Candle Powered Fan Keeps You Cool Using a Thermoelectric Generator

Candle powered fan

This is a great example of using a thermoelectric generator for a project. [Joohansson] made both a functional, and aesthetically beautiful fan using components from a computer.

Thermoelectric generators (TEGs for high temperatures, and cheaper TECs for lower temperatures) are also called peltier elements, which look like small square pieces of ceramic with two wires sticking out of them. If you supply power to it, one side will become hot, and the other cold. The TECs [Joohansson] is using want a temperature difference of 68C between either sides. They are typically used for cooling electronics and even some of those cheap mini-fridges will make use of one with a giant heat sink on the hot side.

In addition, they can be used as an electric generator, thanks to the seebeck effect. If you can create a temperature differential between the two sides, you can generate electricity. Using a CPU heatsink, cooler, and fan, [Joohansson] was able to power a small DC fan using only a candle. It’s a brilliant demonstration of the seebeck effect.

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Cheap Under-Cabinet Lights Reimagined as Photography Lighting

diy photography lights

Professional photography lighting can be expensive. Sometimes the professional photographer may not want (or need) to spend the big bucks on lighting. [Alex] is one of those folks. He needed a specialized light source and instead of going out and buying some, he made exactly what he needed out of components unlikely to be found in a photography studio.

The project started off with some off the shelf $12 Home Depot under-cabinet lights. Foam core board was attached to the sides of each light to adjust the beam’s width. Opening and closing these foam flaps allow the light beam to be adjusted to ensure the perfect shot.  The entire assembly was then taped to long, thin pieces of wood. The wood’s sole purpose is to facilitate mounting of the light.

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Designing a Front Panel for a DIY Project

DIY Front Panel

 

When building a one-off DIY project, appearances tend to be the least of our priorities. We just want to get the device working, and crammed into some project case. For those that like to build nicer looking prototypes [JumperOne] came up with a slick method of building a custom front panel for your DIY project.

The first step is to get the dimensions correct. You CAD tool will generate these from your design. [JumperOne] took these measurements into Inkscape, an open source vector graphics tool. Once it’s in Inkscape, the panel can be designed around the controls. This gets printed out and aligned on a plastic enclosure, which allows the holes to be marked and drilled.

With the electronics in place, the front panel gets printed again on a general purpose adhesive sheet. Next up is a piece of cold laminating film, which protects the label. Finally, holes are cut for the controls. Note that the display and LEDs are left covered, which allows the film to diffuse the light. The final result looks good, and can provide all the needed instructions directly on the panel.

[Thanks to Ryan for the tip]

Some Tips About Tips

hackadayTipsaboutTips02

Gather, boys and girls, while we take a moment to talk about submitting projects via the Hackaday Tips Line. Come across something really cool that you think deserves a mention on our page? Let us know about it! Did you yourself make something really cool? Tell us about that, too! It doesn’t matter if it’s a project that’s been sitting on some dark corner of the Internet for a few years. If we haven’t seen it yet, we want to.

Don’t think your project is good enough for Hackaday? You’re probably too self-critical. We’re after hacks: it’s the idea that counts. Not polished? No problem. The only thing that needs to be complete is your description of the hack.

Stick with us after the jump; we’ve got plenty of tips about tips to help you out.

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LEGO® My Single-Phase Induction Motor

[Diato556] made a really cool single-phase induction motor with parts mounted on Duplo blocks. He has posted an Instructable where he uses these modular parts to  demonstrate the motor and the principles of induction as described after the jump.

 

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Shapeoko 2 Mods: Dust Mitigation and Limit Switches

so2-main

 

Not long ago the Shapeoko 2 came out. In case you missed it, the Shapeoko 2 is the 2nd generation bench-top CNC Router of the namesake. All axes roll on Makerslide and v-wheels. The X and Y axes are belt driven, power is transmitted to the Z axis by lead screw.

As with most products, there will be people who must hack, mod or upgrade their as-received item.  If you are a regular Hackaday reader, you are probably one of those people. And as one of those people, you would expect there have been a few individuals that have not left this machine alone.

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3 Cheap Hood/Hatchback/Topper Mods to Save Your Noggin

Gas Lift Fixes by Briansmobile1

This is a mod more than a hack but any time you can alter original equipment to maintain its usability is a win-win scenario for you and the environment. Everyone has or knows somebody that has a vehicle and most vehicles nowadays have some type of hatchback or hood where the support solution is gas filled struts. Inevitably these gas filled struts fail with age and the failure is accelerated in hotter or colder climates. If you ever had to replace these items you know they can cost a minimum of $20 to as much as $60 a piece. Most vehicles require two, four or even eight of these costly little devices.

[Brian] from Briansmobile1 YouTube channel documented three simple and low cost solutions. We all probably know of the vice clamp solution but that is cumbersome and still an expensive solution which is not always very handy or fast. Another solution is to cut a piece of rubber hose in a kind of special way so it is easy to put on and take off the shaft and dangles from a string so it’s always available. The best solution was to use a hitch pin also connected to a string or wire. To make the hitch pin work you have to grind a couple of notches on either side of the lift shaft at just the right spot so the pin can be snapped on and prevent the shaft from retracting at your selected height.

We are sure these solutions will come in handy at some time in most everyone’s driving career. Just after the break we will link to all three of [Brian’s] handy videos on gas strut fix solutions. And if you do your own automotive repair we can definitely recommend [Brian’s] channel of over 600 vehicle repair and maintenance videos which normally come with a dose of philosophy and humor.

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