The R256 single-axis controller and driver is engineered to feature the same compact size as its predecessor, yet is capable of increased microstepping resolution and higher output current. It is capable of step resolutions ranging from 2× to 256×, and it operates from +12 to 20V dc. Its phase current ranges from 0.1 to 2A peak. It is designed to be programmed via serial port and used as a stand-alone unit with no PC connection required.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies.
You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived.
So if you can't attend live, attend at your convenience.