The USB Implementers’ Forum doesn’t make things easy for anyone building a product with a USB port. To sell anything with USB and have it work like USB should, you need to buy a USB Vendor ID, a $5000 license that grants you exclusive use of 65,536 USB Product IDs. Very few companies will ever release 65,000 products, and there are a lot of unused PIDs sitting around out there.
Now, someone has finally done the sensible thing and put an unused USB VID to work. pid.codes obtained the rights to a single VID – 0x1209 – and now they’re parceling off all the PIDs that remain to open source hardware projects.
This is not a project supported by the USB Implementers’ Forum, and is more of a legal game of chicken on the part of pid.codes. The only thing the USB-IF could do to stop this is revoke the original VID; useless, because they can’t reassign it to anyone else. The original owners of the VID, InterBiometrics, licensed their VID before transferring or sublicensing VIDs and PIDs was prohibited by the USB-IF.
You can get a PID by forking the pid.codes repo, claiming a PID, and sending a pull request. Once that’s accepted, that PID is yours forever.
Filed under: misc hacks
Throughout human history, mankind has worked to enable those with disabilities. This applies especially to those who have missing limbs, either from injury or since birth. Every time technology improves, prosthetics improve along with the way. Unfortunately this now means prosthetics have become expensive systems. Hackers, makers, and engineers are working to make prosthetics more affordable, and more available to everyone. This week’s Hacklet focuses on some of the best prosthetics projects on Hackaday.io!
We start with [Open Bionics] and Affordable Bionic Hands For Amputees. The [Open Bionics] team are using 3D printers to bring the cost of a prosthetic arm and hand down from up to $100,000 USD to just $1000 USD. They’ve also reduced the time to create a custom device from weeks to just 5 days. The team’s current hand has five degrees of freedom, uses electromyography (EMG) for control, and weighs just 268 grams. [Open Bionics] discovered that many amputees are willing to trade off functions for a lighter weight device. Having a sensor and motor studded hand won’t help much if the wearer is worn out after just a couple of hours!
Next up is [yash.gajra56] and RE-ARM. RE-ARM is a prosthetic arm project which aims to help both those who have lost limbs, and those with full or partial paralysis of a limb. Movement is provided by radio control style servos. Control is via voice commands and Bluetooth from a cell phone. [Yash] has incorporated feedback into RE-ARM by using flex sensors. Processing is handled by an Arduino. We like the low-cost, low tech approach RE-ARM uses. We’d love to see everyone have access to a 3D printer, but unfortunately the world isn’t there quite yet. RE-ARM uses readily available components to build a functional prosthetic. Nice work [yash]!
[OpenBionics] brings us Affordable Prosthetic Hands. No, you didn’t read that name wrong. There are two “Open Bionics” on Hackaday.io! This [OpenBionics] team has no space, and is based in Athens, Greece. The other [Open Bionics] team does have a space between the words, and is based in Bristol in the United Kingdom. We’re hoping the two groups can come together and collaborate now that they’re both using Hackaday.io. This [OpenBionics] team is working on prosthetic hands, in the sub $200 USD price range. The team has come up with a novel thumb design which provides nearly full functionality with only one rotating joint. [OpenBionics] also allows their users to selectively lock digits, which allows for up to 144 different grasping postures.
Finally we have [Daniel Mead] with Third World Medical Equipment (Arm). [Daniel] created this project as an independent study back in high school. The idea is create a simple arm with a gripper out of cheap or freely available items. The gripper is fashioned from a bicycle brake. The fitting system is especially novel. [Daniel] used an old soda bottle to create a custom mold for the amputee’s residual limb. Plastic bottles are generally made of polyethylene terephthalate, or PET, a thermoplastic. [Daniel] placed a wet sock over his arm, and a plastic bottle over the sock. Holding the plastic bottle above a fire created enough heat to shrink the bottle to his arm. the sock provided room for padding, and insulated him from getting burned during the molding process.
Not satisfied? Want more prosthetics? Check out the Prosthetics list over on Hackaday.io! If any of these projects inspire you, don’t forget that prosthetics are a great starting point for an entry in The Hackaday Prize!
That’s about all the time we have for this week’s Hacklet. As always, see you next week. Same hack time, same hack channel, bringing you the best of Hackaday.io!
Filed under: Hackaday Columns
Prototyping your own PCBs? At a loss for how to apply your SMT electronics? Well — do you have access to a laser? [Felix] shows us a definitive way to use a laser cutter to engrave SMT stencils with ease.
The real trick here is to engrave — not to cut. Typically if you’re using enough power to cut straight through the plastic, you’re going to get melting and burning of the edges — which won’t work well for a SMT stencil. So what [Felix] found is to engrave at approximately 20-30W @ 400-450mm/s. He’s using Mylar as the material.
The results are pretty awesome — but if you’re without a laser, he also has an excellent tutorial on DIY metal SMT stencils by chemically etching soda can metal!
Alternatively, it’s possible to use a vinyl stencil cutter for SMT applications — just requires a bit of messing around when converting the file types!
Filed under: laser hacks
One of the first popular mass-produced digital cameras was the Game Boy camera, a terrible black and white image sensor stuck inside a highly modified Game Boy cartridge. With a Game Boy, the camera, and the Game Boy printer, it was able to produce low-resolution but still surprisingly usable images. Combine all these parts together with the best of hacker art from [vtol] and what do you get? The Game Boy Instant Photo Gun.
There aren’t many details for this build, but it looks like this is an uncased Game Boy Brick, a Game Boy camera, and Game Boy Printer assembled into something that looks dangerous and won’t get past a TSA checkpoint. That might be fixed by repurposing an old NES zapper.
We’ve seen [vtol]’s work before with a machine that probably doesn’t steal your credit card info, a levitating speaker, and something that doesn’t reference [Tarkovsky] enough. This build is right up there with the rest of them.
Thanks [Itay] for the link.
Filed under: nintendo gameboy hacks
No, we’re not talking about any lock, or car for that matter. The creators of Loxet are so confident in their product, a smart lock for your car, they’ve issued a challenge to the world. If you can defeat it, you can keep the car — sadly the car isn’t anything special though.
The device, after installed on your vehicle, gives you a taste of the premium lifestyle of fancy push-to-start vehicles. It automatically unlocks your vehicle when you come near with your cellphone, and only your cellphone. It also has the option to give access to friends and family using an invite system. It controls ignition access, and works as a proximity lock.
The car is located at ul. Straszewskiego 14 in Krakow. If you’re not from Poland, [Matt] recommends you team up with a local to try your hack. The alternate prize (if you’re not from Poland or don’t want the car) is $2000.
The car is just sitting there. We’d love to see some 1st person attempts from any of our Polish readers living in Krakow! It is currently set to unlock and lock every 10 minutes. You might be able to get into the vehicle — but will you be able to take it? Let us know!
[Thanks for the tip Maxim!]
Filed under: car hacks, contests
Sometimes, awesomeness passes us by and we don’t notice it until a while later. This is from 2012, but it’s so friggin’ insane we just have to cover it even if it’s late. Yuri Suzuki is an installation artist who designed the Tube Map Radio and Denki Puzzles.
The Tube Map Radio is inspired by a diagram created by the original designer of the London Tube map, Harry Beck, which shows the lines and stations of the London Underground rail network as an annotated electrical circuit. Iconic landmarks on this map are represented by components relating to their functions, including a speaker where Speaker’s Corner sits, battery representing Battersea Power Station and Piccadilly Circus marked as Piccadilly Circuit. The work was commissioned by the Design Museum London, and the PCB layout was done by Masahiko Shindo (Shindo Denki Sekkei). The idea was to bring the electronics out of the “black box” and not just display it, but to have it laid out in a fashion that people could try to understand how it really works.
The other project called Denki Puzzles is equally remarkable. It’s a kit meant to teach electronics, using a set of snap-fit components. But instead of having all “bricks” or units of the same shape, the Denki Puzzles are a collection of printed circuit board pieces whose form indicate a particular function. Fit the pieces together as a sort of physical circuit diagram and you’ll be able to build working electronics. For example, the LED unit looks like a 8 pointed star, and the resistance unit looks like a resistance symbol. Check out some pictures and a video after the break
Photo’s Credit : Hitomi Kai Yoda.
Filed under: hardware, news
Back when [Caleb] was around here at Hackaday, he was tasked with making a few YouTube videos. His Portal Gun got 1.6 Million views, and we got a takedown request because of this video even though that company was more than willing to use [Caleb] as a guinea pig at CES.
This post is not about those videos. This post is about the best project we never did yet.
The grand plan for The Best Project was a zombie survival van. It’s exactly what you think it is: a van armored and armed for driving through a herd of walkers. Proposed mods included a cow catcher and roof rack, a motorized turret, a poofer (propane tanks shooting fire from underneath the van), a bartender that launches molotov cocktails, and a beautiful little contraption called an ankler. The Ankler is just a pair of chainsaws that fold out from under the van.
The base vehicle would be a 60s VW bus. [Caleb]’s a big fan of aircooled stuff, and if you think about it, 60s VWs are pretty good for the zombie apocalypse. If you’re doubting that, just ask how many tools it would take to change out the engine in your car.
Although the dream of a Hackaday aircooled zombie apocalypse van died when [Caleb] left, that doesn’t mean we’re still not considering an official Hackaday ride. All of this is still in the planning stages, but we have a few ideas; the first, and biggest, is a mobile hackerspace on a trailer. This would be a standard semitrailer, loaded up with tools, 3D printers, a laser cutters, and a couch. It would be the perfect thing to load up with swag and haul to events.
We’re considering another more sensible vehicle, and right now the top contender is an early 2000s Astro or Safari cargo van. Yes, I know what you’re thinking: the coolest vehicle we could come up with is a minivan. There’s actually some logic to this, so hear me out.
The Astro/Safari shares a lot of parts with the S10, and that means parts are everywhere. The Astro has an AWD variant, and with a 4″ lift, upgraded suspension and big, knobby tires the Hackaday van would be very, very fun to take out into the desert. It can haul eight foot sheets of plywood, they’re cheap, everywhere, and they just don’t die.
While the best idea right now is an Astro van, we’re also considering other AWD vehicles: an AMC Eagle would be cool, and I think RedBull has a few Suzuki X-90s sitting around. An M35 Deuce And A Half would be fun. A US Mail Truck would probably last forever, and if we go with the semi-trailer concept we would probably want a smaller vehicle on site wherever we park the truck. Current options for this parasitic vehicle include a Nash Metropolitan, a Trabant, a Citroen 2CV, a Renault Dauphine, a Lada, or a Yugo. Yes, they’re all ridiculous but they’re small and can fit in the back of a semi trailer.
It’s still an idea we’re throwing around, but we really need a reason to have a van before we go out and build a hackaspace on wheels, a zombie survival van, or something to launch off some sweet ramps. We don’t go to that many events, and driving a crappy old van across the country a few times a year sounds like fun but surely isn’t.
You can check out [Caleb]’s pitch video for the zombie survival van below.
Filed under: transportation hacks
Let’s say you use an SD card-base portable audio recorder for work – doing an interview, perhaps. Things go well until one day, you turn the recorder off before stopping the recording. Without pressing that big red Stop button, the file doesn’t close, and you’re left with a very large 0kB file on the SD card. How do you get it back? There are tools that will do it for you, but they cost money. You can do it yourself with a hex editor, though, and it’s actually pretty easy.
The software required for this feat of data recovery is Roadkil’s Disk Imager to dump all the bits on the SD card to an image file, the free version of ISO Buster to show the block addresses and length of each file, and the hex editor of your choice. The process starts as simply an experiment for hot to create an MP3 file by cutting and pasting bits into a hex editor. A good file was found in the hex editor, copied to a new file, and played. Everything works so far; great.
For the actual data recovery, a spreadsheet was created to make an educated guess as to where the lost file should be. Starting at this address, about 90MB of data was copied into a new hex editor window. This is where the recovery hit a snag. Because the SD card was plugged into a Mac before, a bunch of data was written on the card. This went into the first available place on the disk, which just happened to be the header of the lost MP3 file.
That’s not a problem; there’s already the header from an MP3 file sitting in a hex editor from the first experiment to see if this was possible. By copying a few hundred bytes to the front of the lost file, the file was corrected just enough that an MP3 player could reconstruct the file.
It’s not perfect – the first fifty seconds of the interview was garbled. The rest of the interview was saved, though, and that’s much better than losing the entire thing. Thanks [Lewin] for sending this one in.
Filed under: software hacks
In case you don’t know, our hacker brethren in Europe are pretty darn sophisticated with their hackerspaces — most of them even implement the Hackerspace API which tells the public when they are open, or closed. This allows them to tap in with hardware to create a fancy notifications for when the spaces are open!
Shackspace, the place to be in Stuttgart, had a nice big map of Europe destined for world domination in their lounge. They thought it could use an upgrade, so have been adding LEDs to represent each hackerspace. They glow green when open, and red when closed. And they built it all in one weekend flat.
If your space is not on the map, start using the Space API and let them know so they can update their project!
Sadly Shackspace in Stuttgart was not one of the hackerspaces we had the pleasure of touring during our European Hackerspace Tour!
Filed under: Hackerspaces
Hackaday, we have a problem. Supplying fresh, healthy food to the world’s population is a huge challenge. And if we do nothing, it will only get more difficult. Rising water prices and (eventually) rising fuel prices will make growing and transporting food more costly. Let’s leverage our collective skill and experience to chip away at this problem. We hope this will get you thinking toward your entry for the 2015 Hackaday Prize.
There are big science breakthroughs that have taken us this far. For instance, The Green Revolution developed wheat with stronger stalks to support the weight of higher kernel yields. If you’re equipped to undertake that kind of bio-hacking we’d love to see it. But the majority of us can still work on ideas to make a difference and (heartwarming moment approaching…) feed the world.
As with the shower feedback loop and electricity monitoring installments of We Have a Problem, I’ll start you off with an uber-simple idea. It’s up to you to think further and wider to get at solutions that are worth more exploration.Can Technology Give Me a Green Thumb?
We see it all the time around here, people are building projects to monitor and control their own gardening projects. The one shown here couldn’t be simpler, it’s a hot-box which lets your gardening continue through the winter. It uses heat tape to keep the soil warm, and features a motorized lid which actuates to regulate humidity and temperature.
This concept is a good one. It doesn’t take up a lot of space and it tackles the easy part of automation (how hot is it? how wet is it?). But does it have the potential to make an impact on the source of your household’s food? Maybe the concept needs to be applied to community garden areas so that you can achieve a larger yield.Robots
Perhaps robots are an answer to a different problem. This little bot, already entered in the 2015 Hackaday Prize, is an experiment with automatic weed elimination versus the use of herbicides.
But it does get us thinking. One of the problems you need to overcome when trying to achieve wide adoption of local food supply is that not everyone enjoys the work that goes into it. Do you have an idea of how your mad robot skills can do the work for us?
Stepping back onto the side-track of changes to industrial farming, let’s take a look at one of the way-out-there-ideas from last year. A huge amount of water usage is in food production. What if we turned entire farms into greenhouses in order to capture and reuse water that is normally lost into an all-to-dry atmosphere? Domes my friends, domes. A swarm of 3D printing robots given locomotion and unleashed to print out translucent covers over the fields on the kilometer-scale. Hey, doesn’t hurt to dream (and do some back of the envelope calculations to gauge how wild that idea actually is).Your Turn
That should be enough to get the conversation started. Toss around some ideas here in the comments, but don’t let the brainstorm stop there. All it takes to enter the Hackaday Prize is an idea. Write it down as a project on Hackaday.io and tag it “2015HackadayPrize” to get your entry started.The 2015 Hackaday Prize is sponsored by:
Filed under: green hacks, Hackaday Columns, The Hackaday Prize
Thanks for another week of great entries in the Caption CERN Contest over at Hackaday.io! We still aren’t sure if our CERN staffer is looking at that machine pensively, amorously, or with a bit of confusion, but you all found some great words to go with the image!
- “Dr. Breman’s early attempts to create the perfect robot woman had some early success, but was later scrapped do to a tragic input/output error.” – Terry Davis
- “You were supposed to be intelligent, my dear. What do you mean by segfault?” –elias.alberto
- “CERN’s pioneering computer dating service didn’t quite work out as expected.” – Nick Johnson
The winner for this week is Stripeytype with the quote seen in the top image of this article. Stripeytype will be sporting a CRT head T-Shirt From The Hackaday Store at their next hackerspace meeting.
We’re not done searching out they mysteries of CERN’s history. Week 9 of the Caption CERN Contest has just begun!
Some of CERN’s experiments take place in the miles of tunnels below their labs in and around Meyrin, on the border of France and Switzerland. It looks like this image was taken in one of those tunnels. It’s definitely an interesting shot. CERN’s documentation for the image has been lost to history, so it’s up to you to explain what’s going on here! Add your humorous caption as a comment to the project log. Make sure you’re commenting on the log, not on the project itself. As always, if you actually have information about the image or the people in it, let CERN know on the original image discussion page.
Filed under: contests
Ah, you thought we were done with our coverage of the Midwest RepRap Festival, didn’t you? No, there’s still more, thanks to [Timothy Koscielny] sending in some digital assets that were required to put this post together. This time, it’s the RepRap roundtable with [Johnny Russell] from Ultimachine, [Shane Graber] from MakerJuice, [Lars Brubaker] from MatterHackers, [Sanjay Mortimer] from E3D-Online.
The first video covers the introductions for these very prominent 3D printer developers and their views on what future advances in 3D printers will be, the differences between Delta, Cartesian, and Polar bots (there aren’t many), and when resin printers will start to pick up.
In the Q&A session, the panel fielded a few questions from the audience. Questions included how to get people into 3D modeling, an amazing question dealing with what we should be making (with the implication that we’re only making stupid plastic trinkets), and what needs work to bring 3D printing to the masses.
Special thanks to [Casey Hendrickson] from ninety two point three WOWO for MC’ing the RepRap roundtable and to [Timothy Koscielny] for the audio work. This isn’t it, though: I still need to dump a bunch of pictures after the break.
While not really having anything to do with 3D printing, a rep from Angstron Materials was at MRRF. What do they do?
We’re well into the well of disillusionment with graphene. Really, all you need to get on the front page of Wired or their ilk is mention graphene. Yes, space elevators, but there’s so much hype. I prefer to take anything dealing with graphene with a grain of salt. That said, the graphene supercap was probably only 20x30x5mm in volume, and if I can do wolfram alpha right, it has about as many mAh as my phone. My phone is crap, but still…
I have some graphene thermal paste. There may be laboratory tests in the future.
Filed under: 3d Printer hacks
A small disk sander is a useful and cheap addition to the shop. For about $100, you can buy a cheap combination 6″ disk/belt sander that’s extremely useful. The size and cost of power tools does not scale linearly, and if you want a big disk sander you might as well make your own.
The motor for this build is a 1kW single phase motor pulled from a floor polisher found in the trash. That’s enough to push a sanding disk around, but when you get to tools this large, you need a good base, good tilt mechanism, and everything should be extremely heavy.
This build meets all those requirements while still using mostly recycled components. The work table is actually made of three pieces of recycled aluminum epoxied together. Yes, you should cringe at this, but it actually makes a little bit of sense: thinner pieces can be cut on a table saw, and if you’re extremely careful during the glue-up, you can cut the mitre slot without a mill. This frame attaches to a frame made from aluminum extrusion and filled with a homebrew epoxy granite mix. Remember, heavy is better here.
In keeping with making a huge disk sander out of stuff pulled out of the trash, the trunnions and motor hub were cast out of aluminum melted in an old propane tank furnace. Once these were cleaned up, a disk was mounted on the hub and trued up in the most unsafe manner possible.
With a few additions including a machined mitre gauge, dust collector, and legs made out of wood that’s far too pretty for a simple shop tool, this huge assemblage of trash turned out to be a great sander. You can see a few videos of it below.
Filed under: tool hacks
If you grew up playing Pokemon Red or Blue, you might have moved far away from your childhood friends by now. If you’re still playing Pokemon Red or Blue, you can now literally reconnect with these friends using [Pepijn]’s new and improved Game Boy link that lets players trade Pokemon over the internet.
Based on [Pepijn]’s previous work building an Arduino-based Pokemon storage system (which was inspired by a separate project that was able to spoof trades), the device allows a Game Boy (including Pocket, Color, and Advance versions) to connect to the Internet via a Teensy shield. The online waiting room software is called TCPoke which facilitates the Internetting of the Game Boys. From there, all you have to do is connect via the project’s wiki!
The TCPoke software is available on the project’s site. Also, be sure to check out the video below which shows a demonstration of how the software works. There is noticeable delay compared to a direct link between Game Boys, but it functions very well. We didn’t see this link system work for a battle, but it would be interesting to see if it is possible. If so, you might never have to go to a Pokemon League meeting again!
Filed under: classic hacks, nintendo gameboy hacks
The Intel Edison is a neat piece of hardware, but the connector for the Edison is extremely intimidating and the Mini breakout board is incompatible with breadboards. What’s [Federico], a builder of Internet of Things to do? Etch their own breakout board.
The Mini Breakout board for the Intel Edison is the official ‘minimal’ offering for getting the Edison up and running with a mess of jumper wires and LEDs. While this breakout board handles the USB to UART bridge, power regulation, and exposes all the pins on the Edison connector, it is terrible for prototyping. It’s a 4×14 array of holes on a 0.1″ grid that are hidden underneath the Edison.
[Federico] handled this problem with a copper clad board and a little bit of ferric chloride. He jumped into Eagle and created a breakout board to turn the 4×14 pin grid into a more sensible breadboard-friendly layout.
The breadboard-friendly adapter doesn’t have level shifters, but by using the mini-breakout board between the Edison and the breadboard adapter [Federico] still has the UART to USB hardware and a battery charging circuit. Still, there’s room for improvement and we can’t wait to see what he comes up with next.
Filed under: Microcontrollers
During a recent trip to Bhutan, [electronut] wished for a device that would show the temperature and altitude at the various places he visited in the Kingdom. Back home after his trip, he built this simple Temperature, Altitude and Pressure Display Device using a few off the shelf parts.
Following a brief search, he zeroed in on the BMP 180 sensor which can measure temperature and pressure, and which is available in a break-out board format from many sources. He calculates altitude based on pressure. The main parts are an Arduino Pro Mini clone, a BMP180 sensor and a Nokia 5110 LCD module. A standard 9V battery supplies juice to the device. A push button interface allows him to read the current parameters when pressed, thus conserving battery life.
Standard libraries allow him to interface the LCD and sensor easily to the Arduino. He wrapped it all up by enclosing the hardware in a custom laser cut acrylic box. The result is bigger than he would like it to be, so maybe the next iteration would use a custom PCB and a LiPo battery to shrink it in size. While at it, we think it would be nice to add a RTC and some sort of logging capability to the device so it can store data for future analysis. The schematic, code and enclosure drawing are available via his Github repository.
Filed under: Arduino Hacks
Although scientists have known about Ultra-High Energy Cosmic Rays (UHECRs) for years, nobody can pinpoint their origin. When these UHECRs hit the ground, however, they cause a widespread local disturbance called an air shower. This air shower is a wide dispersion of photons, muons, and electrons at sea level. The means of observing this air shower mandates a widespread geographic region for detecting them. One solution would be a very big detector. Physicists [Daniel] and [Michael] discovered an alternative to pricey hardware, though. By leveraging the CMOS sensors in our smartphones, they can borrow some CPU cycles on our phones to create a worldwide detector network.
According to their paper, the CMOS camera in our smartphones is sensitive to the spectrum of radiation induced by muons and photons from these air showers. With an app running on our phones, [Daniel], [Michael], and other scientists can aggregate the data from multiple detections in a similar region to better understand their origins.
If you’re concerned about CRAYFIS taking away from your talk or web-browsing time, fear not; it runs in the background when a power source has been detected, hopefully, when you are asleep. It’s not the first time we see scientists tap into our computing resources, but this is certainly an achievement made possible in only the last few years by the sensor-loaded smartphone that charges on many of our night stands. With over 1.5 billion smartphones active in the world, we’re thrilled to see a team cleverly leveraging a ubiquitous and already-well-distributed resource.
Filed under: phone hacks
Here at Hackaday we’ve covered a bunch of DIY laser diode projects. And for good reason, they are just cool. We’ve seen people add lasers to their 3D printers, stick one in a milling machine, use a highly modified scanner and even build a simple XY gantry specifically for the task. To say the least there is definitely a wide range of methods for moving around a laser but we’ve never seen anything like what [Sp4rky] sent in to us. He and his friends outfitted an old educational robot arm with a laser.
The robot arm is a 5 axis Armdroid 5100 picked up from eBay for a couple hundred dollars. It didn’t come with a controller but all of the stepper drivers were housed in the base of the arm. After a little tinkering around with the inputs the team was able to get the arm to move by sending serial commands from a PC, through an Arduino Mega which then sends the appropriate signals to the uni-polar stepper drivers. That was the easy part of the build.
The hard part was getting the arm to hold the laser at a consistent angle and height above the table. Inverse Kinematics to the rescue! Since the desired position of the laser, as well as the length of the arm segments is known, mathematical formulas can be derived to determine the necessary arm segment and joint positions while moving the laser around. The process flow starts out with an image in Inkscape, g-code is then generated with this plugin, then sent to the Arduino running a modified version of GRBL that has the inverse kinematic formulas. The Arduino directly controls the stepper drivers and the robotic arm moves. The Arduino also controls 3 constant-current laser drivers made from LM317 regulators. Three laser drivers, why?
[Sp4rky] got his laser diode modules out of surplus medical equipment and, unfortunately, the rated optical wattage was quite low. Since he had 3 diodes, he decided to try to combine the 3 low power beams into one high power beam. This can be done using a prism. A prism splits sunlight it a rainbow of colors because each wavelength(color) of light that passes through the prism is bent a different amount. Since the laser diodes only put out one wavelength of light, the beam bends but does not split or diffuse. A 3D printed bracket points each laser diode at a 3-sided pyramidal prism which sends the combined beam of light straight out the bottom towards the object to be cut or engraved.
This project is cool enough that we would have covered it even if [Sp4rky] wasn’t burning a Hackaday logo. Although it doesn’t hurt for anyone wanting their project to get covered!
Filed under: laser hacks
[Bob] has his own smoker and loves to barbecue, but doesn’t like spending all day checking on his smoker’s temperature. He thought about building his own wireless thermometer setup, which would have been pretty awesome, but then he had a better idea: why not hack an existing wireless barbecue thermometer? [Bob] purchased an off-the-shelf wireless BBQ thermometer and reverse-engineered its wireless protocol to make his own wireless thermometer setup.
The first problem [Bob] encountered was figuring out the frequency of the transmitter. Thankfully [Bob] had access to a spectrum analyzer, where he discovered the transmitter was running at 433.92MHz (a cheap RTL-SDR dongle would also get the job done). Next, [Bob] started digging into the manufacturer’s FCC filings and found that it actually called out the transmit frequency, which matched the transmit frequency he measured. He also found a ton of other helpful information in the filing, like a block diagram and full transmitter schematic.
[Bob] used a Radiometrix RF module to receive the thermometer’s signal. He hooked up the output to his logic analyzer to start decoding the protocol. After a quick visual analysis, [Bob] found that the signal was a preamble followed 13 bytes of Manchester-encoded data being transmitted at 2kbps. He started collecting data with known temperatures, created a table of the data, and began looking for patterns. After quite a bit of searching [Bob] was successfully able to find and parse the temperature values out of the data stream. [Bob] did a great job of documenting his process and results, so check out his writeup if you want to try it out yourself.
Filed under: wireless hacks
With the human URL [will.i.am] serving as Chief Creative Director of 3D Systems, and [Martha Stewart] selling her own line of 3D printer filament through MakerBot, more and more celebrities are piling onto the hacker, maker, and DIY revolution. Now, the partnership we’ve all been waiting for: the Raspberry Pi Foundation and [The Artist Formerly Known As ] are teaming up to produce a line of Pi-based wearable electronics. The first product from this new, fashionable line of electronics is beyond anything you would expect. It’s called the Raspberry Beret, and it’s shaping up to be a Revolution in wearables.
The wearable Raspberry Beret is exactly what you would expect: a habadasher’s masterpiece that pairs equally well with figure skating costumes and skin-tight cloud print suits. Inside, though, is a new piece of hardware based on the Raspberry Pi compute module. This module includes a Bluetooth module that will sync with any Windows phone. The Raspberry Beret also includes enough sensors that will blow away everything from a Fitbit to the new Apple Watch. The Raspberet will keep track of your heart rate, activity, and exercise routine.
The Raspberry Beret is just the beginning; the Pi Foundation and [The Artist Formerly Known As ] are also teaming up with OSH Park to produce a limited, special edition Raspberry Pi 2. This board will be clad in the beautiful OSH Park purple soldermask and sports 4GB of eMMC Flash. This Flash will not be usable; instead it will contain a remastered edition of Purple Rain that will play as a startup chime. There will be no option to skip the chime.
Filed under: Raspberry Pi, slider, wearable hacks