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

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

Celebrating MINDSTORMS with a Remix - Part 3

The ROBOTMAK3RS continued their celebration of the 25th Anniversary of MINDSTORMS through these Fall and Winter remix projects. Each ROBOTMAK3R was tasked with selecting one LEGO set of their choice and combining it with a MINDSTORMS set. Below are the five amazing models they came up with. Braill3 by Jerry Nicholls Braill3 is an EV3-based LEGO Braille bricks reader. This robot uses its fingertip, made from three touch switches, to read messages written using the LEGO Braille bricks and will speak out what it detected. If it sees a simple maths problem it will attempt to solve it and give the answer as well. To learn more about the process of creating this machine, read Jerry's blog . Braill3 can be viewed here . Set Review: The Braille Bricks set is well thought out. The ratios of the letters is suitable for general use and the addition of some punctuation and arithmetic operators is excellent. There is a card showing what bricks there are and their quantities, but no form of sort...

Celebrating MINDSTORMS with a Remix - Part 2

The ROBOTMAK3RS continued their celebration of the 25th Anniversary of MINDSTORMS through these summer and fall remix projects. Each ROBOTMAK3R was tasked with selecting one LEGO set of their choice and combining it with a MINDSTORMS set. Below are the five amazing models they came up with. Remote controlled material handle r by Jozua van Ravenhorst (aka Mr Jo) This remix combines the LEGO Technic Material Handler (42144) with MINDSTORMS EV3 (31313) It uses the power of pneumatic cylinders to move objects around. By using a bluetooth remote control, very precise movements can be made with this model. Touch sensors in the base chassis prevent the turret twisting the cables that go through the turntable to much. The program has several protections to prevent over pressurizing the system for each of the 3 individual pumps and valves that control the 2 booms and claws. The real version of this machine is mostly used in waste material sites to bring the material to machines that sort and...

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...

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