DIY Pneumatic Skeleton And Air Horn Gag To Scare Those Trick-Or-Treaters

October 19, 2013 by Todd Harrison 13 Comments

[Rick Osgood] has been busy making more scaring gags for Halloween. This week he’s sharing great ideas for an air horn and pneumatic jumping skeleton, both actuated by 24 V sprinkler valves. These two new gags can easily be activated using [Rick’s] cardboard floor plate switch and three 9 V batteries cleverly snapped together in series for a 27 V supply (we can’t resist dropping in this link to a 2196 V supply from 9 V batteries just for fun).

The air horn construction is quite unique using a latex balloon strategically located as a reed valve for the air to vibrate over as it rushes out making a very loud honking sound. [Rick] then connected his manual bicycle pump to an air supply so that when an air valve is actuated the bicycle pump handle with a skeleton wired to it pops up. It then lowers back down via a bleed hole in the air line. Both the air horn and pneumatic pop-up skeleton seem simple to construct and his tests show them functioning perfectly.

Being the air storage chambers are small the re-trigger setup seems too repetitive to be practical for a continuous stream of Trick-Or-Treaters. Perhaps one could hide an air compressor with a long feed line to supply the gags? Plus, using an air compressor would come in handy for other scary blasts of air. Of course you would want to lower the compressor’s output regulator to safe levels so you don’t risk blowing apart your pop-up skeleton rig or any pipes.

Follow along after the break to see how to build these two great gags and get some tips from Mr. Safety.

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BlenderDefender: Automating Pavlovian Conditioning

October 14, 2013 by Marsh 29 Comments

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This isn’t your typical home automation project; who turns a blender on remotely? [Brian Gaut] did, when he rigged his blender and a strobe light to scare his cat off the kitchen counter. To be fair, we’ve linked to this project before on Hackaday—twice actually—but neither the article about relays or the related cat waterwall article actually talk about the BlenderDefender, and that’s a shame, because it’s pretty clever.

[Brian] began by installing a DCS-900 network camera on the wall near his kitchen sink. The camera monitors any motion on the counter, and once it detects something, a networked computer starts recording individual frames. This security camera setup isn’t looking for criminals: [Brian] needed to keep his cat away from a particularly tasty plant. The motion detection signals an X10 Firecracker module to turn on both a nearby blender and a strobe light, provoking some hilarious reactions from the cat, all of which are captured by the camera.

Check out some other ways to work with the X10 firecracker, and feel free to jump into the home automation discussion from last week.

[Thanks Joy]

Hack A Solar Garden Light Into A Flashlight

October 12, 2013 by Marsh 4 Comments

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While browsing through his local dollar store, [Taylor] came across a suspicious looking rock that, upon closer inspection, turned out to be a solar garden light. He scooped it up, took it home and cracked it open, modding it to function as a handheld solar flashlight.

Inside was a pathetically small 40mAh rechargeable battery, which he upgraded to a more standard rechargeable AA. The garden rock came pre-built with its own boost converter to kick up the voltage for the LED, but it was fairly dim. We’re guessing [Taylor] didn’t bother reverse engineering the converter and instead simply did some trial and error, but he managed to increase the LED’s brightness by slapping on a different value inductor.

As fun as it may be to have a rock for a flashlight, [Taylor] decided to cobble together a custom case out of a spare USB charger, making a battery holder and adding a pushbutton. The result is a handy solar flashlight that takes around five hours to charge. Check out some other custom lights: a lithium-powered PVC flashlight or one with a snazzier aluminum body and interchangeable heads.

Cuba: A DIY Society?

October 10, 2013 by James Hobson 55 Comments

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After the U.S. left Cuba back in the 60’s, most of the engineers went with them, so [Fidel Castro] told the citizens to learn how to make stuff themselves. They were called the National Association of Innovators and Rationalizers (ANIR), and that’s exactly what they did. This was the beginning of Cuba’s backyard innovation.

Fastforward a few decades and the 90’s were a very difficult time for Cuba. With the collapse of the Soviet Union in 1991, a severe economic downturn almost crippled the country, and as a result a Cuban DIY culture began to flourish even more — out of absolute necessity. No money, no imports, only what they already had. Making and fixing things became a part of life, you couldn’t just go out and buy a solution to your problem, you had to do it yourself. This might be one of the greatest examples of what a full-flung maker/DIY society would be like — well, maybe minus the communist part.

The excellent video after the break is a short story about the designer [Ernesto Oroza], who started collecting examples of this DIY culture under his art project aptly called, Technological Disobedience. It’s worth the watch, so take a look.

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DIY CD Autoloader

October 5, 2013 by James Hobson 9 Comments

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From the German Hackerspace Ffm comes this extremely robust DIY disc autoloader (translated)! We hope your German isn’t too rusty…

[David] was tired of copying his CD collection by hand, so he set out to make an open source DIY disc autoloader. His first prototype was this one, which we have to admit gets style points (it made use of a gaming PC tower as the enclosure).

One of his goals for the project was simplicity, and with that in mind he created a driverless solution, using mechanical actuators to do everything — all you have to do is plug in your computer to the drive. It makes use of a gripper taken from a notebook optical drive and a series of counterweights to pick up and deposit the disks. The frame is made of aluminum extrusion and the major functional brackets are all 3D printed.

To see it in action, stick around after the break. We personally like the use of the counterweight pulley in the back!

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JJ Dasher: The Tinkerer (Documentary)

October 5, 2013 by James Hobson 12 Comments

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This isn’t our usual faire, it’s a really cool documentary on a hacker. [JJ Dasher] is a tinkerer from Taylorsville, Utah — and this is his story.

Like many mechanical hackers, he got his start taking apart engines with his dad who owned a motorcycle repair shop at the time. The cover photo above is of his micro-bike project, which can get him going quite fast! He’s also built quite a few tesla coils, and loves picking up things from thrift stores to hack. He’s got a kid now which takes up a lot of his time, but he jokes that his son is just his next big project waiting to be finished.

We’ve actually featured [JJ’s] projects quite a few times before. He brought us the Doombox (handheld Doom-only computer), the awesome brute force GPS PIN cracker, and in the spirit of halloween one of our favorites: a tesla coil that delivers shocking candy!

Stick around after the break to watch the well-filmed documentary — don’t worry, it’s only 8 minutes long!

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Electrooculograph (EOG) From A Video Stream

October 4, 2013 by James Hobson 9 Comments

[Michael] from Lucidcode is at it again, this time with an Android app called Halovision.

In case you don’t remember, this is the guy who has been working on the Lucid Scribe Project, with the end goal of communicating from inside your dreams! Here’s the basic gist of it. If we can use a sensor to detect REM (rapid eye movement) or body movement during sleep, we can tell if we’re dreaming — then it’s just a matter of using an audible cue to inform the sleeper of the dream, so they can take control and become lucid.

The first way they did this was by using commercial EEG headsets to detect REM. We covered a hack on modifying one so it would be more comfortable to wear at night, but what is really exciting is [Michael’s] new app, Halovision — No EEG required

It’s an Android app that uses the camera to detect movement during sleep, and it is only the first plugin planned for Lucid Scribe. The algorithm is still in its experimental stages, but it is at least somewhat functional at this time. They note it’ll only work for day-time naps or with a bright night light, but this could be easily solved with an IR webcam and a few IR LEDs.

It will be interesting to see where this all goes, has anyone else been following or participating in Lucid Scribe?