RPiTX Turns Rasberry Pi into Versatile Radio Transmitter

Since the discovery that some USB TV tuner dongles could be used to monitor radio waves across a huge amount of spectrum, the software-defined radio world has exploded with interest. The one limiting factor, though, has been that the dongles can only receive signals; they can’t transmit them. [Evariste Okcestbon, F5OEO] (if that is his real name! Ok c’est bon = Ok this is good) has written some software that will get you transmitting using SDR with only a Raspberry Pi and a wire.

There have been projects in the past that use a Pi to broadcast radio (PiFM), but this new software (RPiTX) takes it a couple steps further. Using just an appropriately-sized wire connected to one of the GPIO pins, the Raspberry Pi is capable of broadcasting using FM, AM, SSB, SSTV, or FSQ signals. This greatly increases the potential of this simple computer-turned-transmitter and anyone should be able to get a lot of use out of it. In the video demo below the break, [Evariste] records a wireless doorbell signal and then re-transmits it using just the Rasbperry Pi.

The RPiTX code is available on GitHub if you want to try it out. And it should go without saying that you will most likely need an amateur radio license of some sort to use most of these features, depending on your locale. If you don’t have a ham radio license yet, you don’t need one to listen if you want to get started in the world of SDR. But a ham license isn’t hard to get and at this point it shouldn’t take much convincing for you to get transmitting.

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Dealing with Fallout

In just a few short days, Fallout 4 will be released and a substantial portion of the Hackaday staff will be taking the day off. As you would expect, a lot of people with 3D printers, soldering irons, and far too much time on their hands are getting pumped for the Fallout release. Here’s a few Fallout builds we’ve found over the past few weeks:


919501417186321280The most iconic thing you’ll find in a Fallout game is the Pip-Boy, the UI for the player and a neat wrist-mounted computer (that somehow has a CRT in it, I guess) for the player’s character. Hackaday’s own [Will Sweatman] built his own Pip-Boy 3000 that’s completely functional. The build uses a 4.3 inch touch display, a 10 position rotary switch, and a bunch of 3D printed parts.

Elsewhere on Hackaday.io, [Karl] is working on a functional Pip-Boy controller for Fallout, and [cody] built one with a Raspberry Pi. Of course, if you’re super special and have two thousand dollars to blow, Bethesda released a limited-edition Pip-Boy edition of Fallout 4 that’s compatible with most cell phones.

The Not Pip-Boys


There’s more to Fallout than just wrist-mounted computers, and for the true aficionados, there are gigantic gear-shaped doors. [TreyHill] has a partially finished basement with a gaming room tucked behind his very own vault door. The door itself is built out of plywood and rolls along a gear rack mounted to the floor. Will it hold up to a nuclear blast? Probably not. Is it up to code? It looks cool, at least.

[Lilykill] on Thingiverse is extremely capable with a copy of solidworks and produced a bunch of 3D models from the Fallout universe that includes power armorray guns, more Pip-Boys, plasma grenades, and a Nuka-Cola truck.

Fallout 4 for the Apple II

Fallout 4 will be available for the PS4, Xbox One, and PC, leaving out a large contingent of retro gamers. Fear not, lovers of the 6502: there’s’ a version for the Apple II:

This tribute to both the Apple II and Fallout was made with the Outlaw Editor, an SDK for pseudo-3D game development on exceedingly old hardware. There’s actual ray casting happening in this tribute, and it works just the same as Wolfenstein 3D or the like.

One Dollar USB Sound Card Turned O-Scope

Using the inputs on a computer’s sound card is an old trick to fake a very simplistic, AC coupled, slow oscilloscope. You can get DC operation by desoldering a couple capacitors, but if the sound card is integrated into the motherboard it raises the stakes if you mess that up.

[TMSZ] has a better option, a ~1 dollar USB sound card which is easily hacked to work as a simple oscilloscope. Easily found on eBay, the 7.1 virtual channel sound card is identical in brains to a more expensive c-media model, but the layout of the PCB makes it easier to bypass the DC blocking caps. Software and DLL files to use the sound card with Miniscope v4 — a Windows GUI for oscilloscopes — are also linked, so getting set up should be fairly simple.

Now of course this is not lab-grade measurement equipment: the sampling rate is limited to 44KHz and the voltages must be in the typical “line level” range, under two volts. If you don’t mind a little extra noise, you can increase the input impedance with a single resistor. This extends the input range up to six volts, which covers most hobby and microcontroller usage.

So if you’re really in need of a scope, but only have a buck to spend, this may be just the hack for you! Those willing to shell out a hefty sum for a high-end headless oscilloscope should look onto the virtual bench.

Shoot Down Drones with Pumpkin Cannons

Are you worried about the inevitable drone invasion? Have you been waiting for a defense system that you can trust? Look no further. This video shows just how effective the system is — no smoke and mirrors. Just results.

Forget RF jamming or WiFi hacking. If those devices work at all, they’re probably only good for stopping consumer devices. If you want to be sure that a drone is taken down, you’ll need a pumpkin cannon.

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Blacksmith Forge Made From the Bathroom Sink

The sweltering heat had finally moved on and Giant Tick season was coming to a close (not kidding, they are HUGE here), when I decided to fire up my hacked together blacksmith forge made out of an old bathroom sink and aquarium stand.

In the age-old formula I needed to supply an air source to a fuel to create enough heat to make iron malleable. I got the idea that this particular bathroom sink might be a good candidate for a fire bowl after I banged my shin with it and then cursed at it. It was clearly made of cast iron and as proof it was clearly unfazed by my tirade of words which I hope my son has learned from the Internet and not from listening to me remodel the bathroom.

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SEC Allows Crowdfunding

Kickstarter is not an investment, and no matter how many times this is repeated, you’ll find the phrase ‘my investment’ in the comments section of nearly every failed Kickstarter, Indiegogo, or other crowdfunding campaign. These campaigns are more closely related to group buys, and you’ll never find a Kickstarter offering equity or any sort of return beyond the latest electronic bauble, indie game, or graphic novel. Sure, you may bootstrap a business with that pledge, but don’t expect dividends from Ouya or Pebble.

Now, this may finally change. The US Securities and Exchange Commission approved new rules for crowdfunding, allowing startups to raise money from Jane and Joe Internet.

Previously, angel investments, venture capital, and hedge funds were not for the common man; these were high-risk investments, and only accredited investors could participate in these funding rounds. Accredited investors, at least in the US, are individuals with a net worth of at least $1 Million, or an income greater than $200,000 in each of the previous two years. The reason for only allowing accredited investors – depending on your interpretation – is to protect consumers or to maintain a perverse oligarchy by installing a glass ceiling over the middle class. Either way, normal people couldn’t invest in high-risk investments until now.

Congress has seen fit to create a new class of investor, and pursuant to Title III of the JOBS Act, the SEC recently released the complete rules for crowdfunded investment. In a massive, 600-page tome, all the regulations are laid bare, ready for the next serial entrepreneur who seeks at most $1 Million in investment for their next startup.

Investors and Startups

The rules issued by the SEC immediately place some limitations on what can be done under the new regulations. For startups, a maximum of $1 Million can be raised over a 12-month period.

For investors with an annual income or a net worth of less than $100,000, a maximum of $2,000 or 5% of annual income can be invested, whichever is greater. For investors with an annual income or net worth greater than $100,000, 10% of their income or net worth can be invested, whichever is smaller.

Brokers and Funding Portals

Investors and entrepreneurs are not allowed to keep their transactions to themselves; this is the SEC after all. Transactions will go through registered broker-dealers or something called a ‘funding portal’. These funding portals are forbidden from offering advice, making recommendations, advertising, paying employees a commission, holding securities themselves, and the regulation bars directors, officers, and partners of the funding portal from holding investments using that funding portal’s services.

It’s The Complete Opposite of Kickstarter

Kickstarter was never known for its transparency. While the basic premise of crowdfunding the manufacturing of a few baubles or 3D printers is sound – it’s cheaper per unit to build a hundred of something than to build just one – the reality of actually building something meant Kickstarters failed – it’s exponentially harder to build ten thousand of something than it is to build a hundred. Add to this Kickstarter’s investments in campaigns featured on their website, and you have the recipe for practices that aren’t illegal but certainly don’t pass the sniff test.

The regulations put forth by the SEC turn the most common trope of the Internet economy on their head; companies responsible for bringing startups and investors together are not financially dependant on these startups. Companies can not raise more money than they could handle, and hopefully individual investors won’t take to crowdfunded companies like online poker and day trading.

Traditional crowdfunding has started a lot of great companies so far; the Form1 printer began as a crowdfunding campaign, and Reading Rainbow still lives thanks to a successful Kickstarter. With these new regulations come new possibilities for the latest startups, and more paths to success than a traditional angel investor or VC tycoon.

Tote Boards: the Impressive Engineering of Horse Gambling

Horse racing has been around since the time of the ancient Greeks. Often called the sport of kings, it was an early platform for making friendly wagers. Over time, private bets among friends gave way to bookmaking, and the odds of winning skewed in favor of a new concept called the “house”.

During the late 1860s, an entrepreneur in Paris named Joseph Oller invented a new form of betting he called pari-mutuel. In this method, bettors wager among themselves instead of against the house. Bets are pooled together and the winnings divided among the bettors. Pari-mutuel betting creates more organic odds than ones given by a profit-driven bookmaker.

Oller’s method caught on quite well. It brought fairness and transparency to betting, which made it even more attractive. It takes a lot of quick calculations to show real-time bet totals and changing odds, and human adding machines presented a bottleneck. In the early 1900s, a man named George Julius would change pari-mutuel technology forever by making an automatic vote-counting machine in his garage.

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