The world has a severe lack of robots, and the shortage of walking robots is untenable. We were promised flying cars and fusion reactors, yet here we are, 15 years into the twenty-first century without even a robotic pet spider.
[Radomir]’s entry for The Hackaday Prize aims to fix this bizarre oversight of scientific and technological progress. He’s designed a small, inexpensive, but very well designed quadrupod robot that will put full reverse kinematics on your desk for under $50.
To solve humanity’s glaring lack of walking robots, [Radomir] designed Tote, a four-legged robot whose chassis is mostly composed of only 9 gram servos. There are twelve servos in total, three on each of its four legs. It’s an extension of his earlier µKubik robot. While the µKubik was powered by Python, the Tote is all Arduinofied, calculating the trajectories of each leg dozens of times a second with an Arduino Pro Mini.
This isn’t the only walking robot kit on hackaday.io; last year, [The Big One] created Stubby the Teaching Hexapod. Even though Stubby featured six legs, it’s still remarkably similar to Tote; 9 gram servos provide all the locomotion, and all the software is running on a relatively small ATMega microcontroller. Both are great introductions to walking robots, and both bots will surely be capable and just rulers of mankind after the robot apocalypse.
There are a lot of neat toys and accessories that rely on 3D printing filament. The 3Doodler is a 3D printing pen, or pretty much an extruder in a battery-powered portable package. You can make your own filament with a Filastruder, and of course 3D printers themselves use up a lot of filament. [Bodet]’s project for this year’s Hackaday Prize gives those tiny scraps of leftover filament a new life by welding filament together.
The EasyWelder [Bodet] is designing looks a little bit like a tiny hair straightener; it has a temperature control, a power switch, and two tips that grip 1.7 or 3mm diameter filament and weld them together. It works with ABS, PLA, HIPS, Nylon, NinjaFlex, and just about every other filament you can throw at a printer. By welding a few different colors of filament together, you can create objects with different colors or mechanical properties. It’s notas good as dual extrusion, but it does make good use of those tiny bits of filament left on a mostly used spool.
Since the EasyWelder can weld NinjaFlex and other flexible filaments, it’s also possible to weld NinjaFlex to itself. What does that mean? Custom sized O-rings, of course. You can see a video of that below.
The Zero to Product workshop, held at the Hackaday Design Lab in Pasadena two weeks ago, was a packed house of talented people seeking to expand their skill set with professional PCB layout tips and tricks. [Matt Berggren] didn’t disappoint, bringing his professional experience to the table in a way that anyone with basic electronic knowledge can grasp. Learning the things that make a board reliable and manufacturable can be done with a simple design. In the case, the culmination of the workshop is development board to host the ESP8266 WiFi modules that have been so popular over the last half-year.
This isn’t the first time we’ve pulled off a massive hardware hackathon and meetup, and it certainly won’t be the last. You have another chance to participate in the workshop in San Francisco on June 13th. If you can’t catch that one, we’ll be in Shenzhen for the Shenzhen Maker Fare, a Zero to Product workshop, and a meetup.
The completed ESP8266 breakout presented during the talk
Of course Hackaday events are never “all work and no play”. The day crept into night and the the chairs were cleared out for hightop tables and tasty beverages. The atmosphere was festive and everyone still made it back early the next morning for an entire day of hardware hacking, tinkering, and general futzing around with circuits and electrons. If you check out [Rich Hogben]’s photo log of the weekend, you’ll find some an impressive collection of hackers were there. I see at least one person who’s job is flying space probes, a Hackaday Prize judge, and a security researcher who can crack a Master Lock in 30 seconds.
The display for [Steve]’s LIDAR
Bar-time Show and Tell
The meetup Saturday night wasn’t technically a bring-a-hack event, but we walwasy want to see people’s latest and greatest contraptions. [Steve Collins] brought a homebrew LIDAR. This project was based on a SparkFun Time of Flight breakout board that scans the room with a cheap hobby servo, reads the data into an Arduino and displays the rangefinding data on a small TFT. The LIDAR is good enough to scan the entire Hackaday Design Lab, with more than enough resolution for any robotics project you have in mind.
Also at the Saturday night gathering was our very own mythical creature [Sophi Kravitz], [Elecia White] who is and embedded.fm podcaster, engineer, and Hackaday Prize judge two years in a row, and [Samy Kamkar] known for his privacy and security research and for building the KeySweeper. They gave a series of lightning talks about the latest things they’re working on:
We rented Galaga and Ms. Pac Man machines for the entire weekend, but that wasn’t the only electronic entertainment for the party. Two Bit Circus was there with a game that could only be described as highly disorganized electronic chess. FLED, the exceedingly large, high-resolution RGB LED display was behind the bar, and Deezmaker took over a room to 3D scan people and print out miniature clones on a pair of 3D printers.
The Hackathon
The events continued on until Sunday evening with a hardware hackathon. This isn’t your run-of-the-mill software hackathon where people sit behind their MacBooks the entire time; we had soldering irons, components, solder, solder wick (important!) and dozens of hardware hackers tinkering away at their latest electronic doodad.
Foreground: A moisture vaporatorA vast assortment of dev boards
The amount of hardware on hand was spectacular. Hackaday Prize sponsors Atmel, Freescale, Microchip, and TI all provided some hardware. Everything from ATMega328 boards from Atmel, TI Launchpads bristling with goodies like the Sharp Memory Display booster packs, Seeed Studio starter packs, to insanely powerful Freescale Freedom boards were available to build on at the event. The Sunday hackathon also had several gigantic boxes from Mouser filled to the brim with components and breadboards available to everyone to clobber into submission, letting their inner electronics geek shine. When taking a break from the build there was plenty to look at. People were showing off already completed projects they brought along with them. [Jeff] from Circuitry & Poetry was there with a bunch of circuit bent synths. A number of people were also finishing up the ESP8266 breakout boards that were presented the day before; some soldering and some laying out a PCB in Eagle. It was an incredible event, with dozens of groups going off to do their own thing, but still welcoming to anyone else who wanted to tinker. This type of community isn’t found everywhere and we’re thankful for the people that make Hackaday events like this one so special.
We need to take the time to give a big shoutout to SGVHAK. We honestly couldn’t have done this event without them. I’d personally like to thank [Michael Proctor-Smith] for bringing his amazing livestreaming box. He is the reason I am not currently (still) editing down seven hours of video from the PCB design workshop and the lightning talks. Big ups to [Lan], [Scoops] and everyone else who helped out. If you came to the Hackaday event, check out their meetups. If you’re in the area, we also have regular informal meetups somewhere around the hackerspace. Come on out!
The theme of this year’s Hackaday Prize is. ‘build something that matters.’ A noble goal, but there’s also a second prize – the Best Product prize – that is giving $100k to one lucky team who can appeal to people with open jaws and wallets. It’s a fabulous prize that also includes a six month residency at the Hackaday Design Lab, but right now there aren’t many contenders for this part of The Hackaday Prize.
[drewrisinger]’s DrDAC USB Audio DAC is one of those project that’s in the running for the Best Product prize. He’s solving the problem of terrible low-quality built-in soundcards that seem to be everywhere. Yes, it’s a simple idea, but the execution is great.
The electronics for DrDAC are pretty much what you would expect for a DIY audio sound card; A PCM2706 takes USB audio and sends it out over I2S. A PCM1794 converts the I2S to analog audio, and an OPA2836 amplifies it and sends everything out through a 1/8″ jack or a pair of RCA plugs.
[drewrisinger] started DrDAC as a school project, and after receiving the PCBs, he noticed a problem. MultiSim’s footprint for a TQFP-32 package was too small, meaning the IC simply wouldn’t fit on the board. It was too late in the semester to order a new board, meaning some sort of rework needed to happen. [drew] fixed this problem by soldering jumper wires between the pads to the leads of the chip. Yes, it looks crazy, but apparently it works. You can check out a video of that whole process below.
As with all devices meant for a very small percentage of the population, computing equipment for the blind is very, very expensive. A Braille typewriter – a relatively simple machine that puts dots on a piece of paper – costs about $700 USD. Need a Braille interface for a computer? You can buy a 16-cell wide Braille output for $1600, and high-end models with an integrated keyboard go up to $5000.
For his Hackaday Prize entry, [Haydn Jones] is building a simpler and cheaper Braille computer. It’s not just a single line of text at a time; this computer will have a display that will output an entire page of Braille at a time.
The current solutions for a computer to Braille interface use small electromechanical cells for each character. That’s six individual pins for each character, multiplied by the number of cells on the display. Doing a full-page display with this type of mechanism, but [Haydn] has another idea. Instead of controlling each pin individually, all of the pins on the display will be controlled by a CNC-like mechanism. The pins themselves will be mechanical SR latches, better known as the mechanism in a ball point pen.
A display is only half of the IO of a computer, and for the input portion of his build, [Haydn] is also building a Braille keyboard. This doubles as a binary or hexadecimal keyboard, but the idea is very similar to a proper chorded Braille keyboard. It’s a simple enough build; just a few key switches and a microcontroller.
If you’re entering something in The Hackaday Prize this year, [Peter Jansen] is a guy you need to watch out for. Last year, he won 4th place with the Open Source Science Tricorder, and this year he’s entering a homebrew MRI machine. Both are incredible examples of what can be built with just enough tools to fit on a workbench, but even these builds don’t cover everything [Peter] has built. A few years ago, [Peter] built a desktop CT scanner. The CT scanner worked, but not very well; the machine takes nine hours to acquire a single slice of a bell pepper. At that rate, any vegetable or fruit would begin to decompose before a full scan could be completed.
This didn’t stop a deluge of emails from radiology professors and biomedical folk from hitting [Peter]’s inbox. There are a lot of people who are waiting for back alley CT scans, but the CT scanner, right now, just isn’t up to the task. The solution is iteration, and in the radiology department of hackaday.io, [Peter] is starting a new project: an improved desktop CT scanner.
The previous version of this CT scanner used a barium check source – the hottest radioisotope source that’s available without a license – and a photodiode detector found in the Radiation Watch to scan small objects. This source is not matched to the detector, there’s surely data buried below the noise floor, but somehow it works.
For this revision of a desktop CT scanner, [Peter] is looking at his options to improve scanning speed. He’s come up with three techniques that should allow him to take faster, higher resolution scans. The first is decreasing the scanning volume: the closer a detector is to the source, the higher the number of counts. The second is multiple detectors, followed up by better detectors than what’s found in the Radiation Watch.
The solution [Peter] came up with still uses the barium check source, but replaces the large photodiode with multiple PIN photodiodes. There will be a dozen or so sensors in the CT scanner, all based on a Maxim app note, and the mechanical design of this CT scanner greatly simplifies the build.
Compared to the Stargate-like confabulation of [Peter]’s first CT scanner, the new one is dead simple, and should be much faster, too. Whether those radiology professors and biomed folk will be heading out to [Dr. Jansen]’s back alley CT scan shop is another question entirely, but it’s still an amazing example of what can be done with a laser cutter and an order from Mouser.
Quadcopters show a world of promise, and not just in the mediums of advertising and flying Phantoms over very large crowds. They can also be used for useful things, and [Sagar]’s entry for The Hackaday Prize does just that. He’s developing a 3D mapping drone for farmers, miners, students, and anyone else who would like high-resolution 3D maps of their local terrain.
Most high-end mapping and photography work done with quadcopters these days uses heavy DSLRs to record the images that are brought back to the base station to be stitched into a 3D image. While this works, those GoPros are getting really, really good these days, and with 4k resolution, too. [Sagar] is mounting one of these to a custom quad and flying around an area to get images of an area from every angle.
To stitch the images together [Sagar] will be using the Pix4D mapping software, an impressive bit of software that will convert a multitude of still images to a 3D scene. It’s an expensive piece of software – $8500 for a perpetual license, but the software can be rented for $350/month until a FOSS alternative can be developed.
![The display for [Steve]'s LIDAR](https://hackaday.com/wp-content/uploads/2015/05/lidar1.jpg)
