It wasn’t an easy weekend for the rest of the world’s hackers and makers, that of the Bay Area Maker Faire. Open your social media accounts, and most of your acquaintances seemed to be there and having a great time, while the rest were doing the same at the Dayton Hamvention. Dreary televised sports just didn’t make up for it.
MCM Electronics had the Maker Faire booth next to that of the Raspberry Pi Foundation, and since they needed both a project to show off and a statement item to draw in the crowds, they came up with the idea of a 10x scale reproduction of a Raspberry Pi above the booth. And since it was Maker Faire this was no mere model; instead it was a fully functional Raspberry Pi with working LEDs and GPIO pins.
The project started with a nearly faithful (We see no Wi-Fi antenna!) reproduction of a Raspberry Pi 3 in Adobe Illustrator. The circuit board was a piece of MDF with a layer of foam board on top of it with paths milled out for wiring and the real Pi which would power the model, hidden under the fake processor. The LEDs were wired into place, then the Illustrator graphics were printed into vinyl which was wrapped onto the board, leaving a very two-dimensional Pi.
The integrated circuits and connectors except for the GPIO pins were made using clever joinery with more foam board, then wrapped in more printed vinyl and attached to the PCB. A Pi camera was concealed above the Broadcom logo on the processor model, to take timelapse pictures of the event. This left one more component to complete, the GPIO pins which had to be functional and connected to the pins on the real Pi concealed in the model. These were made from aluminium rods, which were connected to a bundle of wires with some soldering trickery, before being wired to the Pi via the screw terminals on a Pi EZ-Connect HAT from Alchemy Power.
Is the challenge now on for a range of compatible super-HATs to mate with this new GPIO connector standard?
We previously covered the 2012 Maker Faire exhibit that inspired this huge Pi. The Arduino Grande was as you might well guess, a huge (6x scale) fully functional Arduino. In fact, the world seems rather short of working huge-scale models of single board computers, though we have featured one or two working small-scale computer models.
Thanks [Michael K Castor] and [Christian Moist] for sharing their project with us.
There’s a car race going on right now, but it’s not on any sort of race track. There’s a number of companies vying to get their prototype on the road first. [Anurag] has already completed the task, however, except his car and road are functional models.
While his car isn’t quite as involved as the Google self driving car, and it doesn’t have to deal with pedestrians and other active obstacles, it does use a computer and various sensors to make decisions about how to drive. A Raspberry Pi 2 takes the wheel in this build, taking input from a Pi camera and an ultrasonic distance sensor. The Pi communicates to another computer over WiFi, where a neural network operates to make decisions about how to drive the car. It also makes decisions based on a database of pictures of the track, so it has a point of reference to go by.
The video of the car in action is worth a look. It’s not perfect, but it’s quite an accomplishment for this type of project. The possibility that self-driving car models could drive around model sets like model railroad hobbyists create is intriguing. Of course, this isn’t [Anurag]’s first lap around the block. He’s already been featured for building a car that can drive based on hand gestures. We’re looking forward to when he can collide with model busses.
Continue reading “Self-Driving Cars Get Tiny”
[Ian Jimmerson] has constructed a detailed model of a radial engine out of wood and MDF for an undisclosed reason. Rather than just delivering the wooden engine to wherever wood engines go, [Ian] decided to take the time to film himself disassembling and reassembling his engine, explaining in detail how it works as he goes. He starts by teaching about the cylinder numbering and the different possible cylinder configurations. It only gets better after that, and it’s worth watching the full 20 minutes of video. You’ll leave with a definite understanding of how radial engines work, and maybe build something neat with the knowledge.
Our only complaint is the lack of build photos or construction techniques. It’s a real feat to build something with this many moving parts that can run off an electric drill. Was a CNC involved, or was he one of those hardcore guys who manage to get precision parts with manual methods? Part 1 and 2 after the break.
Continue reading “Learn How A Radial Engine Works or Gawk at Amazing Wood Model”
New FAA rules are making radio-controlled aircraft a rough hobby to enjoy here in the USA. Not only are the new drone enthusiasts curtailed, but the classic radio-controlled modelers are being affected as well. Everyone has to register, and for those living within 30 miles of Washington DC, flying of any sort has been effectively shut down. All’s not lost though. There is plenty of flying which can be done outside of the watchful eye of the FAA. All it takes is looking indoors.
Continue reading “Surviving the FAA Regulations: Modelers Move Indoors”
[Eric Tsai] is on a home-automation rampage. Not content with the usual smartphone-based GUIs, [Eric] built a cardboard model house that models his house. Open the garage door, and the model house’s garage door opens. Open the real front door, and a tiny servo motor opens the cardboard front door.
The model house also comes with a power meter that represents his current power usage, which is certainly useful for figuring out if something electronic has gone grossly wrong. You should watch the video (found after the break) all the way through, here’s the spot where he turns on an electric leaf blower. Despite a little big of lag that’s pretty cool!
But the system doesn’t stop there. Since he can control the garage door and some lights remotely via WiFi, the next logical step is to add a couple of buttons so that the model house can control the real house.
We’ve covered [Eric]’s home before. He set up simple, Arduino-based sensor packages all around his house, connected them together through the pub/sub framework MQTT and added in the open-source OpenHAB software interface. The door sensors connect to a hacked Wink hub. From whether or not his dog is barking to whether his laundry is done, [Eric]’s system knows it all.
Continue reading “Model House Models House, Vice-Versa”
At Maker Faire this weekend. tucked in between a building full of homegrown foodstuffs and a rock polishing booth is the Bay Area Garden Railway Society (BAGRS). They’re running a few live steam locomotives, and they’re beautiful works of engineering and modeling. None of these trains are electric; they all move by boiling water with either coal or butane. It’s a true, proper locomotive running on 45mm gauge track.
[David Cole] of BAGRS gave me the walkthrough of their booth. It’s a simple oval track that took a solid day to level out. There are technically three sets of tracks, two G-scale, and another O scale sharing a rail with a G-scale track. Each and every one of these locomotives is powered by steam produced when water is heated by either coal or butane. Butane is the fuel of choice because of its ease of acquisition, but BAGRS had a few coal-fired locomotives with tiny shovels shoveling anthracite into tiny fireboxes. After loading up with water and getting the firebox nice and hot, these locomotives will cruise around the oval track for about half an hour, with the speed of the locomotive controlled by a servos and RC gear.
Maker Faire isn’t the headline event for BAGRS; in July 2016 they’ll be hosting the National Garden Railway Convention in San Francisco. If you’re local to the Faire, it will be a cool event to check out.
If there’s a science fair coming up, this trumps just about any 2D poster. It’s a 3D topographical map of an inactive Slovakian volcano, Poľana. [Peter Vojtek] came up an easy way to generate SVG topo patterns using Ruby.
Topographical data is available through the MapQuest API. You should be able to model just about any part of the world, but areas with the greatest elevation difference are going to yield the most interesting results. The work starts by defining a rectangular area using map coordinates and deciding the number of steps (sheets of paper representing this rectangle). The data are then chopped up into tables for each slice, converted to SVG points, and a file is spit out for the blade cutting machine. Of course you could up the game and laser cut these from more substantial stock. If you have tips for laser-cutting paper without singing the edges let us know. We’ve mostly seen failure when trying that.
The red model explained in [Peter’s] writeup uses small cross-pieces to hold the slices. We like the look of the Blue model which incorporates those crosses in the elevation representation. He doesn’t explain that specifically but it should be easy to figure out — rotate the rectangle and perform the slicing a second time, right?
If you’re looking for more fun with topography we’ve always been fond of [Caroline’s] bathymetric book.