Transparent Alarm Clock Runs Linux

[Benoit] was using an extremely old alarm clock which normally ran on mains power, and he plugged it in to his computer’s UPS to keep it operational during power outages. He noticed that when the UPS switched on that the clock would run fast, though, and apparently it was keeping time by watching the power system frequency. To solve this problem he created his own feature-dense clock which runs Linux.

This alarm clock has everything: seven-segment displays housed in clear epoxy, a touch interface, battery backup, the ability to retrieve the time from an NTP server, and a web interface to change the clock’s settings over the network. That was a large part of [Benoit]’s decision to have the clock run Linux; the network capabilities add a lot of functionality to the clock like the ability to send commands to other devices at particular times. The clock runs on an Aria G25 SOM and has a custom case that looks very professional.

We’re suckers for a high-quality clock builds here, and [Benoit]’s most recent project hits all of our buttons. Even though it doesn’t currently drive people insane or tell confusing time, the Linux and networking capabilities could certainly open up options!

Juice-Spewing Wind Turbine Bootstrapped from Bike Parts

Wind Turbines are great, they let us humans harness the energy of the wind. Wind is free and that is good, but spending a ton of money on a wind turbine setup begins to make the idea less appealing. [Ted] has spent many years building low cost wind turbines and this one is not only simple but can be made from mostly found parts.

It’s easy to identify the main rotor hub and blade frame which are made from an old bicycle wheel. The blades are standard aluminum flashing normally used in home construction and are attached directly to the spokes of the bike wheel. Mounted below the bike rim is a permanent magnet motor that acts as a generator. A belt couples the motor to the main rotor and uses the tire-less rim as a pulley.

[Ted] has strapped this beast to the roof of his car to measure how it performs. At 12 mph, he’s getting between 18-20 volts at 2 amps. Not too bad! Bikes and bike parts are cheap (or free) and there is no surprise that they have been used in wind turbine projects before, like this one that hangs from a kite.

Interactive Fur Mirror Follows Your Every Move

We think artist [Daniel Rozin] spent a bit too much time wondering if he could make an interactive fur mirror, without wondering if he should. The result is… strange — to say the least.

It’s called the PomPom Mirror, and its one of many interactive installations in the Descent With Modification at Bitforms — there’s even a super cute flock of penguins which spin around to create the same effect.

The mirror is 4 by 4 feet and 18″ deep. It has 928 faux fur pom poms which are controlled by 464 motors, each effectively with an “on” and “off” state. A Microsoft Kinect tracks movement and creates a black and white binary image of what it sees. The artist also programmed in a few animation sequences which make the mirror come alive — like some weird furry alien / plant thing…

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Ducted Fan Drone Uses 1 Rotor for VTOL

Multi-rotor fixed-pitch aircraft – quad, hexa, octa copters – are the current flavor of the season with hobby and amateur flight enthusiasts. The serious aero-modeling folks prefer their variable-pitch, single rotor heli’s. Defense and military folks, on the other hand, opt for a fixed wing UAV design that needs a launch mechanism to get airborne. A different approach to flight is the ducted fan, vertical take-off and landing UAV. [Armin Strobel] has been working on just such a design since 2001. However, it wasn’t until recent advances in rapid-prototyping such as 3D printing and availability of small, powerful and cheap flight controllers that allowed him to make some progress. His Ducted Fan VTOL UAV uses just such recent technologies.

Ducted fan designs can use either swivelling tilt rotors that allow the craft to transition from vertical flight to horizontal, or movable control surfaces to control thrust. The advantage is that a single propeller can be used if the model is not too big. This, in turn, allows the use of internal combustion engines which cannot be used in multi-rotor craft (well, they’ve proven difficult to use thus far).

[Armin] started this project in 2001 in a configuration where the centre of gravity is located beneath trust vectoring, giving the advantage of stability. Since there were no hobby autopilots available at the time, it was only equipped with one gyroscope and a mechanical mixer to control the vehicle around the vertical axis. Unfortunately, the craft was destroyed during the first flight, after having managed a short flight, and he stopped further work on it – until now. To start with, he built his own 3D printer – a delta design with a big build volume of 400mm3. 3D printing allowed him to build a structure which already included all the necessary mount points and supports needed to fix servos and other components. The in-fill feature allowed him to make his structure stiff and lightweight too.

Intending to build his own auto-pilot, he experimented with a BeagleBone Black connected to a micro controller to interface with the sensors and actuators. But he wasn’t too happy with initial results, and instead opted to use the PixHawk PX4 auto-pilot system. The UAV is powered by one 3-cell 3500mAh LiPo. The outside diameter of the duct is 30cm (12”), the height is 55cm (22”) and the take-off weight is about 1.2kg (2.6 pound). It has not yet been flown, since he is still waiting for the electronics to arrive, but some bench tests have been conducted with satisfactory results. In the meantime, he is looking to team up with people who share similar interests, so do get in touch with him if this is something up your alley.

If you want to look at other interesting designs, check this UAV that can autonomously transition from quadcopter flight to that of a fixed-wing aircraft or this VTOL airplane / quadcopter mashup.

Hacklet 49 – Weather Display Projects

Everyone wants to know what the weather is, and what it is going to be. Today’s internet enabled forecasts give us continuous streams of current weather data and predictions from any of several computer models. Couple that with data from an on-site station, and you’ve got a lot of information to display! It makes sense that weather display projects would be popular with hackers, makers and engineers. What do you do after you build the worlds most awesome clock? Build the worlds most awesome weather display (and then incorporate a clock in there as well!).

Last week on The Hacklet I mentioned that there are two basic types  of weather projects on Sensing and Display projects. There was a bit of foreshadowing there, as this week’s Hacklet covers some of the best weather display projects on!

geoWe start with [Ashley Hennefer] and G.E.O, a project which is out of this world – literally. Geological Environment Observer, or G.E.O was created for NASA’s Space Apps Challenge. G.E.O’s mission is to keep astronauts on long-distance space flight missions connected with their home city (and planet). An astronaut programs the device with their home city and G.E.O takes it from there. Inside a glass globe, G.E.O creates weather patterns mirroring the programmed city. It does this with Adafruit NeoPixel LEDs, a water pump, a mist generator, and a wave shield. An Intel Edison controls the system. For now, weather data and programming are completed using a web interface. Once G.E.O launches though, data will be streamed via NASA’s deep space network.

flaps[Sephen DeVos] keeps track of the weather with a glance at his Internet Split Flap Weather Clock. Lots of weather apps use simple icons to display the current conditions. [Sephen] placed those icons on a mechanical split flap display which lets him know the conditions outside. The project’s case came from a donor clock given to [Sephen] by his parents. He then 3D printed an entire split flap mechanism, including the gears! Each 50 mm x 100 mm flap forms half an image.  A small stepper drives the flaps, while an IR detector lets the system know when it has reached a home position. Control is handled by an Arduino Nano and companion Ethernet shield. The Arduino checks the weather every 30 minutes. If conditions have changed, it flips to the right icon. Genius!

usmap[Dan Fein] is keeping track of the temperature across the entire USA with Weather Map. [Dan] works for Weather Underground, so it’s no surprise that he uses their API (accessed via a node.js script) for weather data. The data is fed into a spark core which then drives a string of 100 WS2812 LEDs. Each LED is mapped to a specific point in the continental USA. Color indicates the current temperature at that location. [Dan] does caution that you’ll have to slow down access to Weather Underground  if you’re using a free API key. Even with slower updates, this is still an awesome project!

yaws[Jeff Thomas] went the traditional route with YAWS – (Yet Another Weather Station). YAWS uses a 5 inch TFT LCD to display weather data from a number of sensors. [Jeff] got his display and the driver board from The driver board uses the venerable RA8875 display driver chip. The RA8875 handles all the hard parts of driving an LCD, like video RAM, refresh, and clocks. This allows a relatively slow Arduino to drive all those pixels. [Jeff] created a very handsome interface to display all his data, but he has a small problem – a memory leak causes the system to freeze up every 18 hours! We’re hoping [Jeff] will share his source code so the community can help him find that pesky bug!

If you want to see more projects like these, check the Weather Display Projects list on That’s it for this week’s Hacklet, As always, see you next week. Same hack time, same hack channel, bringing you the best of!

50 Shades of Gray Water Reuse

Entered into this year’s Hackaday Prize, [TVMiller] built a super cheap Arduino powered gray water recovery system.

The system is very simple and can be easily made for almost any bathroom. By making a zig-zag of PVC pipe underneath the sink, he’s created a simple grey water reservoir sized for his toilet’s flushing capability.  And if you use too much water, it just backs into the drain — think of it as a giant P-Trap! A 12V solenoid and 240L/h water pump switch on after the toilet has been flushed — refilling the tank with reused gray water! He’s also added an Arduino and an LCD screen to keep track of the water saved; with the nice touch of a HaD logo of course.

We love [TVMiller’s] project brief build logs — he doesn’t hold anything back.

Pipes were glued, the inhaled toxins coursing through my lungs and penetrating the cells, turning me in an enhanced human, now capable of lifting small things with great ease, like a stapler or Big Gulp.

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Model House Models House, Vice-Versa

[Eric Tsai] is on a home-automation rampage. Not content with the usual smartphone-based GUIs, [Eric] built a cardboard model house that models his house. Open the garage door, and the model house’s garage door opens. Open the real front door, and a tiny servo motor opens the cardboard front door.

The model house also comes with a power meter that represents his current power usage, which is certainly useful for figuring out if something electronic has gone grossly wrong. You should watch the video (found after the break) all the way through, here’s the spot where he turns on an electric leaf blower. Despite a little big of lag that’s pretty cool!

But the system doesn’t stop there. Since he can control the garage door and some lights remotely via WiFi, the next logical step is to add a couple of buttons so that the model house can control the real house.

We’ve covered [Eric]’s home before. He set up simple, Arduino-based sensor packages all around his house, connected them together through the pub/sub framework MQTT and added in the open-source OpenHAB software interface. The door sensors connect to a hacked Wink hub. From whether or not his dog is barking to whether his laundry is done, [Eric]’s system knows it all.

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