Hey, all. I’m open sourcing my small competitive robot from last year, YellowBot_02, as well as a general-purpose chassis I designed based on it. All are shared as OnShape links (a web-based CAD that works like SolidWorks); you can export STLs from there or fork it and design further. The chassis is covered in a grid of 3mm holes at a 6mm distance; this makes it easy to design accessories in whatever CAD you like and attach with #6 or M3 screws and nuts (or even just zipties).
Here’s a general purpose chassis I developed from that: ScienceBot. Same hole pattern, but in more places, and no big name on the back. I’m using this design for my undergraduate research students, too. Includes vertical mounts for an Arduino Uno plus Raspberry Pi (the latter not relevant to MiniFRC), a 3×18650 battery pack and 5V regulator (neither relevant to MiniFRC), and three MaxBotics ultrasonic sensors (probably not relevant to MiniFRC). Compatible with all the same mounts and motors as the YellowBot_02 chassis above.
A long time ago I posted YellowBot, a little robot built in one day. I am now ready to introduce YellowBot_02.
YellowBot_02 is a robot designed to compete in MiniFRC 2019, a quarter-scale version of the FIRST Robotics Competition hosted by the TerrorBytes (FRC team 4561). Design based on the full-size 2019 FRC robot by the RoboGladiators (FRC team 6426). The competition this robot was designed for is a 1/4-scale version of the FRC 2019 game, Deep Space. This particular bot is designed to transport “cargo” (2.25″ plastic ball pit balls) into the “cargo ship” (an elevated depository).
After seeing this video, I was inspired to hunt down and purchase some early-model LEDs. It turns out you can get Soviet-era gold-plated LEDs from the 1970s on eBay, so I grabbed some of these and made a little thing to show them off.
The LEDs came from a seller in the Czech Republic and arrived via registered mail (the kind you have to go to your post office to sign for). The actual LEDs are gold plated, and you can see the actual junction clearly inside the lens.
I put two of them into a breadboard with an ATtiny85 programmed in Arduino to do a simple alternating blink pattern. I designed a 3D-printed display to hold it, spliced some USB to power it, and made a little label to explain what the thing was, and now I have a neat little thing to put on the shelf.
I had some new ideas on generating pictures based on Z-order curves. For speed this time, I wrote some truly horrific but decently fast C code to render stuff. I also re-did some of my earlier Hibert curve stuff in C.
I do in-house backups for my data, but the system that eats the data now is an all-in-one Intel Atom PC with a dying fan, and I don’t really trust it. Luckily we’re in the future, so fanless ARM-based computers are everywhere, so I built a little backup machine out of one. Details after the break.
Sorry I haven’t posted more. I have done some cool projects, but finding time to post has been hard. To help fill that gap, here’s a report I wrote up detailed a small chapter in my involvement with Team Blue Devil Ocean Engineering, which is Duke’s entry into the Ocean Discovery XPRIZE, a world-wide contest to develop the technology to map 500 km^2 of ocean floor in 24 hours. It presupposes some knowledge about the project, which you can find in this brochure or even these slides, or you can just dive in and have fun gawking at this crazy thing we built, sunk 2km deep in the ocean, retrieved, then debugged.
Details of an intense 48-hour effort to build an deep-ocean-survivable Arduino control circuit for underwater rockets is after the break. It was written as an after-action report for the project, so the language is a bit drier than usual, but I think it’s still a fun read.