In 1966, [Gene Roddenberry] introduced fully manual doors powered by a stagehand on Star Trek. The fwoosh sound of the door was later dubbed into each show, but progress marches on, and now [Alex] created his own Star Trek-style automatic doors for his house.

The build includes a ‘control panel’, and [Alex]‘s door operates in three modes: Open, and stay open; Close, and stay closed; and Automatic. The control panel itself is fairly remarkable. A small puck interacts with a magnetometer underneath [Alex]‘s counter. If the puck is pointed towards ‘Open’, the door stays open. If the door is pointed towards ‘Closed’, the door stays closed. If the puck isn’t near the magnetometer, the door operates in automatic mode with the help of a few IR sensors to detect someone trying to get in or out of [Alex]‘s kitchen.

For the mechanical portion of the build, [Alex] used a One meter long piston with the quietest air compressor he could find. We can’t tell from the video after the break if the compressor ever kicks in, but [Alex] says it’s about the same volume as his fridge. As a small added bonus, the new automatic door does have a fwoosh sound, just like [Gene] would have wanted.

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[Shawn] was looking for a way to shake up his decorations this Halloween and decided to build a new prop for his front yard. He had a pair of old oil barrels in his garage and thought they would look great with a little bit of work.

He bolted the pair of barrels together, then slapped a fresh coat of black paint on them before adding a bright yellow radiation trefoil to each one. One barrel contains a pneumatic piston that opens the lid, revealing a light up pumpkin, a fog machine, and a set of water nozzles that spray the area. The second drum houses an air compressor, a wireless router, and an IP camera for recording the action. A web-enabled Arduino triggers the lid and sprayer, both of which can be controlled from the comfort of his house.

We think it’s a creative use of some old scrap barrels, but we’re hoping he doesn’t plan on wetting trick-or-treaters that pass through, as it seems  like a good way to get your house egged or otherwise vandalized on Halloween. If the water sprayer were perhaps swapped out with some other cool effects, [Shawn] is far less likely to be the target of some angry, wet teenagers.

Be sure to check out the video below to see the display in action.

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Feeling pretty good after putting together your brand new standing computer desk? Step aside please, [Kagen Schaefer] has something he’d like to show you.

His Pipe Organ Desk is undoubtedly one of the coolest pieces of furniture we have seen in a long time. The project took [Kagen] over three years to complete, which sounds about right once you see how much attention was put into every last detail.

This desk is amazing in several ways. First off, the entire desk was constructed solely from wood. The drawers, the supports, knobs, screws, and even the air valves – all wood. Secondly, when one of the desk’s drawers are pushed in, air is directed to the organ pipes at the front of the desk, which plays a note.

A small portion of the air is also directed into the desk’s pneumatic logic board, which keeps track of each note that has been played. When someone manages to play the correct tune, a secret compartment is unlocked. The pneumatic logic board is an unbelievable creation, consisting of well over 100 wooden screws which can be tuned to recognize any number of “secret tunes”.

Sure a well-placed axe can open the compartment too, but who would destroy such a fine piece of work?

[via Make]

The human body is an amazing instrument from an engineering standpoint. Replicating just one part of it proves extremely difficult but these athletic legs show a lot of promise. This is the work of a Japanese researcher named [Ryuma Niiyama]. He’s been working on the design for years, and is now using pneumatic actuators to mimic the muscles in a human leg. The lower portion of the leg uses a spring mechanism that resembles some running prosthetics currently in use. These serve as a spring to store energy and reuse it by bouncing against the ground. He’s trying to teach his robot to use these legs; taking it through a learning process necessary to use the thigh actuators for locomotion and balance. We were surprised at how life-like the motion in the video after the break is. Even when falling down the movements are very life-like.  We thought the movements of Little Dog were real enough to be creepy, and this robot may be close enough to our own mannerisms to fall into the uncanny valley.

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Do you have enough confidence in your hacking abilities to build a project into the walls of your home? [Marc] used his skills to build an air-powered sliding door for his bedroom. It is similar to the sliding door you’d find on the Enterprise, two sections that slide nicely into the wall to let you pass. Although the picture above shows the internals, he followed through and ended up with a fully finished room that looks fantastic. A compressor in the attic provides the pressure necessary to move the door sections. It is automated, but uses a button press or keypad combination to run instead of detecting motion. Of course, since he’s using a PIC microcontroller to drive the system there’s always room for future changes. Check out how great the finished look is in the video after the break.

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This rifle-shaped water cannon looks great and packs a big punch. We guess you could say that it’s a water balloon launcher, but the balloons are torn off and drop like the wad from a shotgun shell when fired. So we think this launches water blobs, or orbs, or something along those lines.

[Wolf] built it using PVC and some brass fittings that allow for the injection of compressed air. There’s a slick valve system that he developed which we don’t get a great look at in the build pictures. Fortunately, there’s an animated GIF that shows the various stages. Using his valve there’s no need for any electrical system like a lot of other pneumatic launcher systems use.

Just like the water-filled ping-pong gun, you’ve got to be careful with this thing. As you can see in the clip after the break there’s lethal force behind these projectiles. Especially when [Wolf] swaps out the water balloons for big steel darts.

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[Scott] built a confetti canon to spice up the party. It’s pneumatic and re-purposes a fire extinguisher as the air tank. He had a refillable extinguisher that used water instead of chemical retardant. After emptying the water and ensuring all of the pressure had been release he swapped the hose and nozzle for a sprinkler solenoid valve. Securing the extinguisher’s actuator lever with a pipe clamp holds the internal valve open, leaving the solenoid to control the pressure release. This way the canon can be fired electronically, or manually.

This type of solenoid valve is a popular choice with pneumatic canons. We suppose you could even adapt this for use as a T-shirt cannon.

[Thanks BoBeR182]

[Daniel Eindhoven] put together this 11,344 Joule capacitor bank that he says would be perfect for weapons such as a rail gun, coil gun, or electrothermal-chemical gun. He machined a couple of aluminum plates to act as a positive and negative bus. The two are separated by a denuded sheet of PCB (making us wonder how he got the copper to peel off like that). Once charged there’s the little problem of how to discharge the system without getting bit, which [Daniel] solved by building a pneumatic switch. We didn’t find the test-fire footage very interesting but we did embed the demonstration of his switch after the break.

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