Printing Text With A Chart Recorder

July 20, 2014 by Eric Evenchick 6 Comments

Chart recorders are vintage devices that were used to plot analog values on paper. They’re similar to old seismometers which plot seismic waves from earthquakes. The device has a heated pen which moves across a piece of thermally sensitive paper. This paper is fed through the machine at a specified rate, which gives two dimensions of plotting.

[Marv] ended up getting a couple of discontinued chart recorders and figured out the interface. Five parallel signals control the feed rate of the paper, and an analog voltage controls the pen location. The next logical step was to hook up an Arduino to control the plotter.

However, once the device could plot analog values, [Marv] quickly looked for a new challenge. He wanted to write characters and bitmaps using the device, but this would require non-continuous lines. By adding a solenoid to lift the pen, he built a chart recorder printer.

After the break, check out a video of the chart recorder doing something it was never intended to do. If you happen to have one of these chart recorders, [Marv] included all of the code in his writeup to help you build your own.

Continue reading “Printing Text With A Chart Recorder” →

The CryptoCape For BeagleBone

July 20, 2014 by Brian Benchoff 14 Comments

[Josh Datko] was wandering around HOPE X showing off some of his wares and was kind enough to show off his CryptoCape to us. It’s an add on board for the BeagleBone that breaks out some common crypto hardware to an easily interfaced package.

On board the CryptoCape is an Atmel Trusted Platform Module, an elliptic curve chip, a SHA-256 authenticator, an encrypted EEPROM, a real time clock, and an ATMega328p for interfacing to other components and modules on the huge prototyping area on the cape.

[Josh] built the CryptoCape in cooperation with Sparkfun, so if you’re not encumbered with a bunch of export restrictions, you can pick one up there. Pic of the board below.

Continue reading “The CryptoCape For BeagleBone” →

The Radius T-T Velomobile

July 20, 2014 by Eric Evenchick 22 Comments

Over the past year, [Dave] has been hard at work on his human powered vehicle. One year and six hundred hours of build time later, the Radius T-T Velomobile is complete. This 80 lb. vehicle features a custom body, mirrors, and integrated lights.

The Radius T-T started out as a TerraTrike recumbent tricycle. [Dave] built the body by laying up fiber glass on a foam mold. To that he added a variety of 3D printed accessories such as lights and mirrors. Inside the cockpit, the driver can control turn signals and flashers.

[Dave]’s blog provides a massive amount of documentation on the build. Everything from 3D modelling of the vehicle in Blender to the rear view mirror design is discussed. This great looking build should move along quickly with its lightweight design, but we’re still waiting to hear how fast it goes. Either way, it should be a fun mode of transport which will definitely turn some heads.

Is Your Wearable Tech Too Subtle?

July 19, 2014 by Brian Benchoff 30 Comments

wrist

With any con, you’re going to have people walking around with things they’ve built. It’s the perfect venue for wearable tech, and the cream of the crop for HOPE X is [Zack]’s SmarTwatCh. Billed as a 3D printed big ass smart watch, it’s anything but subtle and has enough gadgets and gizmos to make even the biggest tech aficionado blush

The front of the SmarTwatCh is an authentic 2×20 glass encapsulated VFD running at 160 Volts, chosen for its danger and character. Inside the 3D printed enclosure is a Teensy 3.0, pots, knobs, and switches, a laser, LEDs, and an alcohol sensor because, “the future is quantified drinking”.

‘Apps’ for this smart watch include a TV-B-Gone, laser pointer, breathalyzer, flashlight, and just about anything else [Zack] can think of that would involve a Bluetooth adapter and a text display. Video of [Zack] demoing the watch at HOPE below.

Continue reading “Is Your Wearable Tech Too Subtle?” →

Long Range Wireless Sensors For The Home-Area-Network

July 19, 2014 by Matt Terndrup 16 Comments

7785441404784533190 In the near future, we will all reside in households that contain hundreds of little devices intertwingled together with an easily connectable and controllable network of sensors. For years, projects have been appearing all around the world, like this wireless sensor system that anyone can build.

[Eric] hopes his work will help bring the truly expansive Home-Area-Network (HAN) into fruition by letting developers build cheap, battery-powered, long-range wireless sensors. His method integrates with the pluggable OSGI architecture and home automation platform openHAB along with using an Arduino as the lower power, sensor node that is capable of utilizing many types of cheap sensors found online.

[Eric]’s tutorial depicts a few examples of the possibilities of these open-source platforms. For instance, he shows what he calls a ‘Mailbox Sentinel’ which is a battery-powered mail monitoring device that uses a Raspberry Pi to play the infamous, and ancient AOL sound bite “you’ve got mail.” It will also send an email once the postman cometh.

In addition, he lists other ideas such as a baby monitoring sentinel, a washer/dryer notification system, water leak detectors, and security implementations that blast a loud alarm if someone tries to break in. All of this potential for just around $20.

The key to making this project work, as [Eric] states, is the MQTT binding that ties together the Ardiuno and openHAB platform. This allows for simple messages to be sent over the Ethernet connection which is often found in IoT devices.

So all you developers out there go home and start thinking of what could be connected next! Because with this system, all you need is a couple of ten-spots and an internet plug, and you have yourself a strong foundation to build on top of. The rest is up to you.

This open, connected device is [Eric’s] entry for The Hackaday Prize. You can see his video demo after the break. We hope this inspires you to submit your own project to the contest!

Continue reading “Long Range Wireless Sensors For The Home-Area-Network” →

HOPE X: Interviews With Ellsberg And Snowden

July 19, 2014 by Rich Bremer 46 Comments

hopex_web_topbar_b

Two of the talks at HOPE X Saturday revolved around Daniel Ellsberg and Edward Snowden. Unless you’ve been living under a rock, you’ve heard of Snowden when he leaked thousands of classified NSA documents to several media outlets. The older readers may remember Ellsberg who released government documents, known as the Pentagon Papers, pertaining to government decisions made during the Vietnam War. It was a popular topic here as all three conference rooms were dedicated to the the talks and all three were completely filled to the point that staff again had to turn people away. Luckily, even if you couldn’t make it into a conference room you could still watch it as all talks are streamed live via the HOPE website.

Regardless whether you feel these two are heroes or traitors, the talks were interesting with both giving accounts of their story. Each interview was about an hour long.

Ellsberg, who was here in person, talked about his entire experience and why he felt it necessary to reveal the classified documents he had secretly made copies of. Even though Ellsberg did release what he felt was evidence that the government knew that the war could most likely not be won and would cause many more casualties, he does still feel that some things are necessary for the government to keep secret. He gave an estimate that 95% of the documents classified are over-classified at the time of document creation and after a few years only 0.5% of the those documents are still classified correctly, the remaining 99.5% still over-classified.

Snowden, who was available by video, was warmly welcomed and applauded by the attendees of the conference. During the talk he discussed that he did not feel that some of the NSA’s actions he was aware of were constitutional, specifically collecting enormous amounts of data of not only ‘people of interest’, but of everyday american citizens. Snowden feels that we, as a community, give too much trust in our electronic devices. He went on to suggest that the population do what it can to minimize the capability of organizations to monitor communications and track data. He urged that people, with the capability, help educate others on how to interact with technology safely, reliably and in a way that serves the interest of all people, not just a select few.

Let us know what you think below in the comments.

snowden interview

A Laser Cut Word Clock

July 19, 2014 by Nick Conn 18 Comments

What is a word clock? A word clock is a clock that displays the time typographically that is also an interactive piece of art. Rather than buy one for $1500, [Buckeyeguy89] decided to build one as a present for his older brother. A very nice present indeed!

There are many different things that come into play when designing a word clock. The front panel is made from a laser cut piece of birch using the service from Ponoko. Additionally, white translucent pieces of acrylic were needed to keep each word’s light from bleeding into the neighboring letters. The hardware uses two Arduinos to control the LEDs and a DS3231 RTC for keeping accurate time. The results are very impressive, but it would sure make assembly easier if a custom PCB was used in the final version. For a one-off project, this makes a great birthday present.

The craftsmanship of this word clock is great, making it well suited for any home. What projects have you built that involve more than just electronics? Sometimes, quality aesthetics make all the difference.