Loyal J made a cool USB pinball controller, Pinbox Jr, to use on your PC.
The Pinbox JR is a USB controller that gives PC games the feel of playing on a real pinball table. It interfaces with a PC as a USB keyboard and maps the pinball buttons to various keys on the keyboard. The latest version of the Pinbox Jr includes an accelerometer to simulate the tilt feature if you shake the controller.
This small tactile keyboard is super to use with handheld projects. It has 60 keys arranged in a QWERTY layout and number keys arranged in a number pad layout. The board has beginner friendly through hole soldering with a Teensy, 60 pushbuttons, and 10 zener diodes.
Anthony used this thumb board to make a handheld Raspberry Pi. Using the Teensy he was able to add backlight control and low batter monitoring in addition to controlling the keyboard.
This crazy adventure started with Kickstarter reached out to me, only 6 weeks before Maker Faire, looking to showcase 4 successful projects in their booth. They wanted to show “creative tools” and how people used them. So I reached out to a few synthesizer folks I’ve met and who’ve used Teensy. They also suggested bringing it to Tested to make a video. So it began…
From the beginning I had a step sequencer using illuminated arcade buttons in mind. So I quickly designed this little I/O expander board and sent it off to OSH Park’s Super-Swift service.
The whole project came together over just 4 weeks. Our first meetup was just to discuss what to build, followed a week later by our first build night. By then the I/O expander boards had arrived. We made not the final Monolith, but 3 breadboard prototypes, so the software development side could begin!
Another meetup focused only on software. Almost all the software was developed on these prototype panels.
In this picture you can also see the panel layout sketches on the notepad on the right side, and a blue tape model underneath on the table, which we made to get an idea of the overall size.
Ross and Darcy had synthesis plans that needed a signal-controlled PWM waveform and improvements to the envelope feature, so I worked on improvements to the Teensy Audio Library while they wrote the Arduino sketch code.
The day before our next meetup, I started turning those sketches into a design for the laser cutting. I made this 1/4 scale model of the front and side pieces. At this point, none of the back side or interior ribs (for strength) had been designed, and you can see the model lacks the many holes for screws & brackets which joined everything.
Only 2 weeks before Maker Faire we had an epic 13-hour build day where all the final parts were laser cut and assembled. Here’s a photo of Darcy & Ben putting the panels together on my kitchen counter!
All the clear acrylic plastic parts were completely drawn, with all mounting holes, and made that day.
Here’s the complete layout of all parts (mk2017_design):
While the laser did most fabrication work, other steps like countersinking for the potentiometers were needed. It was indeed an epic 13 hour day of making.
A couple days later, I spent a whole day completing the wiring we couldn’t get done in those 13 hours. Erin Murphy (the “Soldering Goddess” at PJRC) put in a few hours on aesthetic improvements to the messy tangle of wires from so many buttons.
Just a few days later we had our last “build” session, to get the 3 separately written Arduino sketches merged and working together as one integrated project. Even though everything has been designed to go together, this session went very late. Ben did much of the heavy lifting to merge the 3 programs.
This is the final audio DSP system settled upon that late night.
This was the first actual usage of the Monolith, well past 1am when we finally had it all up and running.
The next day I took it all apart and packed all the pieces and spare parts into these 2 big boxes, weighing in at 55 and 40 pounds!
This is the first time I’ve ever shipped a project to Maker Faire, rather than driving a truck or hauling cases of checked baggage on a plane. So much easier, and it allowed time to work on a nice handout card. After some back and forth with the others and last-minute proof reading by Robin, who caught what would have been embarrassing typos and grammatical errors, we sent this card off to be fast-turn printed.
Darcy and I flew to San Francisco early and spent the day with Tested, putting it back together while they shot that awesome video. Sometime I hope to have even 1/10th that sort of video production skill.
Since it was already put together, we had little to do setup-wise. Friday morning Ben, Ross and Darcy did some adjustments of the sound levels which really made it come to life in the space. For anyone who wishes to dig deeper into the technical details, the complete source code is available on Github.
During the 3 days of Maker Faire, things went very well. We did experience a couple minor issues. Massive electrical noise from so many other projects played havoc with the capacitive touch sensing. Saturday evening I rewrote the code to look for changes from an average rather than just an increase from a threshold, which allowed it to usually work well enough. The other tech issue was a bass. When turned up louder, the bass notes would shake all the plastic panels, rattling screws and even some of the connectors loose at time. Easy to fix.
Towards the end of Sunday, the Maker Faire folks came around and gave up an award. At first I shrugged it off, since they’ve done the same for other stuff I’ve brought in prior years. But those were the blue ribbons. Apparently the only hand out one of these red one each in “zone”. They said it’s a big deal…
Really, the best thing about this year was working with a great team. Ross, Darcy and Ben really stepped up and did a great job on so many parts.
Shortly after Maker Faire 2017, this article was posted to the DorkbotPDX website. Since that time, the DorkbotPDX blog section has vanished. We’re reposting it here, to preserve this project’s history. A copy of the original can also be found at the internet archive.
The tutorials are targeted at people who have a basic knowledge of Rust and “lightweight” embedded development experience. The first tutorial covers bootup of the processor to getting the LED to blink – with a good number of topics covered in between. Parts two and three go on to cover serial communication and hardware allocation. Each of the tutorials has quite a lot of information and detailed explanations of a number of topics important in embedded development. Overall this series is a great way to get going on programming Teensy using Rust.
Branan has indicated that the next tutorial in the series will cover DMA (Direct Memory Access) and interrupts will be in another upcoming tutorial
Update on the Teensy/rust stuff: DMA as a Future works! And I think I've convinced myself it's safe! I wanted to do interrupts, but I might save those for another post. That means I'm really ready to finish the prose and get it up!
The coat features 673 WS2812 LEDs driven by a Teensy 3.2, Prop Shield, and an ADMP401 MEMS microphone. It’s powered bu 2 5200mAh lipo batteries. It includes some user controls to change the pattern, sound reactivity, and overall brightness.
The goal of the project was to come up with something small, affordable, and buildable in just a few hours. The result was this portable, battery-powered drum machine.
While this drum machine may be small in size, it’s not small on features. It has 4 voices (kick, tom, snare, and hat) and 4 parameter controls per voice – pitch, decay pitch modulation, and distortion. A 9V battery will power this little guy for up to 7.5 hours. More information on the features can be found on this GHZ LABS page.
Tomash put some great documentation together so that you can build your own. A manual, schematics, bill of materials, gerber files, and firmware are all available on this GitHub page.
Watching people use the Surface studio has been interesting. It seems to have some great potential, but functionality with most software programs is lacking and seems to make the Surface awkward to use.
This project is a great example of using Teensy and some DIY ingenuity to improve usability.
Designing a PCB from the comfort of your couch seems pretty enticing. Maybe DIY projects like this one can make this a reality.