h:D

Planet

  • Vendredi, Mars 28, 2014 - 06:01
    riotNAS: Mobile Storage for Street Photography

    riotnas1

    You’re likely aware of the protests and demonstrations happening throughout Venezuela over the past few months, and as it has with similar public outcries in recent memory, technology can provide unique affordances to those out on the streets. [Alfredo] sent us this tip to let us know about riotNAS: a portable storage device for photos and videos taken by protesters (translated).

    The premise is straightforward: social media is an ally for protesters on the ground in these situations, but phones and cameras are easily recognized and confiscated. riotNAS serves up portable backup storage via a router running OpenWRT and Samba. [Alfredo] then connected some USB memory for external storage and a battery that gives around 4 hours of operating time.

    For now he’s put the equipment inside a soft, makeup-looking bag, which keeps it inconspicuous and doesn’t affect the signal.  Check out his website for future design plans—including stashing the device inside a hollowed out book—and some sample photos stored on the riotNAS system. If you’re curious what’s going on in Venezuela, hit up the Wikipedia page or visit some of the resources at the bottom of [Alfredo's] site.

    Filed under: digital cameras hacks, Network Hacks

  • Vendredi, Mars 28, 2014 - 06:00
    Teeny-Tiny Tap-Dancers Can Teach You Tricks about Digital Signal Processing #piday #raspberrypi @Raspberry_Pi

    Teeny-Tiny Tap-Dancers Can Teach You Tricks about Digital Signal Processing. From RaspberryPi.org:

    …Here, FFTs are performed on music samples on the Raspberry Pi fast enough to detect a beat, and the Pi relays that information to some teeny-tiny tap-dancers, who produce an automated routine that’s synced to the music.

    These little tap-dancing guys are from a post-Christmas sales bin. They’re called Happy Tappers, and are made by Hallmark, who, for reasons known only to them, include a port which enables them to interface with their tippy-tapping brothers and sisters – which makes for exciting DIY project possibilities once you add something that’s able to feed them an input. I’ve never seen them on sale in the UK, but if you’re dead set on making your own tap-dancing Pi project, they seem to be available online at eBay, Amazon US, and at some Christmas shops….

    Read more.

  • Vendredi, Mars 28, 2014 - 05:00
    Use your pi for automated home brewing @Raspberry_Pi #piday #raspberrypi

    NewImage

    Here’s another great home brewing project using the Raspberry Pi, this time from The Raspberry Pi Hobbyist.

    I have been a “home brewer” in the electronic hobbyist sense for decades, but I am also a “home brewer” of beer. I mentioned this in my post on Reading Temperature With Thermistors.

    I now use digital temperature sensors (typically the DS18B20) read over an I2C bus. Adafruit has a good tutorial on how this is done located here.

    It is fairly common to control a refrigerator and heater to keep a constant (or slowly changing) temperature during the fermenting process, especially with lagers. I have done this using the Raspberry Pi, thermistors, and an A/D convertor. Now, I decided to get a lot more ambitious.

    I won’t go into all the details of the brewing process since there are many resources on the web to provide that. For a quick look at this process, see the article on my photo blog. I wanted to be able to control at least the following items for one of the simpler methods of brewing (called partial mash.)

    • Valve to a tank of propane
    • Grill ignitor to light the burner
    • Sensor to detect if the burner actually did light
    • Temperature sensor for the wort (the brew of water, malt extract, and hops)
    • Pump for circulating water through the wort chiller

    What I needed to do this:

    • A relay to output 12V to control the propane valve
    • Another relay to output much higher amperage of 12V to run the pump
    • A relay connected in place of the button on the grill ignitor
    • A connection for one or more DS18B20 temperature sensors

    Read more and see the full tutorial here.

    NewImage


    Featured Adafruit Products!

    NewImage

    High Temp Waterproof DS18B20 Digital temperature sensor + extras: This is a pre-wired and waterproofed version of the DS18B20 sensor made with a PTFE wire cable. Handy for when you need to measure something far away, or in wet conditions. This sensor is a little more expensive than the other waterproof version we have with a PVC cable because this one can be used up to 125°C – the limit of the sensor itself. Read more.


    NewImage
    Food-Grade Heat Shrink – 3/8″ diameter 12″ long: We decided to stock this food-safe heat shrink specifically for people who were building beer-brewing or sous-vide projects using our waterproof DS18B20+ digital temperature sensors. This heat shrink is FDA Compliant for contact with food. The end of the sensor is stainless steel, but the jacketing is PVC, not good for dunking into your food or drink! But this heat shrink makes it easy – simply slip it on, allowing about 1 cm of the stainless steel sensor cap to be exposed, then heat it up to seal it on. The heat shrink will make a seal over the cap, so that no PVC touches your food project. Read more.

    998Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!

  • Vendredi, Mars 28, 2014 - 03:01
    Laser Cutter Becomes An Etch A Sketch

    etch

    The mirror in a laser cutter moves along an X Y axis. An Etch A Sketch moves its stylus along an X Y axis. Honestly, this laser cutter with Etch A Sketch controls is so obvious, we’re shocked we haven’t seen it before.

    The Etch A Sketch interface is extremely simple – just two rotary encoders attached to laser cut knobs set inside a small, laser cut frame. The lines from the encoders are connected to an Arduino Pro Mini that interfaces with the controller unit on the laser cutter, moving the steppers and turning on the laser only when the head is moving. There’s an additional safety that only turns on the laser when the lid is closed and the water pump is running.

    The circuit is extremely simple, and with just a few connections, it’s possible to retrofit the Etch A Sketch controller to the laser cutter in just a few minutes.  Just the thing for a weekend hackerspace project.

     

    Filed under: laser hacks

  • Vendredi, Mars 28, 2014 - 01:30
    10 Tips for Making Great Build Videos

    A cheap tripod is better than no tripod; for years I used a $15 Sunpak with no complaints. Some fancier models cantilever over your bench, or if your bench is sturdy you can use a clamp-on articulated arm, like my Manfrotto Magic Arm and Super Clamp.Before you get started making project videos to supplement your DIY adventures, snag some solid advice from an old pro.

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 22:54
    Developed on Hackaday: Need Card Art — Who Likes to Draw?

    Our offline password keeper project (aka Mooltipass) is quite lucky to have very active (and very competent) contributors. [Harlequin-tech] recently finished our OLED screen low level graphics library which (among others) supports RLE decompression, variable-width fonts and multiple bit depths for fonts & bitmaps. To make things easy, he also published a nice python script to automatically generate c header files from bitmap pictures and another one to export fonts.

    [Miguel] finished the AES encryption/decryption schemes (using AES in CTR mode) and wrote an awesome readme which explains how everything works and how someone may check his code using several standardized tests. We highly encourage readers to make sure that we didn’t make any mistake, as it was one of you that suggested we migrate to CTR mode (thanks [mate]!).

    On the hardware side, we launched into production the top & bottom PCBs for Olivier’s design. We’re also currently looking for someone that has many Arduino shields to make sure that they can be connected to the Mooltipass. A few days ago we successfully put the Arduino bootloader inside our microcontroller and made the official Arduino Ethernet shield work with it.

    Finally, as you may have guessed from the picture above our dear smart card re-sellers can pretty much print anything on them (these are samples). If one of you is motivated to draw something, please contact me at mathieu[at]hackaday.com!

    On a (way) more childish note, don’t hesitate to give a skull to the mooltipass on HaD projects so it may reclaim its rightful spot as “most skulled“.

    Filed under: Hackaday Columns, hardware

  • Jeudi, Mars 27, 2014 - 22:00
    Full-Size Power Loader Costume Is Ready For Alien Battle

    full size power loader costume

    When you’re already making a life-size statue of the Alien Queen, you may as well build a Power Loader costume to go with it. That’s Instructable user alexthemoviegeek’s attitude, and I applaud his enthusiasm. He wanted the Power Loader to be made as cheaply as possible and also wanted it to be functional. He spent about $225 on materials, and it was well worth it. Though there are many steps to the build, here’s how he made the stilts:

    Two-foot tall stilts need to be very specific. I learned that first-hand. I went to my dad’s garage where he had plenty of spare wood. I made my own design out of whatever pieces I could find. I ended up having to use an air-powered nail gun to secure the pieces of wood together. I could then build up the foam board pieces around the stilts.

    The cage was also a challenge. I’d seen other Power Loader costumes that used connected pieces of PVC pipe, but the problem with that was you could tell it was just pieces of PVC pipe, instead of a single piece of welded metal. I decided to used 1″ PVC pipes and 3/4″ connectors, both with an outer diameter of 1.25″, so that they’d have a singular diameter and look like a solid piece. I had to add some small wooden dowel pieces and hot glue to help strengthen the connections.

    Yes, it’s awesome. Just look:

    Read more at Instructables.

  • Jeudi, Mars 27, 2014 - 21:05
    Thingiverse | Customize a 3D Printed Tree

    CustomizerTree_BlogPost
    3D print a forest of unique, customized trees using Thingiverse Customizer. With about a dozen parameters, the Customizable Tree allows you to easily generate all the flora your inner arborist desires.

    We just upgraded Customizer to a more recent version of OpenSCAD (2013.06), so we created the Customizable Tree to show off some of the new features. It now supports recursion, or the process of repeating similar shapes, in modules and functions and the scaling parameter for linear extrusions which allows the tree branches to taper.

    Additionally, the tree customizer uses a new library we wrote for handling 3D vectors and a small library for converting hue-saturation-value colors to RGB. The 3D vector library comes with some helpful functions for rotating vectors toward other vectors as well as a module for visualizing vector paths.

    Now that we’ve upgraded, we can’t wait to see what kinds of recursive designs you come up with!

  • Jeudi, Mars 27, 2014 - 21:00
    Designing a WakeUp Light

    [Akhil] and his wife recently finished their WakeUp Light project. As the name suggests, this kind of morning alarm uses light to wake you up in the morning. The main constraints when starting this relationship-strengthening adventure were cost, ability to work with any table lamp, and having a simple but effective control interface, all while keeping all the design open. The created platform (put in the wooden box shown above) is built around a Stellaris Launchpad (ARM Cortex M4 based) and uses an AC dimmer circuit found in this instructable. For our readers interested in those, [Akhil] mentions two very interesting articles about their theory of operation here and here.

    An Android application has been made to set up all the alarm parameters, which uses the phone’s Bluetooth to communicate with the (well-known) HC-05 Bluetooth transceiver connected to the Launchpad. For safety, the current design also includes an LM4876 based audio amplifier connected to the microcontroller’s PWM output. The next revision will integrate a Digital to Analog Converter and an SD-Card slot for better quality and music diversity. A presentation video is embedded after the break and you can find the official repository at GitHub.

    Filed under: ARM, hardware, lifehacks

  • Jeudi, Mars 27, 2014 - 19:55
    New Project: Arduino Monsterbot

    Mopsey the MonsterbotWhat can this bot do? What do you want it to do?

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 19:52
    MakerBot Retail | Eva’s Fantastical Furniture Springs to Life

    Retail Operator Header

    Upgrading the Design Process
    Industrial Designer Eva Arnason fell in love with furniture making as a student at the Massachusetts College of Art and Design. Now that Eva is the Assistant Manager at the MakerBot Retail Store in Boston, she’s taking her love of furniture design to the next level by incorporating desktop 3D printing into her creative process.

    “I had been making furniture the old-fashioned way at a small custom furniture store that specializes in desks and shelving. When I heard MakerBot was opening a store in Boston, I wanted the opportunity to get back into the digital side of design.”

    Retail Operator Blog

    Under Pressure
    For her most recent project, Eva incorporated the natural contours of a piece of wood into a table. However, she needed to ensure her abnormally shaped table could support weight from any angle. So Eva created a 3D printed prototype on a MakerBot Replicator 2 Desktop 3D Printer. She used this miniature table prototype to test the strength of her design by putting pressure on various points across the table’s surface. Now she can design the perfect base for her creation before cutting a single piece of wood.

    “I used to spend hours making small wooden prototypes by hand,” says Eva. “Now I can use 3D printing to quickly test my designs before creating them.”

    Visit Eva and the rest of the crew at the MakerBot Retail Store on 144 Newbury St, Boston, MA. And don’t forget to explore our vast collection of ready-to-print content on MakerBot Thingiverse, the 3D design community for discovering, printing, and sharing 3D models.

     

  • Jeudi, Mars 27, 2014 - 19:11
    Book review – Learn to Program with Scratch

    LearnScratchScanThe next generation of Scratch programming guidebooks are appearing on the scene and this one is a keeper.

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 19:00
    Design for 3D Printing: Prepping mechanical parts for 3D printing for Shapeways #3DThursday #3DPrinting

    Pasted Image 3 27 14 1 41 PM

    Here’s an interesting resource for how to prep files for printing mechanical parts using Shapeway’s printing service. I’m highlighting the Clearance as I found the discussion pertinent to many forms of printing, with a special consideration for SLS.

    Prepping mechanical parts for 3D printing for Shapeways:

    Designing mechanical parts for 3D printing
    What you need to know.

    Through these pictures and explanations we hope to give you a better understanding on how to design mechanical parts for 3D printing.

    • maintain a wall thickness of at least 1mm,
    • accuracy is 0.1mm,
    • always keep a clearance of 0.6mm
    • and parts may have a deviation of 0.2mm.

    When designing something mechanical that has to be 3D printed or when adding a mechanical feature to your model there are several main considerations.

    Clearance

    Clearance, the distance between a door and the door frame when the door is shut. If you make a peg with a diameter of 3mm and a hole with a diameter of 3mm, the peg will not fit into the hole. There has to be some kind of clearance at play for it to work.

    The amount of clearance would depend on the functionality of the part. The higher the clearance, the more likely it is to fit. When developing complex moving mechanical parts though, the more clearance the more inefficient the part. A good balance between clearance and efficiency is crucial for your design decisions. If you have a gear, gearbox or spring I would try to go for minimum clearance. When designing any other assembly I would go for more clearance. The minimum clearance is 0.6mm at all times. Do not go below this number or your parts will fuse.

    The reason why clearance is especially important when designing things for White, Strong & Flexible(Selective Laser Sintered parts) is because the laser melts the SLS powder and then fuses it. This coupled with the shrinkage means that if you do not get clearance right your part will fuse. So not only will it not fit exactly right it will all get stuck together and will not work at all.

    Read More.

    Shapeways


    649-1
    Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

    Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!

    The Adafruit Learning System has dozens of great tools to get you well on your way to creating incredible works of engineering, interactive art, and design with your 3D printer! We also offer the MakerBot Digitizer in our store. If you’ve made a cool project that combines 3D printing and electronics, be sure to let us know, and we’ll feature it here!

  • Jeudi, Mars 27, 2014 - 18:45
    New Project: Vintage Bulb Lamp

    x06-bulbs-on-on-blackSwitch on the nostalgic glow with this dimmable, modern table lamp.

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 18:01
    Fail of the Week: Secret Agent-Style Book Hideaway

    fotw-book-hideaway-with-laser-cutter

    Ah, the movies are an inspiration for so many projects. How many times have you seen a spy movie where a cutout in the pages of a book are hiding something? This was the inspiration which led [Paul] and his crew to try using a laser cutter to remove a handgun-shaped cutout from the pages. The fail began before the project even got started. The sacrificial book they had chosen was too thick to cut directly so they tore it in thirds for the cutting process.

    The hijinks are portrayed well in the clip after the break. The infectious giggling as this first trace of the laser cuts the outline makes the video worth watching. As they try to go deeper, the success falls off rapidly. This makes for a great Fail of the Week discussion: Why can’t you cut through multiple layers of a book with a laser cutter? Is this merely a focal length issue that would be solved with a higher-end cutter or is there something else at play here. Let us know what you think by leaving a comment below.

     

    [Thanks Bob]


    2013-09-05-Hackaday-Fail-tips-tileFail of the Week is a Hackaday column which runs every Wednesday. Help keep the fun rolling by writing about your past failures and sending us a link to the story – or sending in links to fail write ups you find in your Internet travels.

    Filed under: Fail of the Week, Hackaday Columns, laser hacks

  • Jeudi, Mars 27, 2014 - 18:00
    New Project: Smart Cocktail Shaker

    With full weight on the scale, adjust the amplifier gain until the output is about 5 volts.Build a smart cocktail shaker with help from an Arduino.

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 17:32
    Quickly Prototype Circuits With New Inkjet-Printable Conductive Ink

    agic_1Skip the messy breadboards and PCB etching and jump straight to testing your circuit layout on paper.

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 17:24
    New Project: DIY Hacks & How To’s: Remote Control with an Arduino

    IMG_1766Most of the buttons on a remote control are never used. So why not use them to control appliances and other electronics around your house. In this project, I am going to show you how to use an Arduino to decode the signal from your remote and use it to […]

    Read more on MAKE


  • Jeudi, Mars 27, 2014 - 17:15
    Flying probe tester! (video) – APEX EXPO #adafruitAPEX @IPCShow #IPCshow #apexexpo

    Flying probe tester! (video).


    What is APEX?

    Thousands of industry professionals from more than 50 countries attend this premier event— featuring advanced and emerging technologies in printed board design and manufacturing, electronics assembly, test and printed electronics! Find new suppliers with new solutions and connect with colleagues from around the world.

    There is even a hand soldering competition on Weds 1pm to 4pm at booth 2713 (more special events here).

    Adafruitapex
    This year’s show brochure is here follow along our coverage on Twitter @adafruit with the tag #adafruitAPEX here is the mobile version of the schedule, directory and more.

  • Jeudi, Mars 27, 2014 - 17:03
    FKN Systek K7000 Thin Blade Circular-Linear Blade Depanelizer – APEX EXPO #adafruitAPEX @IPCShow #IPCshow #apexexpo

    Fknsystek

    We are at the APEX EXPO looking for a PCB depanelizer, we are checking out the FKN Systek K7000 Thin Blade Circular-Linear Blade Depanelizer. Video above!

    The K7000 is a circular linear blade depanelizer developed to singulate  prescored PCBs with very tight component spacing. The linear blade is 12″ (304mm) long and has a .030″ (.762mm) thin symmetrical cutting edge designed particularly for PCBs with closely spaced components. The circular blade is 3.8″ (71mm) in diameter and has the same cutting edge profile as the linear blade. (.030″.762mm ) This blade is mounted on a  shaft with the center line of the cutting blade passing directly through the middle of the support bearing.

    Cut panels to 12″ Long
    Weight: 20 lbs (9.6 Kgs.)
    Blade Thickness : .030″

    Adafruit 2808

    Learn more & PDF.


    What is APEX?

    Thousands of industry professionals from more than 50 countries attend this premier event— featuring advanced and emerging technologies in printed board design and manufacturing, electronics assembly, test and printed electronics! Find new suppliers with new solutions and connect with colleagues from around the world.

    There is even a hand soldering competition on Weds 1pm to 4pm at booth 2713 (more special events here).

    Adafruitapex
    This year’s show brochure is here follow along our coverage on Twitter @adafruit with the tag #adafruitAPEX here is the mobile version of the schedule, directory and more.

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