Welcome to Doodadica.com
We’re just getting started here, so keep checking back for more.
Coming soon: discussion forums!
We’re just getting started here, so keep checking back for more.
Coming soon: discussion forums!
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.
This Item also available from Amazon:
Here’s a list of some Pringles Can innovations that go beyond just storing things:
What do you do?
(Answer on page http://www.reuk.co.uk/Pringle-Tube-VAWT-Wind-Turbine-Plans.htm)
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.
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.)
Here’s a selection of high-tech T-shirts that herald our entry into a new era of fashion, or something:
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.
Copy Machine In Your Pocket

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

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.
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.
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!

The Vegawatt Power System
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.
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.
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