Quick Hack Creates A Visual Beep Alarm

Sometimes a simple modification is all it takes to get something just the way you want it. The Ikea LÖTTORP clock/thermometer/timer caught [Mansour Behabadi’s] eye. The LÖTTORP  has four functions based on its orientation. [Mansour] loved the orientation feature, but hated the clock’s shrill beeping alert. Visual beeps or alarms can be handy when working with headphones or in a loud environment. With this in mind [Mansour] decided to crack his LÖTTORP open and rewire it to produce a visual beep for the timer function.

The clock is backlit, so [Behabadi] decided to use the backlight for his visual beep. Once the inside was exposed, [Behabadi] noticed that the buzzer’s positive terminal was wired to the red LED anode — a clever design choice, since the red LED is only used with the clock function. Simply removing the buzzer and soldering its terminal to the noticeable green LED provided the desired effect.

We meant it when we said he cracked it open. The screws were hidden behind the front plate, so the handyman’s secret weapon helped in reassembling the clock after this quick hack.

We’ve featured plenty of classy, unique, and ingenious clocks on Hackaday, so this modification is in good company.

Characterizing a Death Ray… er, Solar Oven

Many of you will probably at some point have looked at a satellite dish antenna and idly wondered whether it would collect useful amounts of heat if you silvered it and pointed it at the sun. Perhaps you imagine a handy source of  solar-cooked hotdogs, or maybe you’re a bit of a pyromaniac.

[Charlie Soeder] didn’t just think about it, he did it. Finding a discarded offset-focus DirecTV dish, he glued a grid of 230 inch-square mirror tiles to it and set to investigating  the concentrated solar energy at its focus. 

Cotton waste, newspaper, and scraps of fabric char and burn with ease. A cigarette is lit almost from end to end, and it burns a hole right through a piece of bamboo. Most of the energy is in the form of light, so transparent or reflective items need a little help to absorb it from something dark. He demonstrated this by caramelizing some sugar through adding a few bits of charcoal to it, once the charcoal becomes hot enough to caramelize the sugar around it the spreading dark colour causes the rest of the sugar to caramelize without further help.

Solar furnace calculations
Solar furnace calculations

To gain some idea of the power of his solar furnace, he recorded a time series of temperature readings as it heated up some water darkened with a bit of charcoal to absorb heat. The resulting graph had a flat spot as a cloud had passed over the sun, but from it he was able to calculate instantaneous power figures from just below 30W to just below 50W depending on the sun.

He records his progress in the video you’ll find below the break. Will we be the only ones casting around for a surplus dish after watching it?

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Hackaday Prize Entry: Automated Hydroponics

This team project for the Hackaday Prize is a solution to a rather important problem. Imagine growing plants for use as biomarkers for pollution. It’s a great idea, but how do you grow the plants in the first place? This team is building a space-saving hydroponic system that packs the most green into the least amount of space. It’s simple, and can be built almost entirely with parts from the local home supply store.

The design of this hydroponic system is based on a few PVC pipes, arranged vertically, joined together with a few 90 degree bends. In each course of pipe, a few holes are drilled to accept a plastic cup. This cup is filled with some sort of growing medium, and the Genuino-based controller takes care of everything else. Watering the plants, turning the lights on and off, and recording the nutrient concentration of the water is all possible with a simple microcontroller.

Right now the team has a huge stack of perforated PVC pipe and a Genuino-based brain box that takes care of everything plants need. It’s going to take a bit of time for the plants to grow, but this is still one of the most compact hydroponic systems we’ve seen.

You can check out a video of the entire setup below.

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Working in Peace With an Off-Grid Office Shed

Finding a good work space at home isn’t a trivial task, especially when you’ve got a wife and kid. A lot of us use a spare bedroom, basement, or garage as a space to work on our hobbies (or jobs). But, the lack of true separation from the home can make getting real work done difficult. For many of us, we need to have the mental distance between our living space and our working space in order to actually get stuff done.

This is the problem [Syonyk] had — he needed a quiet place to work that was separated from the rest of his house. To accomplish this, he used a Tuff Shed and set it up to run off-grid. The reason for going off-grid wasn’t purely environmental, it was actually more practical than trying to run power lines from the house. Because of the geology where he lives, burying power lines wasn’t financially feasible.

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Add Robotic Farming to Your Backyard with Farmbot Genesis

Growing your own food is a fun hobby and generally as rewarding as people say it is. However, it does have its quirks and it definitely equires quite the time input. That’s why it was so satisfying to watch Farmbot push a weed underground. Take that!

Farmbot is a project that has been going on for a few years now, it was a semifinalist in the Hackaday Prize 2014, and that development time shows in the project documented on their website. The robot can plant, water, analyze, and weed a garden filled with arbitrarily chosen plant life. It’s low power and low maintenance. On top of that, every single bit is documented on their website. It’s really well done and thorough. They are gearing up to sell kits, but if you want it now; just do it yourself.

The bot itself is exactly what you’d expect if you were to pick out the cheapest most accessible way to build a robot: aluminum extrusions, plate metal, and 3D printer parts make up the frame. The brain is a Raspberry Pi hooked to its regular companion, an Arduino. On top of all this is a fairly comprehensive software stack.

The user can lay out the garden graphically. They can get as macro or micro as they’d like about the routines the robot uses. The robot will happily come to life in intervals and manage a garden. They hope that by selling kits they’ll interest a whole slew of hackers who can contribute back to the problem of small scale robotic farming.

A Grounded Option for the Jet-Setting Homebody

Over the course of 10 years, [Bruce Campbell] has built himself a sleek pad out of a Boeing 727-200 in the middle of the picturesque Oregon countryside.

As you’d expect, there are a number of hurdles to setting up a freaking airplane as one’s home in the woods. Foremost among them, [Campbell] paid $100,000 for the aircraft, and a further $100,000 for transportation and installation costs to get it out to his tract of land — that’s a stiff upfront when compared to a down payment on a house and a mortgage. However, [Campbell] asserts that airplanes approaching retirement come up for sale with reasonable frequency, so it’s possible to find something at a lower price considering the cost of dismantling an airframe often compares to the value of the recovered materials.

Once acquired and transported, [Campbell] connected the utilities through the airplane’s existing systems, as well going about modifying the interior to suit his needs — the transparent floor panels are a nice touch! He has a primitive but functional shower, the two lavatories continue to function as intended, sleeping, dining and living quarters, and a deck in the form of the plane’s wing.

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This Motorless Pull-Behind Mower is Made From Junk

Cutting a field of grass is a straightforward and satisfying process, given a suitably powered mover. A tractor with a rotary topper to hang on its three-point linkage and power-take-off will make short work of the task.

[Donn DIY] had an agricultural quad-bike, but when it came to mowing its lack of a power-take-off meant it wasn’t much use. When he saw a home-made mower for a quad-bike online he had to give it a go himself, and came up with his own take on a mower made from junk.

He started with the rear axle and differential from a Russian built Lada, which he reconditioned, before mounting in a wooden jig with its input shaft pointing upwards. He then made a frame for three mower shafts, onto which he mounted his custom-made rotors and their machined bearing housings. Some pulley machining, and he could then link the rotor shafts to the differential with a series of V-belts and a further shaft to step up the rotor speed.

He wasn’t finished there, after the rotors came a lever mechanism for lifting the cutters off the ground, and a pair of weight baskets to ensure traction was maintained. The result is a mover that takes its drive from its wheels, and cuts grass very effectively when towed behind the quad-bike. The unguarded blades would probably give a farm insurance assessor an apoplexy, but for the purposes of the video below the break at least we can see everything.

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