you recommend is best to wow the judges.

Thank you so much for your response in advance

5 Comments
2025/01/26
18:31 UTC

2

How Pybrick installation works

2 Comments
2025/01/25
14:19 UTC

14

Missions robot instructions

Hello guys I'm searching for any help to build my FLL Missions robot Anyone have instructions PDF for base robot ? Btw I've lego mindstorm kit

14 Comments
2025/01/25
06:20 UTC

6

Document to judges

Hello everyone recently my team and I have had the thought that we would print out a document full of information data and other facts about our project research (kind of like a research paper that we our self have written citing a bunch or other papers ) and just give to the judges I wanted to ask is this the writing thing to do. Would it be accepted by the judges and help us improve our scores and they same thing we plan to do for robot design show casing all the different changes and improvements we have made to our robot and different codes we tested

11 Comments
2025/01/24
20:07 UTC

3

Activity suggestions?

This is going to be my second time participating to the FLL. Last year, I have seen that some teams were doing some activities with the other teams. For example one team had a speaker and they have danced and even invited others! A team had a T-rex costume! Another team interviewed us with a microphone! A team came with a colored spray and dyed some people's hair! Do you have any activity suggestions like that?

6 Comments
2025/01/23
20:38 UTC

8

Battery Robot reveal is up!

It up!!! 🤩🤩🤩 PetroBlitz’s robot solella (solella is battery in Hebrew )🐙🎬🔋

https://youtu.be/tL32fvMF_Pg Enjoy watching :)

0 Comments
2025/01/22
17:09 UTC

7

Drive straight code

I'm a coach of a New FLL team. My team struggles do to the spike primes nature to drift. I've heard of other teams using a my block to drive straight. This groups already used my blocks to turn left and right so there familiar. It's like something that auto corrects the path. I'm not trying to give to do anything for them of course but I was just wondering if there we any resources/videos they could watch to help them understand how to make the myblock and drive straight.

15 Comments
2025/01/22
02:34 UTC

3

I just got voluntold to judge at an FLL meet, what do I need to know?

4 Comments
2025/01/21
05:07 UTC

1

Moving the robot straight and making perfect turns unsing the gyro sensor.

Hi everyone ;

Hi, my team is struggling with making the robot moving straight and making perfect turns using the gyro sensor. I've tried many programms but it doesn't work acctuly, can someone provide me with a code that can help me achieve my objectives and allow me to determine the distance to move in cm or inches and the degrees to turn?

11 Comments
2025/01/20
15:46 UTC

11

Strategies for a common starting point for missions

I have come realize over time that where one starts on each mission is initially based on the kids thinking that it is the most convenient location, so say, aligned to the mission or closest to the first mission etc. This then ends up with kids having some marked position (usually a vague one: ok letft wheel on this line, right wheel on this ) . After a week they forget where the position was and then they start adjusting the program to fit the new start position and wasting time. And then come game day, they are trying to mentally recall which runs had which start positions and so forth, add to that the tables at tournaments do not exactly match the one at home and so forth.

What have folks found to be a consistent way to start each run. Of course, you could say I always start with the wheels on these two lines and backing up to the wood board.

What are other strategies folks teach kids for this.

8 Comments
2025/01/17
23:48 UTC

9

I have a question for judges

My team has 9 attachments, and we plan to enter the presentation room with each team member holding one. Initially, we’ll place them on the floor or table behind us. During the robot presentation, we’ll pick up the attachments, and the person discussing a particular topic, like the tool used to position the robot, will hold it and demonstrate it. The question is: if we achieve only 300-350 points but our strategy and attachments are worth 620 points, is that a problem? Will the judges think badly of it?

13 Comments
2025/01/16
21:04 UTC

1

How do you do a repeat command in python for pybricks?

I've been trying out pybricks and it's super fun! But I don't understand how to exactly do loops, I understand how the "while True" loops word but not the ones that I need, which are the specific ones to repeat like 4 times

6 Comments
2025/01/15
05:37 UTC

7

Multidirectional lift attachment?

Hello! I've seen this type of multidirectional forklift attachment in previous years highlight videos and now just came across the Hammerheads our of Canada in this newsclip https://youtu.be/lVsr5TL387c?si=83ijVTTOgLzrEG_k using an amazing attachment to accomplish what they need.

I'm so curious if anyone has build instructions for something like this? Or even a name for this type of attachment? Thanks for any help

7 Comments
2025/01/13
03:17 UTC

1

How to make Turns using PID & moving Forward with PID?

Hi
can someone help us with making a block in spike so we can make our turns faster and more accurate and the same thing for moving forward
We have tried a few block but they werent accurate at all

7 Comments
2025/01/12
15:54 UTC

12

Searching FLL Scorer App Beta Testers

Hey everyone!

I've been developing a new FLL scorer app called RoboScore. While there are already a few apps, in most of them you can't change the order of missions and in none I've checked out it has been possible to define score calculators for custom challenges, like the Off-Season Challenge, or for the some teams from the DACH region, the LiveChallenge.

This is why I've created RoboScore, a new app that can do all of the above.

The app is available in the App Store: https://apps.apple.com/tr/app/roboscore/id6738022097 (note: there is still a small bug in the submerged score calculator. I've submitted an update, once it gets approved by apple it should be fixed. In the meantime, you can download and import a fixed calulator from here: https://yurix.ch/fllcounter/assets/calculators/submerged.xml)

I'd also like to publish it for android on the Google Play Store. For that, I need beta-testers that have the app installed for a period of at least 14 days so that Google allows the app in the Google Play Store. I'm still searching beta-testers. If someone has an android phone and is willing to test the app, I'd appreciate it if you could DM me the email of the goole account you are using in the Google Play Store so I can add you to the testing program (it won't be shared with anyone else). If the age of your google account is below 18, it might not work, but we can try it anyways.

https://preview.redd.it/vppql3mvikce1.png?width=1284&format=png&auto=webp&s=9571684b5351f07db7f240b1148987ae5fe3e592

13 Comments
2025/01/12
13:59 UTC

1

What is the fll map dimensions?

The map, not the table.

2 Comments
2025/01/12
13:21 UTC

11

I’m a student and my team is going to state

I have never been what should I expect

4 Comments
2025/01/11
23:17 UTC

7

Should i start with spike then move to pybricks?

I've seen that pybricks is the best python coding software that there currently is, but I see that the tutorials and the guides are very complicated. I also see that spike has a more begining type of feel to it, so what should i do?

10 Comments
2025/01/11
03:27 UTC

8

Can i start from the base like that?

9 Comments
2025/01/10
13:21 UTC

7

Robot inaccuracy

Our robot is not accurate We have tried anything but every run of the same program is always slightly different. We hit a proper bottleneck because of this: we can't even add more attachments, cause if we did it could never complete other missions with all of this inaccuracy I'm desperate to understand what the heck is wrong.

31 Comments
2025/01/10
10:30 UTC

3

Pybricks question

I understand that you kinda needs to create the spike interface when using pybricks, but because it's like a code that you run, does that code run automatically every time that you turn on spike?

1 Comment
2025/01/09
00:18 UTC

2

Attachment lifting/coming off the robot during the missions

We are running into this challenge where attachment will lift a bit off the robot while doing the mission like shipping lane (when the lifting mechanism meets some resistance) even after the attachment is attached to the body of the robot with multiple pins. We were trying to build slip on (or drop in) attachments but this issue has left us struggling.

Has anybody faced the same issue and any ideas on how to tackle this.

3 Comments
2025/01/07
18:27 UTC

4

Qualifier pivoted to virtual

Thank you to all judges, referees, and PDP organizers. Switching to virtual was the right call with the ice today. It created a new hurtle but was much better than canceling with a lottery advancement.

Watching the video on FIMO's channel now. Brittany Woods Q10.

0 Comments
2025/01/05
23:31 UTC

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