It’s mind boggling how much e-waste we throw out. Perfectly good components, mass produced for pennies. And at the end of their life, going straight to a landfill or some poor country to be melted down. Don’t you wish you could help?
Stepper motors are a dime a dozen when it comes to e-waste, and there’s tons of cool projects you can do with a stepper motor — [Madivak] is just starting on a robot arm design over at Hackaday.io that makes use of recycled components.
It’s fairly early in development, but that means it’s a great time to start following it on the project site. The robotic arm is being designed for his final year project in his undergrad degree. Besides the steppers, he’s using his school’s Utilimaker 3D printer to manufacture all of the other mechanical components with control coming from DRV8825 stepper drivers and the Freescale Freedom KL25Z dev kit. Check out the clips after the break to see current state of the build.
You can buy a dongle with a weird industrial connector that fits under the dash of any car on the road for $15. This is just a simple ODB-II transceiver meant for reading error codes and turning a Crown Vic into a police interceptor. There’s a lot more to the CAN Bus than ODB-II; robots and industrial control units, for instance, and Hackaday alum [Eric] has developed an open source tool for all things CAN.
[Eric] built this tool because of a lac of open-source tools that can talk CAN. There are plenty of boards floating around that can reset codes in a car using ODB-II, but an open hardware CAN device doesn’t really exist.
The CANtact is a small board outfitted with a USB port on one end, a DE-9 port on the other, and enough electronics to talk to any CAN device. The hardware on the CANtact is an STM32F0 – an ARM Cortex M0 that comes with USB and CAN interfaces. This chip connects to a Microchip CAN transceiver, and that’s pretty much all you need to talk to cars and industrial automation equipment. If doing something legal, moral, or safe with the CAN bus in your car isn’t your thing, Wired reports you can digitally cut someone’s brake lines.
On the software side of things, the CANtact can interface with Wireshark and the CANard Python library. All the files, from hardware to software, are available on the Github. Oh, CANtact was at Black Hat Asia, which means [Eric] was at Black Hat Asia. We should have sent stickers with him.
If not for [Nikola Tesla], we’d be pretty behind when it comes to electricity. So to pay homage to one of the greatest inventors, [David Choi] decided to make his very own wireless Tesla Desk Lamp!
As expected, [David’s] a big fan of [Nikola], and has always been inspired by his life and experiments — in particular he loves wireless power. Ever since he saw a Tesla Coil light up a bulb from a distance he was smitten. He even named his cat Tesla.
The funny thing is, [David] actually failed physics in high school, but a few years later decided to pursue it as a career while attending Wesleyan University. It didn’t stop when he graduated, he also studied electronic design in his spare time — which is where he learned about resonance.
Wanting to apply what he had learned he has created a very unique wireless desk lamp. Don’t let the pictures fool you; it’s actually 3D printed! It uses one of those retro “vintage” light bulbs, which has it’s power transmitted to it wirelessly by a 6.5MHz signal. It was relatively easy to get the wireless part right, because once he had calculated the number of coils he needed, all he had to do was 3D model the track for the copper to go in.
It’s been a few years since the RTL-SDR TV Tuner dongle blew up the world of amateur radio; it’s a simple device that listens in on digital television frequencies, but it’s one of those tools that’s just capable enough to have a lot of fun. Now, we have a transmitting dongle. It’s only being used to transmit live HDTV from a Pi, but that in itself is very interesting and opens up a lot of possible builds.
The key piece of hardware for this build is a UT-100C DVB-T modulator. It’s a $169 USB dongle capable of transmitting between 1200-1350 MHz, and with a special edition of OpenCaster it’s possible to transmit over-the-air TV. There’s no amplifier, so you won’t be sending TV very far, but it does work.
On the Raspberry Pi side of the build, the standard camera captures H.264 video with raspivid, which is converted to a DVB compliant stream using ffmpeg. These are well-worn bits of software in the Raspberry Pi world, and OpenCaster takes care of the rest.
While this seems like the perfect solution to completely overbuilt quadcopters, keep in mind transmitting on the 23cm band does require a license. Transmitting in the UHF TV bands is a bad idea.
The Nintendo 64 is certainly a classic video game system, with amazing titles like Mario Kart 64 and Super Smash Bros that are still being played across the world today. But, like finding new parts for a classic car, finding an original controller that doesn’t have a sad, wobbly, worn-out joystick is getting to be quite the task. A common solution to this problem is to replace the joystick with one from a Gamecube controller, but the kits to do this are about $20USD, and if that’s too expensive then [Frenetic Rapport] has instructions for doing this hack for about $2.
The first iteration of using a Gamecube stick on an N64 controller was a little haphazard. The sensitivity was off and the timing wasn’t exactly right (very important for Smash Bros.) but the first kit solved these problems. This was the $20 kit that basically had a newer PCB/microcontroller that handled the Gamecube hardware better. The improvement which drove the costs down to $2 involves modifying the original PCB directly rather than replacing it.
While this solution does decrease the cost, it sacrifices the new potentiometer and some of the easier-to-work-with jumpers, but what was also driving this project (in addition to cost) was the fact that the new PCBs were becoming harder to get. It essentially became more feasible to simply modify the existing hardware than to try to source one of the new parts.
Either way you want to go, it’s now very easy to pwn your friends in Smash with a superior controller, rather than using a borked N64 controller you’ve had for 15 years. It’s also great to see hacks like this that come together through necessity and really get into the meat of the hardware. Perhaps we’ll see this controller ported to work with other versions of Super Smash Bros, too!
[robin] has a Red Camera (lucky!), an absurdly expensive digital video camera. As you would expect the batteries are also absurdly expensive. What’s the solution? Battery packs from cordless drills.
Cordless drills are interesting pieces of tech that can be easily repurposed; there are huge battery packs in them, big, beefy motors, and enough hardware to build an Automatic Cat Feeder or a motorized bicycle.
What if those old Makita batteries don’t charge? That usually means only one or two cells are dead, not the whole pack. Free LiIon cells, but you need to charge them. Here’s a single cell charger/boost converter that will do the trick.
A problem faced by amateur radio operators around the world is the lack of commercial power. Plugging a portable shack into a wall will work, but for uninterrupted power car batteries are everywhere. How do you combine wall power and car batteries for the best of both worlds? With an In-line battery backup module.
All of the projects above rely on charging a battery through wall power, and sometimes even that is impossible. Solar is where we’re headed, with solar LiPo chargers, and solar LiFe chargers. That’s more than enough to keep a smartphone charged, but if you want to go completely off the grid, you’re going to need something bigger.
[Michel] has been off the power grid 80% of the time since he installed his home PV system a few years ago. How’s he doing it? A literal ton of batteries, huge chargers, and a 5kW inverter.
The Midwest RepRap Festival is over – forever. This was the last one. Apparently enough people complained that Goshen, Indiana wasn’t in the midwest. The number of Dairy Queens I passed contradicts this, but whatever. Next year, there’s going to be a different con in Goshen. Same content, different name. If you have a suggestion, you know where to put it.
Contaminated with masterbatch
The world’s largest 3D printed trash can. People were taking pictures of them standing next to it.
The Groot fail
What the infill looks like on the PartDaddy
I promised the world’s largest 3D printed trash can, and I gave you the world’s largest 3D printed trash can. This gigantic orange vase was printed on the PartDaddy, SeeMeCNC’s 18-foot tall delta printer a few months ago at the NYC Maker Faire. I have been using this as a trash can in my basement since then, making me one of the only people who have their trash can on Wikipedia.
Speaking of the PartDaddy, this is what a fail looks like. The first PartDaddy print was a Groot, a 13-hour long print job. It was left running overnight, but it ran out of PLA pellets sometime around 4 in the morning. If you’re wondering what the black band is around the Groot’s face is, here’s the breakdown:
The PartDaddy sucks PLA pellets up from a trash can (that’s not 3D printed), and dispenses it into a hopper above the print head. This hopper was 3D printed on the PartDaddy, and there is still a little bit of colarant dust in there. When the PLA pellets run out, that dust is embedded in the extrusion. When you realize that masterbatch is only about 5% of the finished plastic, it doesn’t take much black dust to discolor a print.
Yes, this is a print fail that could have been fixed by having an all-night bash. A few other people left their printers running overnight including [The Great Fredini] and his Scan-A-Rama. This was a Rostock Max that had something wonky happen with the Bowden. There was filament everywhere.
How about some Star Wars droids? An R2 from the Droid Builder’s Club was there, but there was also the beginnings of a completely 3D printed Roger. While we’re on the subject of plastic robots that will fall apart at a moment’s notice, there was a K’NEX 3D printer. Yes, it’s made almost entirely out of K’NEX, and it did work at one time. Those orange parts sitting next to it? Those came out of the K’NEX printer. If you’re looking for the definitive RepStrap, there ‘ya go.
Roger Roger, or a B1 Battle Droid
Lincoln death mask in bronzefill. Patinaed with vinegar.
For the last few months, metal filaments – PLA with tiny particles of copper, brass, bronze, iron, or aluminum have been available. MRRF was the first place where you could see them all together. A few things of note: these filaments are heavy – the printed objects actually feel like they’re made out of metal. They’re actually metal, too: the iron-based filaments had a tiny bit of red corrosion, and the Lincoln death mask above was treated with acetic acid. These filaments are also expensive, around $100 for 1kg. Still, if you want to print something that will be around in 100 years, this is what you should get.
The most beautiful printer ever
MRRF should have had a contest for the best looking 3D printer at the show. A beautiful delta from Detroit Rock City would have won:
That white hexagon in the center is a ceramic PCB that I’m told cost an ungodly amount of money. Underneath the ceramic build plate, there’s a few Peltiers between the bed and the large copper heat sink. The heat sink is connected to the three risers by heat pipes, making the entire printer one gigantic heat sink. Why would anyone make such an amazing art deco printer? For this.
Because you can use Peltiers to heat and cool a bed, a little bit of GCode at the end of a print will cool the bed to below room temperature. If you do your design right, this means the print will just fall over when it’s done. When the print bed is cooling, you can actually hear the bond between the bed and print cracking. It’s beautiful, it’s cool, and I’m told this printer will make its way to hackaday.io soon.
There you go, the best and coolest from the last Midwest RepRap Festival ever. There will never be another one. It only needs a better name, and [John] at SeeMeCNC is great at coming up with names. Just ask what VIP is a backronym of.