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A place for tech-heads and DIYers

Welcome to Doodadica.com

Doodadica.com is a place for Doodadiphiles, Gadgeteers, DIYers, Tinkerers, Brainstormers, Barnstormers, Inventers, Malcontents, Futurists, Greenies, Geeks, Gearheads, Wireheads, Hackers, Packrats, and whoever else wants to generally tweak and/or hack the world or things within it, take things apart, and/or put them together, and/or create, innovate, modify, trick out, tweak, build, hone, repurpose, and/or invent stuff.

We’re just getting started here, so keep checking back for more.

Coming soon: discussion forums!

DIY Batteries

Lemon batteries have never really been more than a curiosity of science fairs and kids’ home invention kits. They’re cool, but who wants to carry around three lemons to light up an LED?

The projects in the Instructable below by madeaon might not make the lemon battery as useful as a button cell, but it does get it down to around the same size, and provides some great inspiration to the DIYer. Plus, these things are practically works of art. According to the author, the more simple designs can power an LED for about an hour on a drop or two of lemon juice (and can be recharged with more lemon juice), while some of the larger batteries can provide power for a month and a half using dishwashing soap as an electrolyte. Check out the instructable for several creative battery designs, including a neat little hydrogen battery.


The Tiny Lemon Battery, and other designs for zero cost electricity and led light without batteries - More DIY How To Projects



Mobile Phones


ChinaVision Projector Phone
-Tri-Band GSM/GPRS Touchscreen Cell Phone

(See blog entry)

Special Price (as of 3/20/09): $254.25

Projector Phone - Tri-Band GSM/GPRS Touchscreen Cell Phone

This Item also available from Amazon:

DIY Wonder Materials, Vol. 1: The Pringles Can

As the first in a series of blogs on the art of re-purposing household items, I’ve chosen the highly hackable Pringles can. Invented by Proctor and Gamble scientist, Frederic Bauer, the Pringles can has become an icon of American food-packaging ingenuity, but it does more than hold overlapping hyperbolic paraboloid-shaped chips. Aside from some of the less exciting secondary uses like storing tennis balls, yarn and paint rollers (seal them in a can and put in fridge between uses. The roller will be good to go for days), the humble Pringles can has become a go-to platform for frugal DIY innovators. Perhaps it’s fitting that after Bauer passed away on May 4th of last year, he pioneered yet another use for his invention when his remains (or part of them) were buried in one.

Here’s a list of some Pringles Can innovations that go beyond just storing things:

    Wind Turbines

  • The Pringles Can Vertical Axis Wind Turbine (VAWT):
    Hypothetical question: Your plane goes down on an uncharted island. You must get through the sonic fence erected by some weird hippie types years ago to keep out the hostile natives. Sayid tells you he thinks he can jam the fence’s sensors with your walkie if he can just get his hands on a 6V, 120ma power source to recharge its batteries. All you’ve managed to salvage from the wreckage is some magnet wire and magnets, a couple of Wham CDs, a paper towel holder, a tube of Pringles, a magnifying glass, and a hot glue stick.

    What do you do?

    (Answer on page http://www.reuk.co.uk/Pringle-Tube-VAWT-Wind-Turbine-Plans.htm)

  • The DIY Pringles Can Windmill:
    Looking for a more conventional Pringles can wind turbine? Here’s how to cut a Pringles can to fashion the blades and hub:
    http://www.persistentrealities.com/pringles

    Culinary

  • The Pringles Can Solar Hot Dog Cooker:
    Make shuttle bay doors on the Pringles can about large enough to expose a hotdog, fold out the doors so inner foil reflects sun into “cargo bay” area, put skewer through lid and bottom with hotdog and oven bag. Place in full sun for about 30 minutes.
    Here’s a video from Louisiana4H:
  • Make Lollipops:
    Cut Pringles can in half, put holes in sides near bottom for air to get in, place bottom of Pringles can over small candle, use can bottom as cooking surface, place sugar on surface, melt sugar, put toothpick in sugar, let cool. (Note: The bottom of the Pringles can is the metal part. Doodadica.com strongly advises against using the plastic lid as a cooking surface. Doodadica.com testers inform us that this simply does not work.)
    Here’s the video: http://www.wonderhowto.com/how-to/video/how-to-make-homemade-lollipops-with-a-pringles-can-235497/


    Photography

  • A DIY snoot (yes, a snoot: Basically a device used by photographers to create a spotlight effect with a flash):
    Trace the shape of the flash on the metal bottom, and (carefully) cut the shape out and squeeze the flash in there.
    Recommended: spray paint the interior matte black to avoid reflections from the shiny surface creating extra rings in your spotlight.
    Optional: Put the lid on the other end to act as a diffuser.
    See example here.
  • A Macro Lens:
    Take a camera body cover (the lens cap-like thing that protects the inside of the camera when no lens is attached), dremel it out and sand it down, cut a hole in the bottom of the can so that the body cover fits snugly and glue it in place, take a Canon EF 50mm f/1.8 II Camera Lens (I actually own one of these, and for $85, it’s a surprisingly good lens) and wrap it in black fabric and duct tape until it fits snugly in the can. (You focus by sliding the lens inside the tube.) Now attach your new Pringles lens to the camera, and you’re ready to take high quality, extreme close ups.

    Recommended: Dremmel out the lens cap and attach it to the lens so that you can more easily manipulate the lens once inside.
    See example here.

    Just for fun:

  • The Pringles Can Cannon:
    If for some reason you need some means of firing tennis balls across your neighborhood, this video (apparently based on a design from the classic tome of adolescent anarchy, Backyard Ballistics) will show you how to cut up and tape a couple of Pringles cans together to make a handheld launcher.
    (Note: This device operates by exploding gas at high pressure inside cylindrical cardboard tubes designed to hold potato chips and should be considered very dangerous–or lethal–to both the operator and bystanders. Doodadica.com recommends you do not attempt to build or operate this device unless the firing of high velocity tennis balls is absolutely necessary and no safer means is available to you.):
    http://www.youtube.com/watch?v=ifndrankb1E
  • Smoking things:
    Pringles can hooka (or shisha):
    Here’s a Youtube video by dmcwebd on how to make a hooka using a Pringles can, and all those spare hooka parts you have laying around:
    http://www.youtube.com/v/givwNF_OIKU&hl=en&fs=1

    Pringle’s Can Bong (of course): Video from Daisukekun01:



    (Note: Inhaling burning particulates of any type may be hazardous to your health, and is often illegal because it creates excuses for governments to increase their funding and powers. Doodadica.com does not endorse or recommend the use of homemade burning particulate producer/inhaler-sort of devices, or indeed of professionally made ones.)




The future is here, and it’s machine washable.

I’ve always kept a vague little list in my head of indicators that would tell me when “the future” had arrived. I checked off some of those the first time I placed a 1 gb micro sd card on my fingertip (I remember being completely astounded in my younger days when my friend’s dad purchased a 10 MEGABYTE hard drive. How in God’s name could any single person fill all that space?), I checked off a couple more the first time I saw an iphone in action. And I realized I had to check off another one the other day when I saw my first Wi-Fi detecting T-shirt.

Here’s a selection of high-tech T-shirts that herald our entry into a new era of fashion, or something:

    Wi-Fi Detector Shirt

    Wi-Fi Detector Shirt

  • 1. The Wi-Fi Detector ShirtCurrently on sale for $20 at thinkgeek, it’s like some magic item from a D & D game. This shirt effectively casts “Detect Wi-Fi” on you, as your chest lights up with glowing blue bars indicating signal strength wherever you happen to be standing.
    (Another version is available from Nerdseven.com)
  • 2.The Personal Soundtrack ShirtCurrently selling for $39.99, this shirt features a working speaker on the front, a wired controller, and is pre-loaded with sound effects and mood music suitable for most of life’s dramatic occasions. But if you’ve just got to have “Desperado” or some Vader breathing, or the endlessly applicable “Doh!” on hand, you can pop in an SD card, or just plug your ipod into the input jack.
  • T-Qualizer Classic

    T-Qualizer Classic


  • 3. The T-Qualizer - This sound sensitive shirt features an equalizer readout, giving realtime feedback on your accoustic environment. Nerdseven carries several versions of this shirt, at $35 ea. (about $5 cheaper than the one at thinkgeek).
  • 4. The Electronic Drum Kit ShirtNow you can play friggin’ drums on your friggin’ shirt, and they really make drum sounds! Talk about useful! Your world literature teacher will be thrilled.
  • 5.FlashWear Anim8 Pong!
    FlashWear Anim8 Pong!

    FlashWear Anim8 Pong!

    - At some point in our lives, haven’t we all asked ourselves, “How long do I have to wait before someone makes a T-shirt that plays pong with itself?” The wait is over. You can’t actually play pong on it, but if you’re with a group of friends and you’re really desperate for entertainment, you can stand before them, hands on hips, smirk on lips, nodding confidently as they all wait with baited breath to see which side wins.
    (Note: Doodadica.com recommends growing a killer mustache before attempting this pose, unless you’re female, in which case Doodadica.com recommends gum chewing instead.)
    (Note: Gambling is often illegal and ill-advised. Doodadica.com recommends that you do not gamble on the outcome of the pong shirt.)
  • Links:
    NerdSeven.com
    ThinkGeek Apparel

DIY USB-Powered Fridge

Here’s a “cool” project: Get a Peltier Thermo-Electric Module, a couple of heat sinks, a usb cable, and some foam-core board. Throw it all together (see video below), and you have a usb-powered mini-fridge.


DIY $5 Mini USB Fridge!

Afterthought: A normal “12 volt” solar panel puts out around 18 volts, which exceeds the rating of the peltier unit I linked to above, but I wonder if a 5v solar USB-charger like the one below would put out enough juice (about .6 amps) to make a solar-powered mini-fridge for camping.

Three Bad-Ass Pens

The Pen. What could be more ordinary? Sure, occasionally James Bond will use some cool tricked out pen to off someone or cut his way into a submarine or something, but by and large, the pen has not realized its true potential in our lives. But it’s starting to. Here are a couple of bad-ass pennovations that can be had for under 50 bucks (and one about 5 times that):

Copy Machine In Your Pocket
IOGear Digital Pen & USB Receiver-Captures your Handwriting
Okay, this is cool. Here’s the concept: Write on a piece of paper with this pen. You now have a piece of paper with what you’ve written or doodled, AND a digital copy of the exact same thing on your PC. No need for a tablet or any other stuff; just the pen (which uses “ordinary ink refill”) and the wireless receiver which plugs into a usb port. An awesome tool for journalists, or anyone who relies on their notes.
Geeks.com currently sells the wireless IOGear Digital Penfor $48.97.

 

 
Video Pens
4GB USB MP9 Digital Pocket Video Recorder Ballpoint Pen w/Built-in pin-hole Camera and Microphone (Black/Silver)
Geeks.com is selling this little beauty for $49.99. It’s a functional ball-point pen using standard refills, but it can also surreptitiously record color AVI video files (with audio) onto its 4GB internal memory and later dump them via USB onto a PC. Perfect for the minimalist spy, or for sleepy students, bootleggers (Important Note: Do Not Bootleg. Bootlegging is Illegal.), expose’ journalists, and I dunno, lots of criminal-types (Important Note: Do not engage in criminal-type stuff. Criminal-Type stuff is widely reported to be illegal), cops, perverts (Important Note: Do not be a pervert. Perverts are widely disliked, and perverted behavior is often illegal), and people who just think a video pen would be hella cool to mess around with.

 

Wireless Spy Camera Pen - Included Solar Charger Currently selling for $263.13, this one is pricier, but Chinavision’s Wireless Spy Camera Pen wins major points because this video pen, you see, comes with a Solar Panel. And as anyone knows, you can’t stop a spy with a solar panel. Go ahead, take Radio Shack away, strand him in the desert. He’ll keep coming at you, fully capable of surreptitiously documenting all of your misdeeds. He just needs a few hours of sunlight, and his secret DVR pen is back in action. You can’t put a price on that.

But that’s not all that distinguishes this super spy pen. Instead of storing it’s data on the pen itself, it transmits video and audio to a wireless receiver (which you can also use to watch the video live–in case you need to peek around a corner without being seen, or set up an impromptu surveillance post in enemy territory–or play it back later to blackmail the bad guy’s gardener into helping you, or something), and because the video is not stored on the pen itself, if you’re captured, you just say, “Aww, Man! Ya got me,” and you hand over the pen. Then, you wait for your moment to escape with the real data, safely duct-taped to your groin.

That really seems to be the only thing missing actually. I’m going to suggest that they include the duct-tape in future versions.

 

 


Be Cool - Shop @ Geeks.com

Yes, that IS Darth Vader on my toast.

Darth Vader Toaster
Now you and your entire family can witness the power of this fully armed and operational, umm, toaster.

That’s right, the Darth Vader Toaster (currently a Hutt’s Ransom at $54.99, but hey, this badboy makes Darth-friggin-Vader Toast!) is expected to be available sometime next month from StarWarsShop.com which is of course taking pre-orders now.

No journey to the dark side is ever truly complete until you can reverently smear blueberry jam across Lord Vader’s faceplate and devour his likeness.
Did I just type that?


Click Here to See StarWarsShop.com Sale Items!


Fry Power

The Vegawatt Power System

The Vegawatt Power System

If your restaurant generates 80 gallons of waste vegetable oil in a week, instead of sealing it in barrels and paying someone to haul it away, you can now pour it into a magical device that will provide you with 5 kilowatts worth of electricity and hot water.

The Vegawatt is the creation of James Peret, a garage inventor who came upon the idea after he converted his truck to run on used vegetable oil.  It uses essentially the same process, only the waste oil is used to power a generator and the heat from combustion is recaptured to pre-heat water going to the restaurant’s water heater.  

And it’s environmentally friendly.  According to the company’s website, the generator, which is certified to Tier 4 EPA emissions standards (the strictest), “is 5% cleaner than the cleanest power plant, 53% cleaner than a fuel-oil generator and 60% cleaner than the majority of power plants in the USA.”

Only installed in one restaurant so far, the $22,000 device (also available for a five year lease of $450/month) is estimated by its inventor to save about $1,000 per month in electricity costs converting the restaurant’s used cooking oil into a commodity worth $2.55 a gallon, and paying for itself in about two years.  Plus it comes with a two year warranty, and routine maintenance is thrown in free of charge.  Not a bad deal.  
Go ahead, give me a reason to order the fried apple pie.  

Build a Solar Powered Trike

Found on instructables.com: Solar Powered Trike

This solar-powered trike design by dpearce1 looks like a relatively simple project, and cheaper than just about any other solar-powered vehicle project I’ve seen.


Solar Powered Trike - More DIY How To Projects

This project should be buildable with the following items, plus a hub motor and throttle controller (dpearce1 used one from goldenmotors.com), some high-pressure bicycle tubes, and a 36 volt charge controller (if I locate one, I’ll link to it), for around $900-$1000.

Run Your Car on Trash

Found on instructables.com: Convert your Honda Accord to run on trash

This is a great instructable on running a car with a gasifier. Gasification is a very interesting, and potentially very useful process and deserves to be looked into more.


Convert your Honda Accord to run on trash - More DIY How To Projects