Hands On With The Odroid C2; The Raspberry Pi 3 Challenger

March 16, 2016 by 116 Comments

A couple of weeks ago we covered the launch of the Odroid C2, a single board computer from the Korean company Hardkernel in the same form factor and price segment as the Raspberry Pi 3. With four ARM Cortex A53 cores at 2GHz and 2Gb of DDR3 on board it has a paper spec that comfortably exceeds that of the Pi 3’s 1.2GHz take on the same cores and 1Gb of DDR2. This could be a board of great interest to our readers, so we ordered one for review.

The parcel from Korea arrived in due course, the C2 in its box inside it well protected by a sturdy cardboard outer packaging. We had ordered a couple of extras: a micro-SD card preloaded with Ubuntu and a USB power lead (more on that later), both were present and correct.

When unpacking the board it is immediately obvious how closely they’ve followed the Raspberry Pi form factor. There are a few differences, no camera or DSI connectors, the SD card in a different place, a power jack where the Pi has its audio jack, and oddly the network port is the other way up. Otherwise it looks as though it should fit most Pi cases. Of course the only case we had to hand was a PiBow which are cut for specific Pi models, so sadly we couldn’t test that assertion.

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Hackaday In Dallas — And What That Means For Your Weekend

March 16, 2016 by 12 Comments

The Hackaday Prize meetup at the Dallas Makerspace is this weekend: Saturday March 19th. We will be kicking things off at 7pm with food and drinks followed by lightning talks. If you want to come but have yet to RSVP you can do that via Meetup, please do this so we can have enough food and drinks on site for everyone.

We’ve already lined up a number of lightning talks (5-7 minutes each) to get things started so we aren’t sitting and staring at one another like a junior high dance. But we encourage you to show up and sign up for one on on the night of the meetup. Even if you don’t give a talk you should bring a project to show off afterward.

Lightning Talks Primed With:

CROPED_bradley_HV
450V 1mA PIC boost converter by [Bradley Mahurin]
[Brandon Dunson] giving a talk about the 2016 Hackaday Prize, [Mike Szczys] will be giving a talk about the Hackaday | Belgrade hardware badge. [Dave Anders] will be talking about his WITCH-E Project and [Bradley Mahurin] is bringing his 450V 1mA PIC based boost converter. Not to discredit the Hackaday talks, but I’ve seen [Dave] and [Bradley]’s work before and you’ll want to see this stuff first hand and get a chance to talk with these guys.

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ARM Board Transmits FM

March 16, 2016 by 27 Comments

There is more than a casual link between computer people and musicians. Computers have created music since 1961 when an IBM7094 sang the song Daisy Bell (later inspiring another computer, the HAL 9000, to do the same).

[Vinod.S] wanted to create music on an STM32F407 Discovery board, but he also wanted it to play on his FM radio. He did it, and his technique was surprising and straightforward. The key is that the ARM processor on the Discovery board uses an 8MHz crystal, but internally (using a phase-locked loop, or PLL) it produces a 100MHz system clock. This happens to be right in the middle of the FM radio band. Bringing that signal back out of the chip on a spare output pin gives you the FM carrier.

That’s simple, but a carrier all by itself isn’t sufficient. You need to FM modulate the carrier. [Vinod.S] did the music playback in the usual way and fed the analog signal via a resistor to the crystal. With some experimentation, he found a value that would pull the crystal frequency enough that when multiplied up to 100MHz, it would produce the desired amount of FM deviation. You can see a video of the whole thing in action, below.

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Hacker Straightens Own Teeth

March 16, 2016 by 49 Comments

So you say your wonky smile has you feeling a bit self-conscious? And that your parents didn’t sock away a king’s ransom for orthodontia? Well, if you have access to some fairly common fab-lab tools, and you have the guts to experiment on yourself, why not try hacking your smile with DIY braces?

First of all: just – don’t. Really. But if you’re curious about how [Amos Dudley] open-sourced his face, this is one to sink your teeth into. A little research showed [Amos] how conventional “invisible” braces work: a 3D model is made of your mouth, each tooth is isolated in the model, and a route from the current position to the desired position is plotted. Clear plastic trays that exert forces on the teeth are then 3D printed, and after a few months of nudging teeth around, you’ve got a new smile. [Amos] replicated this hideously expensive process by creating a cast of his teeth, laser scanning it, manipulating the teeth in 3D modeling software, and 3D printing a series of intermediate choppers. The prints were used to vacuum mold clear plastic trays, and with a little Dremel action they were ready to wear. After 16 weeks of night and day wear, the results are pretty amazing – a nicely aligned smile, and whiter teeth to boot, since the braces make great whitening trays.

Considering how badly this could have turned out, we’ve got to hand it to [Amos] for having the guts to try this. And maybe he’s onto something – after all, we’ve advocated for preemptive 3D scanning of our bodies recently, and what [Amos] did with this hack is a step beyond that.

[LupusMechanicus], thanks for the tip!

CitizenWatt And The Power Of Community

March 15, 2016 by 28 Comments

Depending upon where you live in the world, the chances are that your national or local government, or your utility company, has smart meters on their agenda. The idea is that these network-connected energy meters for your gas and electricity supply will allow greater control of energy usage and lead to lower costs through more efficient use of that energy. Bold plans have been advanced for meters that exert control over your higher-power appliances such as water heaters, washing machines, or home heating systems, able to turn them off or on depending on the time of day, spot price of energy, or load on the grid as a whole.

These devices are not without controversy though. Privacy concerns for example, centred on the amount of information about individuals that could be gleaned from the data they collect. Or security, that a vulnerability in an internet-connected electronic device fitted to millions of homes and with control over high-power appliances could be catastrophic if successfully exploited.

In a small area of Paris, they are trying to reap some of the benefits of smart meters for a community without some of those risks. CitizenWatt (French language, Google Translate link) is an open-source smart energy monitor that provides some of the benefits of a smart meter while allowing its owner to retain control of the data it generates by sharing data only with their consent. The entire project was born of an association between Citoyens Capteurs (Citizen Sensors, French language, Google Translate link), the hackEns (French language, Google Translate link) hackspace, the Fabelier FabLab, and the City of Paris.

The CitizenWatt system comprises an electricity sensor and a base station. The sensor is a simple battery-powered device that takes the output from a current transformer clamped onto the electricity supply cable and feeds it via an ATMEGA8 microcontroller to a 2.4GHz RF link. The base station is a Raspberry Pi which retrieves the data from the RF, stores it, and allows the user to view it through a web interface. Both the sensor code and hardware files, and the files for the Raspberry Pi base station are freely available on GitHub.

In keeping with the open nature on their project, the CitizenWatt team organised a series of events at which the families who were part of their trial in a Paris suburb were given the chance to build their own sensor boards, for many of them the first time they had handled a soldering iron.

We have seen quite a few smart meters on these pages over the years. There is this one based on a Spark Core, this one based on an ESP8266, and this one provided by a utility company, the data of which can be accessed. CitizenWatt is a worthy project to join them in its own right, but its involvement of a local community of non-makers is what sets it apart. We applad this aspect of the project, and we wish we saw more like it.

Upgrade The Graphics On A Sega Game Gear To Mental

March 15, 2016 by 23 Comments

[Nino K] built a portable game player for text adventures. He decided he had spent enough time with the ATmega328 kit from NerdKits to build a more advanced project.

To start with, he built a prototype PCB and tested out the concept. It worked so he began on the real thing. He tore out the guts from a broken Game Gear, saving some parts like those responsible for supplying power. Impressively, he etched his own replacement boards for the Game Gear’s control pads; surprising himself at how simple it ended up being. He fit a 16×4 LCD into the space previously occupied by the Game Gear’s screen.

The program itself is a simple text adventure of his own creation. He even added little 8-bit sprites. The story is classic, a princess has gotten herself in some trouble and a brave hero has been coerced into saving her. Last, he added some music and sound effects from Zelda with a piezo buzzer.

This project is guaranteed to disappoint a visiting younger cousin or relative, but we like to think of that as a feature and not a bug. Great work!

Pick Locks Like In The Movies: Using A Bobby Pin

March 15, 2016 by 44 Comments

Sure, many of us don’t hold our hair in place with bobby pins, but just in case we need to break into a secure location, like the broom closet we locked ourselves out of, it wouldn’t hurt to know how to use them to pick a lock.

There are worse things you can make a lockpick set out of. After you’ve secured two bobby pins, one for the tension wrench and one for a small hook pick. To make the small hook simply flatten the pick and remove the rubber cap from the side without waves; this is the small hook. To make the tension wrench, bend the second pin in half. Simple.

The guide also functions as a very good beginner tutorial on lock-picking, covering the types of simple locks one is likely to encounter, and the various shortcomings of their construction that could impede efforts to open them. The whole site is a good resource for those who enjoy the art.

After that it is standard lock picking. Put torsion on the barrel and prod those pins into place with your reconfigured fashion accessories.