Halloween is just around the corner, and the spooky themed tips are just starting to roll in. If you’re looking to one-up the basic store-bought decorations, and maybe teach your kid the basics of an Arduino while you’re at it — why not build a Peek-A-Boo Ghost!
Using an Arduino, two servo motors and an ultrasonic distance sensor it’s pretty easy to make this cute little ghost that covers its eyes when no one is around. They’re using cardboard for the ghost, but if you have access to a laser cutter at your hackerspace, you could make it a lot more robust using MDF or plywood.
When the ultrasonic distance sensor senses someone coming towards it, it’ll trigger the arms to move — though it’d be easy to add a small speaker element too and get some spooky music going as well!
Continue reading “BOO! Teach Arduino Basics With this Fun Ghost”
Halloween may have come and gone, but [Luis] sent us this build that you’ll want to check out. An avid Walking Dead fan, he put in some serious effort to an otherwise simple bloody t-shirt and created this see-through “stomach shot” gunshot wound.
The project uses a Raspi running the Pi Camera script to feed video from a webcam on the back of his costume to a 7″ screen on the front. [Luis] attached the screen to a GoPro chest harness—they look a bit like suspenders—to keep it centered, then built up a layer of latex around the display to hide the hard edges and make it more wound-like. Power comes from a 7.4V hobby Lipo battery plugged into a 5V voltage converter.
After ripping a small hole in the back of his t-shirt for the webcam and a large hole in the front for the screen, [Luis] applied the necessary liberal amount of fake blood to finish this clever shotgun blast effect.
Have some servos and an Arduino lying around? It isn’t too late to get your freaky on! Last night, tech enthusiasts of Las Vegas gathered at Pololu Robotics to show off their hacks for a Halloween flavored edition of their bi-monthly robot club. These projects created by those in the community as well as the Pololu engineers themselves are fun and have a relatively short list of materials. So, if the examples below give you some inspiration, this is permission to Macgyver something together before your big Halloween party tonight…
Impatient Severed Fingers – [Amanda] came up with a cute use for some mini servos and a zombie hand prop. The five severed fingers were attached to one end of a plastic rod. The other end was mounted to each of five servos which were laid out in the appropriate hand shape and attached to a fixed base. An Arduino running a basic sweep sketch animated the motors at slightly staggered intervals, creating a nice rolling effect. Even with the moving parts exposed this prop would be awesome to have on display, or set the ambiance with its continuous tapping…
Angry Spectral Delta – [Nathan Bryant] made an actual costume for his delta robot from Robot Army. By attaching a small plastic skull to the end effector and draping a tattered piece of fabric over the rest of the mechanism he effectively transformed the delta into a little ghost with a sassy personality. The head swiftly bobbed about, all while staying parallel to the table… until it intermittently came unhinged and hung limply, which was a nice added effect!
Robotic Exorcism Baby – This doll could turn its half skeleton, half baby face 180 degrees and then laugh at your fear. By attaching two servo motors together, [Jeremy] was able to create a pan and tilt mechanism which acted as the baby’s contorting neck and chattering jaw. The micro controller sending commands to the motors was hidden modestly under her dress.
Stabby Animated Cardboard Shadowbox – Among the animatronic devices seen at the event was a shadowbox made by [Brandon] hidden in a dark conference room nearby. When one happened to walk past the seemingly unoccupied space, they’d glimpse the silhouette of an arm stabbing downward with a knife through a windowsill. Being lured in for further investigation you’d find that the shadow was being cast by some colored LEDs through a charmingly simple device. A cutout made from recycled card stock was attached to a single servo. This whole mechanism itself rocked back and forth slightly as the motor moved, which wasn’t intentional but added some realism to the motion of the stabby arm.
There were many interesting projects present last night ranging from remote-controlled skeletal arms to other reactive devices ready to deliver a scare. If you’re interested in knowing more, those made by the Pololu crew are documented on their blog. Since video does these projects better justice, you can check out a compilation of clips here:
Continue reading “Halloween Hack Night at Pololu”
[Stephpalm] had carved a pumpkin for the first time in two decades. Unfortunately, the neighborhood squirrels were all too pleased with her work and devoured it. Her original goal for the jack-o’-lantern was to have its lights controlled over the internet. These hungry critters inspired another project instead – The Jack-’o’-Lantern Squirrel Early Warning System. There have been hacks that have dealt with pesky squirrels before, such as a trap and an automatic water turret, but they didn’t have the ability to post to social media like this system does.
The system consists of a Spark Core, a passive infrared (PIR) sensor, and a piezo buzzer. When the motion sensor is triggered the buzzer sounds, scaring away any peckish creatures lurking nearby. [Stephpalm] used an NPN transistor and 1k-Ohm resistor to provide enough current to drive the buzzer. All of these components were connected using jumper wires and a breadboard that sits on top of the pumpkin. As a nod to her original idea, [stephpalm] then created “Pumpkin Watch Code” and loaded it into the Core. It posts preset messages to a Twitter account every 45 minutes of inactivity or whenever a pesky squirrel is detected. The messages can be personalized for anyone who wants to make one of these themselves.
We wonder if it would be better to place the breadboard inside the jack-o’-lantern and carve out a couple of holes on top for the PIR sensor’s wires to come out of. That would offer some protection from the elements and prevent it from getting knocked over. We think this project could be adapted for many other uses. After the break, see a video of the system in action!
Continue reading “Scare off Squirrels and Tweet about It with the Jack-O’-Lantern Warning System”
If you’re new to hacking, Halloween is a great excuse to get started, and [Chuck] has put together an inexpensive animated Halloween decoration that you can show off on your front door. After scoring a $5 plastic Halloween doorknocker from Wal-Mart, [Chuck] gathered together a small pile of components and then set about breathing some life (death?) into its scary but motionless face.
Though he opted to use a Digispark, you should be able to use any Arduino that is small enough to stuff inside the plastic head. [Chuck] cut some holes in the eyeballs and glued in two RGB LEDs, then cobbled together a quick-and-dirty mount in the mouth area to hold a small servo. The lights and the servo are wired to the Digispark, which turns the lights on and instructs the servo to slam the ring against the door. It’s is battery powered and currently has only two settings: on or off. This should be good enough to scare the kids for this year, but [Chuck] has plans to add a much-needed motion sensor and sound via a Bluetooth connection.
As simple as this build is, it could be just the thing to get you in the holiday spirit, or to introduce the young hacker in your home to the world of electronics and coding. Check out the short video of the doorknocker after the break, then swing by [Chuck’s] website for detailed build instructions and his Github for the source code. If you’re having trouble finding this doorknocker at Wal-Mart, [Chuck] recommends a similar one on Amazon. Don’t stop now! Make some Flickering Pumpkins too, or if you want a challenge, hack together your very own Pepper’s Ghost illusion.
Continue reading “Halloween Doorknocker Decoration Hack”
If you had a few too many trick or treaters hitting up your house this year, [phwillys] has a solution guaranteed to keep them from coming back. He was looking for a way to scare the crap out of the trick or treaters this past Halloween, so he constructed a remote-controlled evil jeep to terrorize the neighborhood.
The jeep was built from an old PowerWheels car, and uses a bunch of different motors to get the effect [phwillys] was looking for. He bought a linear actuator on eBay to let him steer the jeep, which is controlled using some motor controllers he had left over from another project. A salvaged car window motor was used to allow evil clown driver to turn from side to side in his seat, while a pair of car seat motors activate the giant claws built into the sides of the vehicle. The jeep’s hood was even turned into a chomping mouth with large teeth using yet another small motor.
[phwillys] also added a water sprayer to the clown’s mouth, soaking any kids in the immediate vicinity, though he was nice enough to mount a leaf blower on the opposite side of the vehicle to help blow them dry.
It really is an awesome creation, we’re sure the neighborhood kids (and parents) got a big kick out of it. Continue reading to see a short video of his scary clown car in action.
Continue reading “Halloween Hacks: An evil R/C clown car for terrorizing the neighborhood”
[monkeysinacan] wanted to add a fog machine to his Halloween display, but he says that the cheaper consumer-grade models are pretty unruly beasts. He cites short duty cycles and tricky fog control as his two biggest gripes with these sorts of foggers. He decided make the fogging process a little more manageable, and modified his to only generate fog when someone was walking nearby.
One obvious concern with this sort of setup is the warm-up time required to get the device ready to produce fog. If it were to only turn on when someone walked by, [monkeysinacan] would miss his mark each and every time. To ensure that his machine was accurate, he rigged it so that the heat exchanger stayed powered on, triggering the fog juice pump as needed.
To do this, he used an ultrasonic sensor similar to, but cheaper than a Parallax Ping unit. Paired with an Arduino, the sensor triggers the fog machine’s pump for 20 seconds whenever anyone gets within 6 feet of it.
While he hasn’t posted video of the modified fogger at work, it sounds like a solid plan to us.