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RVM is an effective way to manage Ruby versions on Linux or OS X. RVM was working well on my Ubuntu-based Parallella, until one day it stopped: linaro-nano:~> rvm list rvm: Command not found. linaro-nano:~> rvm: Command not found. Fortunately,...

Update: Here’s a 25-minute video intro to Parallella. Parallella is a single-board supercomputer smaller than a deck of cards. While today’s fastest laptops contain four processor cores, Parallella has eighteen (2 ARM cores plus an Epiphany chip with 16 RISC...

OpenROV is an underwater robot controlled through a web browser. The server-side of the web app is written in Node.js, running on a BeagleBone Black inside the OpenROV. You don’t need to know Node.js in order to pilot an OpenROV....

You know what the trouble is? We used to make things in this country, build things. Now we just put our hand in the next guy’s pocket. ~Frank Sobatka David Lang is a maker. After a stint with a struggling...

How many motors are in the typical automobile? The knee-jerk response might be “one, the big metal thing under the hood”. Upon further reflection, we may recall the motors that operate many devices in today’s automobile: windshield wipers, power windows,...

In the early days of robots people said, ‘Oh, let’s build a robot’ and what’s the first thought? You make a robot look like a human and do human things. That’s so 1950s. We are so past that.  ~Neil deGrasse...