![]() We have to wonder if it is technically bigger than the six-shooter, because they seem to be roughly the same scale, except that chose a much bigger model to start from. (Video, embedded below.) The Guinness people haven’t shown up yet to award, but at 12.5 feet, this baby is over twice as long as the current record holder, which belongs to former NASA mechanical engineer Mark Rober and his now-puny six-foot six-shooter. Well, here it is: a shoe-in for the new world’s largest NERF gun. We recently saw another 6-DOF actuator design, using flexures, yet another ball-balancing hack, but if you want an actually useful Stewart platform application, checkout this pool-playing robot!Ĭontinue reading “An Interesting Circular Stewart Platform” → Posted in Misc Hacks Tagged 6-DOF, arduino pro mini, h-bridge, Stewart platform, tb6612 Obviously, the sketch running on the Arduino will give the thing a fixed motion, but add in an additional data link over that central slip-ring setup (or maybe a wireless link), and it will be much more useful. Control is courtesy of an Arduino Pro Mini, which drives the motors using a handful of Pololu TB6612 (PDF) dual H-bridge driver modules. One interesting deviation from the usual Stewart platform arrangement is the use of a central slip-ring connector to provide power, allowing the whole assembly to rotate continuously, in addition to the usual six degrees of freedom the mechanism allows. ![]() This circular arrangement is so simple that we can’t believe we haven’t come across it before. With the addition of the usual six linkages, twelve ball joints, and a few brackets, a complete platform is realised. ![]() The common end of each arm rides on the central shaft, each with its own bearing. This is a very neat mechanism comprised of six geared motors on the end of arms, engaging with a large internal gear. ![]() Anyway, here’s an interesting implementation from the the curiously named YouTube channel (no, we can’t find the designer’s actual name) with a series of videos from a few years ago, showing the construction and operation of such a beast. ATmega328 running at 16MHz with external resonator (0.Stewart platforms are pretty neat, and not seen in the wild all that often, perhaps because there aren’t a vast number of hacker-friendly applications that need quite this many degrees of freedom within such a restricted movement range.Note: A portion of this sale is given back to Arduino LLC to help fund continued development of new tools and new IDE features. The latest and greatest version of this board breaks out the ADC6 and ADC7 pins as well as adds footprints for optional I2C pull-up resistors! The Arduino Pro Mini also works with the FTDI cable but the FTDI cable does not bring out the DTR pin so the auto-reset feature will not work. This board connects directly to the FTDI Basic Breakout board and supports auto-reset. In order to accomplish this we used all SMD components, made it two layer, etc. The Arduino Pro series is meant for users that understand the limitations of system voltage (5V), lack of connectors, and USB off board. It's a great board that will get you up and running quickly. We recommend first time Arduino users start with the Uno R3. Arduino Pro Mini does not come with connectors populated so that you can solder in any connector or wire with any orientation you need. This is a 5V Arduino running the 16MHz bootloader. It's blue! It's thin (0.8mm)! It's the Arduino Pro Mini! SparkFun's minimal design approach to Arduino.
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