Month: July 2016

What Could Go Wrong? I2C Edition

July 19, 2016 by 53 Comments

I should really like I2C more than I do. In principle, it’s a brilliant protocol, and in comparison to asynchronous serial and SPI, it’s very well defined and clearly standardized. On paper, up to 127 devices can be connected together using just two wires (and ground). There’s an allowance for multiple clock-masters on the same bus, and a way for slaves to signal that the master needs to wait. It sounds perfect.

In reality, the tradeoff for using only two wires is a significantly complicated signalling and addressing system that brings both pitfalls and opportunities for debugging. Although I2C does reduce the number of signal wires you need, it gets dangerous when you have more than a handful of devices on the same pair of wires, and you’re lucky when they all conform to the same standard. I’ve never seen twenty devices on a bus, much less 127.

But still, I2C has its place. I2C was designed to connect up a bunch of slower, cheaper devices without using a lot of copper real estate compared to its closest rival protocol: SPI. If you need to connect a few cheap temperature sensors to a microcontroller (and their bus addresses don’t clash) I2C is a great choice. So here’s a guide to making it work when it’s not working.

Continue reading “What Could Go Wrong? I2C Edition” →

Hackaday SuperConference: Call For Proposals

July 19, 2016 by 1 Comment

The 2016 Hackaday SuperConference is coming. Now is the time to submit your proposal for a talk or a workshop at the world’s greatest conference about hardware creation. The SuperCon is an unparalleled opportunity to present on a deeply technical level where you can be certain everyone in the audience is following. All of those details, the war stories of production, the out-of-stock problems and board respins, the moments when you’ve bent physics to your will, these stories will be met with awe and cheers as the audience of your peers takes the ride along with you.

SuperCon will take place in Pasadena, California on November 5th and 6th, 2016. It is a gathering of hackers, designers, and engineers passionate about learning, teaching, and celebrating what goes into making new and exciting creations. The atmosphere will be that of a hacker village, with several venues in close proximity playing host to talks, workshops, and other activities. This breaks out of the beige prison that usually accompanies hotel-based conferences and opens the weekend up for you to meet and interact with a cadre of interesting people. SuperCon is the place to share your hard-won knowledge and experience, and to add to your own arsenal of skills.

Accepted talks will be scheduled for 20-40 minutes, and workshops will be booked for 1-4 hours. In both cases, topics may include themes like techniques for rapid prototyping, new and interesting uses of technology, creativity in technical design, and stories of product development and manufacturing.

Last year’s SuperConference was incredibly successful. If you weren’t able to attend you can still work your way through all of the talks which were recorded and posted shortly after the event. That success is a credit to all of the talented presenters in the Hackaday community who put together their stories to share for the benefit of all. Thank you!

To all of you reading this now and wondering if you should propose a talk, you should! We thank you in advance for taking time out of your life to make this year’s SuperConference even more amazing by submitting your own proposal. It won’t happen without you because this is a conference of active involvement and not one of passive consumption. Be the hardware movement; this is your chance.

New Part Day: ST’s 32-Bit 3D Printer Controller

July 19, 2016 by 57 Comments

There are a few 32-bit ARM-based 3D printer controller boards out there such as the Smoothieboard, the Azteeg X5 mini, [Traumflug]’s Gen5 electronics, whatever board is in the Monoprice MP Mini Select, and several others I will be criticized for not mentioning. All of these ARM boards provide smoother acceleration, better control, and ultimately better prints from whatever 3D printer they’re controlling. Now, out of the blue, there’s a new board. It’s an evaluation board from ST — much like those famous Discovery boards — that sells itself as a plug and play solution for 3D printers.

The heart of this board is an STM32F401 — not the king of the STM32 line or the fastest ARM microcontroller, but anything faster or more capable will add considerably more to the BOM for this board. This controller board features six of ST’s L6474 motor drivers with enough current for some beefy NEMA 23 stepper motors , a multi-zone heated bed, and connections for a WiFi module and external LCD and keypad. You can buy this board right now for $118. This board isn’t a game changer, but it is evidence the game has been changed.

As with all 3D printer controller boards, there are a few aspects that will leave users wanting more. This is a board meant for 12V heaters (except for the bed, which has a 24V, 20A output), and the stepper drivers can only go up to 16 microsteps. That said, there’s not much else to complain about. This offering comes with a 32-bit firmware called Marlin4ST. From a quick perusal, it looks like the familiar configuration.h is still there, and still does what it’s supposed to do.

This ST Discovery board is extremely capable, available now, and relatively cheap, but that’s not really the big story here. What this board represents is a reference design and working firmware for a 32-bit ARM-based printer controller. That’s the future, and with this board the future might come a little sooner.

Thanks [jagerboots] for sending this one in.

Hackerspaces Are Hard: Insurance

July 19, 2016 by 48 Comments

Do you dream of opening a hackerspace, makerspace, or co-working space? Maybe it’s in the works and you’re already scoping out locations, intoxicated by visions of all the projects that will emerge from it. Here’s a sobering thought: makerspaces are a great big pile of risk. If the doors of your ‘space are already open, perhaps you’ve come to realize that the initial insurance policy you signed doesn’t really fit the needs of your particular creative paradise. Even if it does, the protection you need will change as you acquire new toys.

So why should you even get insurance? For one thing, your landlord will probably require it. If you own the building, you should insure it to protect yourself and anyone who uses the space. Do it for the same reason you’d insure a car, your house, or your collection of vintage pinball machines: to mitigate risk. It takes a lot of hard work to open a makerspace, perform the day-to-day operations, and keep it growing and getting better. Whenever the unthinkable happens, insurance will protect your investment as well as the people who make it a great place to be.

In researching this article, I contacted several well-established makerspaces in the United States as well as most of the major insurance providers to get both sides of the story. My intent was not to make a how-to guide, but to simply explore the topic and provide a view of the process and the struggle.

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Never Gonna Give Up Free WiFi

July 19, 2016 by 44 Comments

Our conscience almost prevented us from posting this one. Almost.

What do people all around the world want most? Free WiFi. And what inevitable force do they want to avoid most, just after death and taxes? Rick Astley. As a getting-started project with the ESP8266, Hackaday.io user [jaime] built a “free WiFi portal” that takes advantage of people’s deepest desires. Instead of delivering sweet, high-bandwidth connectivity, once you click through the onerous terms and conditions, it delivers you a looped GIF with background music.

And all of this on $4 worth of hardware, with firmware assembled in the cloud and easily available to anyone. We live in a truly frivolous glorious age.

Digging through our archives, we found a number of Rickroll posts that we’d rather forget, but this steam-powered record player bears a second look.

Pokemon Go GPS Cheat (If You Don’t Fear Getting Banned)

July 19, 2016 by 75 Comments

Pokemon Go inherits a certain vulnerability to GPS location spoofing from it’s predecessor Ingress, but also the progress that has been made in spoof detection. Since taking advantage of a game’s underlying mechanisms is part of the winner’s game, why not hook up your smartphone to Xcode and see if you can beat Niantic this time? [Dave Conroy] shows you how to play back waypoints and activate your Pokemon Go warp drive.

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Hackaday Prize Entry: What The Flux

July 18, 2016 by 9 Comments

Electromagnetism is the most difficult thing teach. Why is electromagnetism hard to teach? Well, when you’re asking a ‘why’ question (obligatory Richard Feynman video)…

[Adam Smallcomb] might not be able to explain electromagnetism with perfect clarity, but he does have an idea to give students a hands-on feel for electrons and magnets. He’s building an Electromagnetic Teaching Aid that turns 30 gauge wire, springs, Lego, and bits of metal into a toolset for understanding magnets, solenoids, current, and magnetic fields.

The devices explained via [Adam]’s toolkit include a DC motor, stepper motor, speaker, solenoid, relay, transformer, microphone, and generator. That’s not to say [Adam] is building all these devices – a DC motor is just a generator in reverse, a relay is a solenoid with more electrical connections, and everything in this toolkit is basically just wire and magnets.

So far, [Adam] has a bunch of interesting applications for magnets, wire, and Lego including a DIY stepper motor and a nifty little tool that measures magnetic flux with a Hall effect sensor. Will it teach schoolkids electromagnetism? Very few things could, but at least this little toolkit will allow students to intuit electromagnetism a little better.

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