hackaday.com Archives - 18 April 2013, Thursday

  • Pulse Oximeter from LM324, LED, and Photodiode: This pulse oximeter is so simple and cheap to build it’s almo...

    Pulse Oximeter from LM324, LED, and Photodiode

    hackaday.com 18 Apr '13, 9pm

    a concept we’ve seen a few times before . The light from an LED shines through your finger and is measured on the other side by a phototransistor. It’s that light grey plastic thing you see on a patient’s finger when they’re in the hospital. [Scott] went with a common wooden clothes p...

  • Living night light with glowing algae

    Living night light with glowing algae

    hackaday.com 18 Apr '13, 8pm

    M father, an ex Navy man, has told me stories of glowing water since I was little. Being a person who was obsessed with all things that light up this always stuck with me. I saw a headline one day that someone was making an algae-light. Sadly when I clicked on it, the algae was just t...

  • Semi-automatic pick and place machine

    Semi-automatic pick and place machine

    hackaday.com 18 Apr '13, 7pm

    The machine is built in two parts. The portion in the upper left feeds components from reels and is fully automated. The portion on the lower right consists of a padded arm-rest which slides smoothly along two axes. A mechanical arm with multiple articulations is attached to the end, ...

  • Hidden servo automates slat-style window blinds

    Hidden servo automates slat-style window blinds

    hackaday.com 18 Apr '13, 1pm

    The image above is a screenshot from the demo which you can watch after the break. The top enclosure for the blinds is just shown at the top of the frame. Here [HA] is demonstrating a few different control designs which he has been trying out. You can see what looks like a Molex conne...

  • Upgrade a toy keyboard’s tone production

    Upgrade a toy keyboard’s tone production

    hackaday.com 17 Apr '13, 9pm

    His preliminary investigation of the stock components yielded a mystery uC encased in a blob of black epoxy. He wasn’t going to be getting anywhere with that, so he started by figuring out how to use 4051 multiplexers to read all of the keys. Outputs for that were routed to a 20 pin h...

  • 3D Printing sensor mounts for the Oculus Rift

    hackaday.com 17 Apr '13, 7pm

    While browsing an oculus rift thread on reddit, I saw someone mention how nice it would be to have some actual mounts for external sensors on their Rift. The idea is that adding additional sensors or cameras will allow us to expand the capabilities of the rift. With something like the...

  • Apple MagSafe cord repair

    Apple MagSafe cord repair

    hackaday.com 17 Apr '13, 7pm

    [Tommy Ward] had a big problem with the cord for his laptop power supply. This thing’s not cheap so he figured out a way to fix the frayed cord on his Apple MagSafe . He asserts that the shortened rubber collar on the plug end of the cord is to blame for this type of damage. We think ...

  • Hackerspace security system brings RFID, video feedback, and automatic doors

    hackaday.com 17 Apr '13, 1pm

    It’s not that it’s not gonna run as it should but it has quite a few flaws to have acceptable reliability. I understand it’s a system for fun-first,but i will just state my opinion so you get food for thought,i design alarm systems for quite a few years now so i hope you’ll find a few...

  • Hacked together Mac isn’t a hackintosh

    Hacked together Mac isn’t a hackintosh

    hackaday.com 16 Apr '13, 9pm

    As we’ve so often been caught doing, [Flippy] was browsing eBay for deals. It’s a dangerous activity because you end up falling into purchases like an Aluminum iMac for $35. That led to the purchase of a very slim LED LCD monitor to use as the display. It fits perfectly behind the iMa...

  • Building a kegerator with visual style

    Building a kegerator with visual style

    hackaday.com 16 Apr '13, 7pm

    Chest freezers are perfect for these builds as their top door design helps keep the cold air inside to boost the efficiency. The trick is to modify them without messing up the insulating properties of the appliance housing. [GMMN's] approach is a common one, build a cuff to go in betw...

  • Tube radio husk gets a web radio transplant

    Tube radio husk gets a web radio transplant

    hackaday.com 16 Apr '13, 1pm

    [Dominic Buchstaller] found this German Greatz tube radio at a flea market. It only cost him about €35 and was in a bit more rough condition than the finished product you see above. He also found that a portion of the original circuitry was missing, making it completely non-function. ...

  • Original hardware for fifteen consoles jammed into recently completed Project Unity

    Original hardware for fifteen consoles jammed into recently completed Project Unity

    hackaday.com 15 Apr '13, 9pm

    This is definitely an impressive piece of work! I admit that I shook my head a bit, though, when he said that he used original hardware because that would be how the games were meant to be played. He definitely has a point with emulation accuracy, For some games this makes an importan...

  • New post: [FlorianH] shows off MinimaBL, the next generation of his quadcopter project

    [FlorianH] shows off MinimaBL, the next generation of his quadcopter project

    hackaday.com 15 Apr '13, 7pm

    You’ll find some outdoor flight demo clips after the break. Right off the bat we’re impressed at the rock solid stability of the quadrotor while in flight. Even indoors the last version had a hint of a wobble as the control loop calculated stabilization. Here he borrowed some code fro...

  • Glowing Easter eggs more fun than a dye job

    Glowing Easter eggs more fun than a dye job

    hackaday.com 15 Apr '13, 1pm

    The project still has one foot in the old tradition as it starts by blowing out the eggs. The larger hole on the bottom, which was used to evacuate the yoke an albumen, ends up being just the right size to insert an LED. You could simply hook these up to a battery and resistor, but [R...

  • Hackaday Links: Sunday, April 14th, 2013

    hackaday.com 14 Apr '13, 9pm

    We figure we have to start off this week’s links post talking about PETMAN. Boston Dynamics shows off the humanoid robot donning a full chemical suit . It’s a lot scarier than when we first saw it as a couple of legs a few years ago [Thanks Joshua]. Seeing something like that might dr...

  • New post: Building a replacement for a broken dehumidifier controller

    Building a replacement for a broken dehumidifier controller

    hackaday.com 14 Apr '13, 7pm

    We’ve thought of doing a project like this ourselves as the dehumidifier we ordered online runs the fan 24/7 no matter what the humidity conditions. But it wasn’t that [Davide Gironi] was unhappy with the features on his unit. It’s that the dehumidifier controller stopped working so h...

  • Teaching a computer to play Mario… seemingly through voodoo

    Teaching a computer to play Mario… seemingly through voodoo

    hackaday.com 14 Apr '13, 1pm

    The link above includes his whitepaper, but we think you’ll want to watch the 16-minute video (after the break) before trying to tackle that. In the clip he explains the process in laymen’s terms which so far is the only part we really understand (hence the reference to voodoo in the ...

  • @ToRo yo hice esta me costo 20 pesos y funciona muy bien.

    HDTV antenna that can hang in a window

    hackaday.com 14 Apr '13, 3am

    I’m certainly no expert on antennas, but I’m pretty sure a “HDTV antenna” doesn’t exist, just a marketing term like “color TV antenna”. In markets where there are no HDTV broadcasts, and DTV share the airwaves with the reaming low power analog UHF stations it’s simply a TV antenna.No ...

  • SqueezeBerry: a Raspberri Pi powered Squeezebox appliance

    SqueezeBerry: a Raspberri Pi powered Squeezebox appliance

    hackaday.com 13 Apr '13, 9pm

    Since Logitech announced that it was terminating the Squeezebox line we’ve seen several projects which take up the torch. We’ve seen the RPi used as a Squeezebox server and several embedded Linux systems used as clients . This follows in the footsteps of the latter. The RPi is running...

  • Working 3D printed stepper motor

    Working 3D printed stepper motor

    hackaday.com 13 Apr '13, 7pm

    Most 3D printers use stepper motors to control the movement of the extruder head. If you could actually print those motors it would be one more big step toward self-replicating hardware. Now obviously [Chris Hawkins'] working 3d printed stepper motor wasn’t built 100% through 3D print...

  • Network-controlled fireworks launcher

    Network-controlled fireworks launcher

    hackaday.com 13 Apr '13, 1pm

    [Thomas] and his friends wanted to ring in the new year by setting off some fireworks. To keep a safe distance and have a little fun they built this network controller launcher (translated ). the image on the left shows the build in its unused and pristine state. But by the end of the...

  • Generating electricity from alcohol

    Generating electricity from alcohol

    hackaday.com 12 Apr '13, 9pm

    The build is passively cooled, using a sync assembly that takes advantage of heat pipes to help increase the heat dissipation. A nearly flat heat sink makes up the mounting surface for the hot side, which faces down toward a flame driving the generator. [x2Jiggy] started the project b...

  • New post: Horribly complicated electric guitar keyboard

    Horribly complicated electric guitar keyboard

    hackaday.com 12 Apr '13, 7pm

    So let’s dig into the house of cards he built for the project. It starts off with the guitar which has been fitted with an additional pickup to interface with a Roland GR-33 synthesizer pedal. That outputs a MIDI signal, which many hackers would have connected to the computer and pars...

  • Build your own air-powered Star Trek "whoosh" doors

    Star Trek inspired pocket doors

    hackaday.com 12 Apr '13, 5pm

    I noticed people talking about the safety of getting caught between the doors but what about that fact that he cut out the header over the door,the 2 header support studs, and the 2 full run studs along the header supports. One way or another, be it directly or indirectly, that is a l...

  • Jeep Wrangler gets pressurized water right out of the bumper

    Jeep Wrangler gets pressurized water right out of the bumper

    hackaday.com 12 Apr '13, 1pm

    If you want running water you’ve got to have a place to put it. This is actually what sparked the idea for the project. [Ed] noticed that the bumper was hollow and had some drain holes on the bottom. After plugging those and adding a fill hole to the top he found that he had a reservo...

  • Hacking the Oculus Rift: the Oculight

    hackaday.com 11 Apr '13, 9pm

    Our Oculus Rift finally arrived in the mail. I’ll spare you my thoughts on the item itself other than to say it is amazing. There are tons of videos to choose from that show people’s thoughts and reactions, and Ifixit has their usual detailed teardown as well. The mod I decided to tac...

  • Automating a mechanical typewriter

    Automating a mechanical typewriter

    hackaday.com 11 Apr '13, 9pm

    It would have been much easier to patch into an electric typewriter, but we have seen the string trick used on those as well . In this case a loop of string attaches to the the bar under each key, allowing a pull from below to type the character. An automotive door lock actuator ([Har...

  • Top 10 best hacking scenes in movies

    hackaday.com 11 Apr '13, 8pm

    Geeking out and complaining about inaccuracies is fun. But it is like junk food. Too much is bad for your health. We’ve done the Top 10 worst portrayals of hacking in movies /TV as well as a Part 2 due to high demand. Now it is time for the good stuff. Take it in and feel those health...

  • Guitar EQ levels trigger the stage lights

    Guitar EQ levels trigger the stage lights

    hackaday.com 11 Apr '13, 7pm

    the hack that adds an EQ display for a pedal board he got the idea to convert the concept as control hardware instead of just for feedback. Just like the visualization project he uses an MSGEQ7 chip which takes care of the audio analysis. He’s using this for electric guitar so he only...

  • A motorized snowboard: Because, you know, it's not like there's gravity or anything to move you along

    Snowboard propulsion system motors you through the flats

    hackaday.com 11 Apr '13, 2pm

    One advantage that skiers have always had over snowboarders is the ability to move through flat sections with ease. [Matt Gardner] built this prototype to help even the playing field. When he would normally need to kick, hop, or remove the board and walk he can now engage his snowboar...