Watermelon Air Boat

watermelon-air-boat

We think you’ll turn a few heads in Central Park if you’re driving a water melon around when everyone else is piloting sailboats. This watermelon is both sea worthy and radio controlled thanks to the work which [Starting Electronics] put into it.

We used this image because it shows you what’s inside of the hull, but you don’t want to miss the thing motoring around an above-ground swimming pool in the clip after the break. The hollowed out shell is quite buoyant and has no problem staying afloat and upright with the addition of a propeller. The parts from a remote control airplane kit have been mounted on a wooden scaffold. This provides plenty of thrust with a servo motor moving turning the prop for directional control. There is no dagger board so the craft is a bit slow to respond to turns. But how responsive do you expect a floating melon to be?

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More Details About Laser Cut Gingerbread Houses

Members of Sector67 tried their hands at laser cut gingerbread houses. The Madison, Wisconsin based hackerspace is using the tabbed box method of assembly for the corners of the structure. They’ve also put up a bunch of information about laser settings and published the recipe used to mix up a sheet of gingerbread. This quite a bit more info than was provided with the project we saw a couple of weeks back.

The initial designs were made in Inkscape and then transferred to Corel Draw before heading to the cutter. They’ve got a 150W machine and found that a speed of 15 worked well when the speed was set to 100, with a corner speed of 60. The raw dough was rolled out to 1/8″ thickness. Possibly the best tip coming out of Sector67 is to lay 1/8″ dowels on either side of the dough. This way the rolling pin will stop when it hits the dowels resulting in the best possible uniform thickness. As reported in the previous project the odor generated while cutting is not the most pleasant. But we love the fusion of lasers with the age old process of building with cookies and decorating with candy.

Silent HTPC Build Is An Art Piece For The Livingroom

silent-htpc-build

This sexy beast is [DeFex’s] new silent home theater PC. To give you an idea of scale, that motherboard is a Mini ITX form factor. Mounted below it is the solid state drive which is an SLC version chosen because they tend to last longer than the MLC variety. This distinction comes with a price tag that is $100 more expensive.

But we digress. It’s the custom case that really caught our eye with this build. The frame is made of a huge aluminum heat sink. It measures about 7″ by 10″ and sets the final foot print for the computer. An aluminum puck was added to transmit heat from the processor to the heat sink. Holes were drilled and tapped into the heat sink to accept the brass stand offs which hold the motherboard in place.

The near side of the case is a sheet of acrylic. It connects to the rest of the case using 3D printed brackets at each corner. There is an additional bracket on the bottom to hold the hard drive in place. The sides of the case are filled in with bicycle spokes which also find a home in the corner brackets. Now the hard part will be figuring out which orientation looks the best for displaying his fine craftsmanship.

[via Reddit]

Repair Your Ice Maker Motor Without Buying A Whole New Assembly

ice-maker-repair

There are a number of things that can go wrong with an automatic ice maker. But one of the more common problems is that the motor which scoops the ice out of the integrated trays can burn out after years of use. [Dave] recently repaired a common ice maker motor and shows us how cheap and easy it can be. See how he did it in the video after the break.

Pictured above is the motor and gear box from the ice maker. Before disassembly he verified that the problem is with the motor by placing a piece of paper in the path of the fingers that move the newly formed ice. After removing the sensor arm and three screws he was able to pull this front portion from the unit. The two wires are clipped as near to the motor as possible and the motor itself comes out with just a twist. After verifying that the gears are not broken he sourced a $2.50 motor replacement by Googling the part number (M004 3W in this case). Once the new unit arrived the motor wires are connect in much the same way that a punch down Ethernet jack makes a connecting with insulated wires.

This is something worth looking into if your ice maker is not working. The manufacturer may suggest replacing the entire unit which can be well north of a hundred bucks… this is a worthwhile gambit to save some cash. Well, we guess you could always build your own non-electrical ice maker.

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Tea-bagging An Arduino

tea-bagging-arduino

[Dmitry Narkevich] likes a strong cup of tea and his method of getting there is to oscillate the tea bag as it steeps. But why take the time to do this when you can make an Arduino brew your tea for you. As you can see, he rigged up a system to move the tea bag as it steeps in his metal bottle.

The motion is provided by a hobby servo connected to an Arduino. This makes timing the process very simple and we’d imaging it’s only a matter of time before he adds an alarm so he’ll know when it’s ready. But the real hack comes in the apparatus that connects the servo to the bottle. Since he’ll be drinking out of it the assembly needs to be easy to remove and should be able to stand up to the abuse of being clamped on and taken off a few times each day.

The base of the device is a guitar capo. This is meant to gently clamp to the finger board of a guitar using spring tension so it is already covered in rubber which gives it a firm grip on the bottle’s opening. The servo is connected to a metal part from a stapler, and the string drapes over the body of a disposable pen. Don’t miss this in action in the clip after the break.

If you don’t have a servo on hand you could try using the sled from an optical drive.

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Leveraging The GPU To Accelerate The Linux Kernel

Powerful graphics cards are pretty affordable these days. Even though we rarely do high-end gaming on our daily machine we still have a GeForce 9800 GT. That goes to waste on a machine used mainly to publish posts and write code for microcontrollers. But perhaps we can put the GPU to good use when it comes compile time. The KGPU package enlists your graphics card to help the kernel do some heavy lifting.

This won’t work for just any GPU. The technique uses CUDA, which is a parallel computing package for NVIDIA hardware. But don’t let lack of hardware keep you from checking it out. [Weibin Sun] is one of the researchers behind the technique. He posted a whitepaper (PDF) on the topic over at his website.

Add this to the growing list of non-graphic applications for today graphics hardware.

UPDATE: Looks like we won’t be trying this out after all. Your GPU must support CUDA 2.0 or higher. We found ours on this list and it’s only capable of CUDA 1.0.

[Thanks John]

Self-balancing Unicycle Using Arduino And Sparkfun IMU

Raptor-Bike-self-balancing-unicycle

Here’s proof that you can build cool stuff with simple tools. This self-balancing unicycle uses an Arduino and a five degree of freedom IMU from Sparkfun to keep the rider upright. Well, it’ll keep you upright as long as you have good side-to-side balance. But that’s true of any unicycle, right?

The Raptor was built by [Nick Thatcker] who is no stranger to self-balancing transportation. A few years back he built a Segway clone and the same type of geared motor used in that project also went into this one. I connects to the wheel with a chain, allowing him to keep the motor hidden in the saddle. He gets between 90 and 120 minutes of used on one charge with a top speed of 10 MPH. The motor could move you along faster but he has limited this in firmware to ensure it has enough power to ‘catch up’ if you lean too far forward.

Don’t miss the demo after the break. If you like this unicycle there are several others worth looking at.

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