Reverse Engineering a Different Kind of Bus

Radio enthusiasts have a long history of eavesdropping on non-broadcast stations–police, fire, and public transportation frequencies, for example. These days, though, a lot of interesting communications are digital. When [bastibl] wanted to read data displayed on bus stop signs, he turned to software defined radio. He used gr-fosphor to monitor the radio spectrum as buses drove by and discovered a strong signal near 151 MHz (see photo below).

That, however, was just the start. Using a variety of tools, he figured out the modulation scheme, how the data framing worked, and even the error correction scheme. Armed with all the information, he built a GNU Radio receiver to pick up the data. A little number crunching and programming and [bastibl] was able to recover data about  individual buses including their position and schedule.

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Okay, Google. Start the Jeep!

When [wizardpc] bought his Jeep, it came with an Avital 3100L car alarm system; but after it started going on the fritz, he needed to replace it. So he opted for a new alarm system with the same harness type — and then he decided to hack it.

When installing the new alarm system, an Avital 5103L combo unit, he realized there was an extra wire that when grounded, starts the vehicle — Avital had included the hardware upgrade before the software came out on this specific model. Score.

From there it was a pretty easy hack. All he needed was a Raspberry Pi 2, a relay board, and a few dirt simple lines of code. On the mobile end of things is a collection of hacks; he’s using Tasker with his Android phone to add a special command to Google Now. He tells Google to ‘Start the Jeep’ and after a few seconds, she turns right on.

Wouldn’t it be nice if Google would expose some hooks so that we can all add our own functionality to Google Now without doing the app-juggling  [wizardpc] used for this? If you have your own set of Google Now hacks we’d love to hear about it. Send us a tip!

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The EM Drive Might Not Work, but We Get Helicarriers If It Does

There is a device under test out there that promises to take humans to another star in a single lifetime. It means vacations on the moon, retiring at Saturn, and hovercars. If it turns out to be real, it’s the greatest invention of the 21st century. If not, it will be relegated to the history of terrible science right underneath the cold fusion fiasco. It is the EM drive, the electromagnetic drive, a reactionless thruster that operates only on RF energy. It supposedly violates the laws of conservation of momentum, but multiple independent lab tests have shown that it produces thrust. What’s the real story? That’s a little more complicated.

The EM Drive is a device that turns RF energy — radio waves — directly into thrust. This has obvious applications for spacecraft, enabling vacations on Mars, manned explorations of Saturn, and serious consideration of human colonization of other solar systems. The EM drive, if proven successful, would be one of the greatest inventions of all time. Despite the amazing amount of innovation the EM drive would enable, it’s actually a fairly simple device, and something that can be built out of a few copper sheets.

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Hackaday Prize Entry: Project Dekoboko 凸凹 Maps Bumpy Roads On A Bike

If you live in New England (like me) you know that the roads take a pounding in the winter. Combine this with haphazard maintenance and you get a recipe for biking disaster: bumpy, potholed roads that can send you flying over the handlebars. Project Dekoboko 凸凹 aims to help a little with this, by helping you map and avoid the bumpiest roads and could be a godsend in this area.

The 2015 Hackaday Prize entry from [Benjamin Shih], [Daniel Rojas], and [Maxim Lapis] is a device that clips onto your bike and maps how bumpy the ride is as you pedal around. It does this by measuring the vibration of the bike frame with an accelerometer. Combine this with a GPS log and you get a map of the quality of the roads that helps you plan a smooth ride, or which could help the city figure out which roads need fixing the most.

bike-measures-bumpy-roads-thumbThe project is currently on its  third version, built around an Arduino, Adafruit Ultimate GPS Logger shield, and a protoboard that holds the accelerometer (an Analog ADXL345). The team has also set up a first version of their web site, which contains live data from a few trips around Berlin. This does show one of the issues they will need to figure out, though: the GPS data has them widely veering off the road, which means that the data was slightly off, or they were cycling through buildings on the Prinzenstrasse, including a house music club. I’ll assume that it was the GPS being inaccurate and not them stopping for a rave, but they will need to figure out ways to tie this data down to a specific street before they can start really analyzing it. Google Maps does offer a way to do this, but it is not always accurate, especially on city streets. Still, the project has made good progress and could be useful for those who are looking for a smooth ride around town.

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Dutch Student Team Aims To Launch Rocket to 50KM

Space. The final frontier. These are the voyages of DARE, the [Delft Aerospace Rocket Engineering] team, who are looking to launch a rocket to 50 kilometers (about 31 miles) to break the European amateur rocketry record later this year.

This brave crew of students from the Delft Technical University is boldly going where no European amateur has gone before with a rocket of their own design called Stratos II, a single stage hybrid rocket which is driven by a DHX-200 Aurora engine. This self-built engine uses a combination of solid Sorbitol and candlewax fuel, with liquid Nitrous Oxide as the oxidizer. The rather unlikely sounding combination should produce an impressive 12,000 Newtons of maximum thrust, and a total of 180,000 Ns of impulse. It’s difficult to make a proper comparison, but the largest model rocket motor sold in the US without a special license (a class G) has up to 160 Ns of impulse and the largest engine ever built by amateurs had 411,145 Ns of impulse.

The team did try a launch last year, but the launch failed due to a frozen fuel valve. Like any good engineering team, they haven’t let failure get them down, and have been busy redesigning their rocket for another launch attempt in the middle of October, Their launch window begins on October 13th at a military base in southern Spain, and we will be watching their attempt closely. Godspeed, DARE!

In commercial space news, yesterday NASA tested the RS-25 engine that will be used in the Space Launch System — the rocket it’s developing to take astronauts to the moon and mars. Also, the NTSB report on the tragic crash of SpaceShipTwo was released a few weeks ago. The report found that the feather mechanism was unlocked by the copilot at the wrong time, leading to the crash. Future system improvements will be put in place to ensure this doesn’t happen again.

Update – The Stratos II is a single-stage rocket, not a two-stage, as an earlier version of this article described. 8/16/15

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Segway Build You Can Do Yourself

We’ve seen lots of Segway variants on Hackaday, but they don’t always have detailed instructions on how they made it… Well lucky for us, [Bob] from [Making Stuff] just finished his extensive Segway project with tons of videos of the build!

Inspired by other self-balancing scooter projects he had seen online, [Bob] wanted to try his hand at building one. So he took bits and pieces from designs he liked, and came up with his own solid looking Segway clone design. Using Google Sketchup he drew up the frame, and from there it was all hands on deck. A bit of TIG welding later and it was time for the components.

Some small slight mechanical hiccups aside, the longest part of the project was the electronics and software — getting it to work like a real Segway. After writing his own code he ran into a few roadblocks, but luckily he was able to get some help from someone at his local Maker meetup which saved a lot of troubleshooting on his end.

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The French Built the Superconducting Hoverboard 4 Years Before Lexus

The internet only just got over Lexus’ real working hover board, but as it turns out, a team of researchers from the University of Paris Diderot already built one, over 4 years ago (machine translation)!

Using the same principles as the hover board Lexus build, the researchers built a very expensive neodymium magnet track to test the board on. Only difference here is that they didn’t hide the magnets. The hover board itself was machined out of wood, and houses a large sealed metal tray which contains the superconducting bricks.

Pour in some liquid nitrogen through the funnel, and you’re ready to witness some of the quantum properties of superconductors! The board floats a few centimeters above the magnetic rails, and in their tests was able to lift people over 100 kg in weight (hint for most Americans… there are 2.2 pounds to one kilogram).

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