Skip to main content

RobotRemix #5 - Catfish

              CATFISH 

       by Anton Vanhoucke

This Robot Remix is a combination of the
LEGO MINDSTORMS Set 31313 & LEGO 
Technik 42076. The inspiration for the catfish 
comes from the amazing fishes of Professor Ikuo
Yamato









The Design Phase :


I began with a drawing. Then, I made crude prototypes to test a lot of different mechanisms and
weight distributions quickly. I also invested a lot of time in a propulsion system that was only 
powered by the tail. That worked, but the movement was unrealistic. So, I powered the front wheels
in the end. I also wrote 10 different programs until I was happy. I think I took the fish completely
apart about 20 times during the desing process.

How it Works :

I'm especially proud of the movement. Using only 3 motors, I was able to animate one mouth, two fins, forward movement, and 3 tail segments. I strived to come really close to true fish behaviour in terms of size an frequency of movements.




Programming Complexity :

I spent about 30 - 40 hours programming the fish. It's hard to synchronize all movements. It is
therefore hard to transition smoothly from one movement (eg. standing still) to another (eg. a slight
left turn). All possible transitions have been made because of the fact that the button is remote 
controllable.

There are 620 parts in the 31313 set and 1020 in the 42076 box. The fish has 530 parts. I built a 
fishing rod with the leftovers, but you can't catch the fish with it!

If you want to make one too :
Build instructions an code can be downloaded here
   

Popular posts from this blog

MINDSTORMS Retires!

2023 is the 25th Anniversary of the MINDSTORMS brand. For 25 years, MINDSTORMS has educated and inspired a generation of robot builders, both children and adults. Unfortunately, the LEGO Group decided to end the line on December 2022. Many ROBOTMAK3RS have been passionately involved with the development of MINDSTORMS through the MUP and MCP programs. Even with the newest Robot Inventor line, several ROBOTMAK3RS were invited to submit additional bonus models that were included in the official app. Regardless of the retirement of a major LEGO robotics product line, ROBOTMAK3RS continue to MAKE-SHARE-INSPIRE using all LEGO robotics platforms available to us. Here is the official statement from LEGO. Since its launch in September 1998, LEGO MINDSTORMS has been one of the core ‘Build & Code’ experiences in the company’s portfolio, carrying with it significant brand equity and becoming a stand-out experience for the early days of consumer robotics and leading to current Build & Code

Celebrating 25 Years of MINDSTORMS

In celebration of the 25th Anniversary of MINDSTORMS, we take a trip through history. Please also visit ROBOTMAK3RS Community every week as we highlight different projects all through 2023 in celebration of the anniversary. Some of the early history is based on the content shared by  Coder Shah  in our  MINDSTORMS EV3 Community Group . Some of the text and links may have been edited from his original posts for consistency and clarity.  1984 - Kjeld Kirk Kristiansen watched a TV program called "Talking Turtle," where MIT professor Seymour Papert demonstrated how children could control robot "turtles" using LOGO, a programming language he developed. 1988 - The collaboration between MIT and LEGO resulted in LEGO TC Logo in 1988, which allowed students to control LEGO models using computer commands. The video shows Papert demonstrating TC Logo. 1990 - LEGO TC Logo was hampered since the robots you built had to be tethered to a personal computer. LEGO and MIT

Celebrating MINDSTORMS with a Remix Part 1

In honor of the 25th Anniversary of MINDSTORMS, we asked ROBOTMAK3RS to combine a LEGO set of their choice with a MINDSTORMS set. Here is what these five ROBOTMAK3RS came up with.  MINDSTORMS Chess Assistant by Arvind Seshan Overview: When you are new to chess, it can be a challenge to remember which pieces go where. Now, you can use machine learning and LEGO MINDSTORMS Robot Inventor to build a tool to help you learn where all the chess pieces go on the chess board. Sets used: LEGO® Iconic Chess Set (40174) and MINDSTORMS Robot Inventor (51515) Review: I really like how the chess set base can store all the pieces underneath and that the board neatly splits in half for handy storage. The chess pieces themselves are very sturdy and well built. My only criticism is the building of the box itself. It was quite difficult to see what pieces to use and since the entire box is made mostly of thin plates, it took a lot of time and patience. I would have liked the storage area to be sliding dra