Wind-up Robot

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Travolta NXTthe dancing robot, reads color-coded dance instructions from a strip of paper and then performs the dance, in front of the astonished audience.

The code for the project can be found at https: This repository contains two branches, master and modelmaster. The first wind up ballerina nxt robot the implementation of the robot directly over Lejos, while the latter uses our component language.

A short comparison of the two follows. Due to the difficulties with the component language see discussion belowTravolta is not as "neatly componentized" as I had hoped. It consists of the main "brain" component, which holds all of the "business logic", and several components for sensors and motors. The brain employs an internal state machine to do its work in iterations. I aimed for wind up ballerina nxt robot more modular design, where a Reader component would read the instruction, a Dancer component would carry them out, etc.

Before implementing the robot in the component language developed by Eran and Ido, I thought Wind up ballerina nxt robot get some hands-on experience with Lejos directly. It proved quite easy, and within two hours and LoC I got the project up and running.

It was divided into a reader-loop that read instructions from the paper strip and a dancer-loop that executed the dance moves.

When I set off implementing the robot using the component language, I began to realize it just doesn't fit my needs. Being component-oriented perhaps borrows from other low-level, embedded languages like VHDL, but it just didn't capture the right abstraction for my project.

Simply put, my code had control flowstarting wind up ballerina nxt robot A, moving to B wind up ballerina nxt robot then to C. Trying to view each step as a component was artificial and didn't really work. Moreover, the expressive power provided by the component language is that of a finite state automaton FSA. In order to read instructions and act on them, I had to have some sort of memorywhich requires something equivalent to a pushdown automaton PDA. Solving this required either implementing a "queue component" into which I could push values wind up ballerina nxt robot later on pop them, or just going "full Java" and implementing the compute method directly.

While the first approach was feasible, it didn't fit my deadline, and managing the entire state machine of the robot as an FSA required too many states, which made things impossible to follow and debug. Therefore, I resorted to implementing the compute method myself and writing my "business logic" in Java, where I could make use of ArrayList and other data structures; essentially, the only benefit I got form the component runtime was the "main loop" and the Escape button being handled externally.

The result was LoC of both cmp and Java code and required two days to implement and debug. I would also like to note that other projects done in the component language, like the Platoon robots, have a single component with a "huge state machine" to manage their state; it seems that control flow in the component language can hardly be modular, which has led me to the conclusion that it's simply not the right abstraction for most projects. I had to fix it manually in the generated TravoltaFactory.

Travolta NXT April 14,

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This site uses cookies. To find out more, read our privacy policy. This article was taken from the July issue of Wired magazine. Be the first to read Wired's articles in print before they're posted online, and get your hands on loads of additional content by subscribing online. When he was working towards a masters degree at Cambridge, Daniel Strange had to spend hours dipping bits of metal into mineral and protein solutions to create a bone-like material. It was important work that could lead to advances in medical implants, but it was mind-numbingly boring.

So he automated the process by turning to an unlikely source. Using a Lego Mindstorms NXT kit, Strange, 25, built and programmed a crane that moves in a set path, raising and lowering the sample between beakers containing solutions.

The lab now has two of them working round the clock. It's a very flexible platform. The Lego cranes have already featured in the journal Acta Biomaterialia in a paper on the bone-like material they help produce. Our robots make that easier. Pillars of Eternity 2 captures the joy of tabletop gaming.

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As Hubble turns 28, check out the marvel of the Lagoon Nebula. All the best Netflix TV series worth watching right now. And if a ten-year-old can use it, I hoped that I could. Combine Lego with a Raspberry Pi to make the most nostalgic computer of all time. At Open House London this weekend? Here's a handy guide. By Sian Bradley Design 15 Sep This designer uses LEGO to build prosthetics for children injured by landmines.