Halloween is coming and [Paulo] decided to make some flickering jack-o-lanterns by hijacking the flickering circuit of a cheap LED tea light to drive a much more powerful light!
He has tons of old 12V incandescent bulbs collecting dust, so he decided to make use of them for some holiday fun. He wondered if he could steal the circuit from the flickering LED tea lights and use them to drive the incandescents. Upon taking the LED tea candle apart, he discovered there was no circuit, as it was in fact embedded in the LED itself! Not to worry though, he simply integrated the flickering LED into his circuit! Coupling a capacitor with the LED, he used a transistor amplifier to take the signal, and then finally boosted it using a MOSFET to drive the light bulbs. He then powered the entire thing using an old laptop power brick. Nice one [Paulo]!
Do you have any cool Halloween hacks? Don’t forget to send them in to the tip line! For other pumpkin fun, check out last year’s Pumpkin Tetris!
LED Marquee Pumpkin
Here’s an LED marquee as the mouth of a Jack-o’-lantern which [Mike Skoczen] made. This comes hot on the heels of that playable Tetris Pumpkin. [Thanks Jacob]
Arduino-powered robot costume
This is a sideways view of the Arduino-powered costume [Dan] and his wife made for their son. It has lights, buttons, a character display, and makes noise.
Cylon Centurion from a pumpkin
Stuck inside because of the hurricane, [Shawn] and his girlfriend carved this Cylon Centurion pumpkin complete with lights and sound.
8×8 LED costume ‘face’
[Matthew] built this helmet which features an 8×8 RGB LED matrix as the face. He calls it the digital reaper. You can see him testing the electronics in this clip.
Makerspace costume roundup
[Jeff] wrote in to tell us about the Halloween preparations at the Port City Makerspace in Portsmouth, New Hampshire. Here we have a Ghost Busters Proton Pack, weeping angel wings from Dr. Who, and an Arc Reactor from Ironman.
Capacitive touch plants
Here’s a proof of concept for using plants as a capacitive touch sensor. The sensor is simply a hunk of double-sided copper clad board attached to a microcontroller. But it seems to be able to sense what part of the plant is being touched. [Thanks Fabien]
Adding wireless charging to a Nokia N900
This hack is quite common, but it’s still fun to see what hardware is being outfitted with an inductive charger. This time it’s a Nokia N900 that’s ditching the charging cables.
Wii carrying suitcase from a plastic tackle box
This Wii carrying case (translated) looks great and cost just a few bucks. It started as a tackle box for carrying around your fishing lures. But a bit of creative cutting and there’s a place for everything.
Browser based schematic and board layout
There’s a new kid on the block when it comes to circuit design. Circuits.io offers in-brower schematic design and board artwork layout. [Thanks ADIDAIllinie (and a few others)]
Halloween rapidly approaches and we hope that [Tim’s] carving of Bender in a pumpkin will inspire you to send in your own Halloween projects.
This Halloween table will sing a sweet serenade to spook your guests. Each of the animatronic pumpkins were quite easy to build, but you may end up spending a bit more time choreographing the performance.
Inside each Jack-o-lantern you’ll find a custom Arduino compatible board called a Minion board. These include a wireless connection which lets the system sync with the computer playing the audio. The pumpkins are fake, which means that can be reused year after year (unlike our LED matrix inside a real pumpkin). The mouth is connected to a servo with a short piece of bent wire, allowing it to flap along with the words of a song. You can see a performance of the Ghostbusters theme in the clip after the break.
A custom GUI was written in C# to aid in the choreography. It handles the playback of the song, with a few buttons that can be used to record the light and mouth effects. This ‘recording’ is then used to drive the pumpkins during a performance.
Continue reading “Singing pumpkins”
Now we know why kids in this neighborhood wear plastic Halloween masks instead of just painting their faces. They’re trying to protect themselves from the onslaught of hard candy spewing out the front of this candy chucking pumpkin.
The mechanism operates very much like a baseball or football throwing device. Now that we think of it, it’s also the same concept as the chicken launcher. There is a feed shoot that drops the projectile into the grips of two spinning chuckers. Those chuckers are built out of a couple of fans, with layers of fabric to account for different sizes and shapes of candy.
The video after the break shows some test firing. We love the sickening ‘whap!’ that the Werther’s Original (or whatever crappy Halloween offering they’re using) makes when it slams into the wall of the room.
This thing’s just begging to be mounted on a parade float, don’t you think?
Continue reading “Candy chucker – weapon, or advanced Halloween delivery system?”
This one would make a nice centerpiece for your Halloween party. It’s a battery with tiny pumpkins serving as the cells. [EM Daniels] shows us how to clear out the pumpkins, fill them with some freshly mixed electrolyte, and he even throws in the directions for baking the pumpkin seeds.
Each pumpkin will need a pair of conductors made of dissimilar metals to serve as the anode and cathode. Copper wire is used for one, aluminum for the other, and both wires have a spiral pattern bent on one end to increase the surface area that contacts the electrolytic solution. Now just boil up a slurry of vinegar, gelatin, and salt, then let it sit in the fridge over night. [EM Daniels] was able get 1.5V out of this project (enough to light one LED) for two hours, and 1.4V for six hours by using seven of the pumpkin cells in series.
What takes eight hours to solder and uses more shrink tubing that you thought imaginable? An LED matrix installed in a real pumpkin. When I mentioned that we’d like the LED pumpkin in last Friday’s post scaled up to a full LED matrix I had no idea it would be me doing the work. But [Caleb] and I thought it might be just the thing to present for the hacker’s favorite holiday.
Installed in the autumn vegetable is a marquee made from a 5×14 matrix of light emitting diodes. I spaced them by printing out a grid on the computer, taping it to the pumpkin, and drilling 70 holes in the front of the thing. The real trouble came when inserting all of the LEDs from the inside; each of them has four wires soldered to it, creating a net of black wiring. Above you can see it turned out great. This is a shot of it scrolling the message HAPPY HALLOWEEN.
Join us after the break for video of this prop. But we’re not just sharing the finished product. I’ll take you through the build process. Along the way you’ll learn the design considerations that go into an LED matrix and how you can use these techniques to build your own in any size and configuration you desire.
Continue reading “70 LED matrix in a Jack-o-lantern”