Halloween is right around the corner and just about every Halloween project needs some kind of motion sensor. Historically, we’ve used IR and ultrasonic sensors but [Makers Mashup] decided to use an ESP32-Cam as a motion sensor in his latest animatronic creation. You can see a video of the device and how it works below.
The project is a skull that follows you around with a few degrees of motion on a stepper motor. There’s a 3D-printed enclosure to make the hardware assembly easy. The base software was borrowed from [Eloquent Arduino].
What is it about useless machines that makes them so attractive to build? After all, they’re meant to be low-key enraging. At this point, the name of the game is more about giving that faceless enemy inside the machine a personality more than anything else. How about making it more of a bully with laughter and teasing? That’s the idea behind [alexpikkert]’s useless machine with attitude — every time you flip a switch, the creature of uselessness inside gets a little more annoyed.
In this case the creature is Arduino-based and features two sound boards that hold the giggles and other sounds. There are three servos total: one for each of the two switch-flipping fingers, and a third that flaps the box lid at you. This build is wide open, and [alexpikkert] even explains how to repurpose a key holder box for the enclosure. Check out the demo after the break.
Microsoft’s Kinect, a motion-sensing peripherial originally for the Xbox 360, is almost exactly a decade old now. And in that decade it has expanded from its limited existence tied to a console to a widely-used tool for effective and detailed motion sensing, without breaking the bank. While it’s seen use well outside of video games, it’s still being used to reimagine some classic games. In this project, Reddit user [SuperLouis64] has used it to control Mario with his own body.
While the build still involves some use of a hand controller, most of Mario’s movements are controlled by making analogous movements on a small trampoline, including the famed triple jump. The kinect is able to sense all of these movements and translate them into the game using software that [SuperLouis64] built as well. The trickiest movement seems to be Mario’s spin movement, which appears to have taken some practice to get right.
We appreciate the build quality on this one, and [SuperLouis64]’s excitement in playing the game with his creation. It truly looks like a blast to play, and he even mentions in the Reddit thread that he’s gotten a lot of productive excercise with his various VR and augumented reality games in the past few months. Of course if this is too much physical activity, you could always switch to using your car as the unique game controller instead.
When walking down a dark street, it’s common to get a sense that one is being followed. It pays to check, of course, but what if we could get better data than simply a vague feeling from the unknown? [caitlinsdad] built a project that can do just that, with a cute pair of ears to boot.
The werewolf ears claim to be ISO Standard, though we’re yet to see the relevant documents to bear that out. Regardless, they use an Adafruit Gemma M0 microcontroller to run the show, hooked up to an infrared proximity sensor to detect movement. When triggered, the Gemma responds to the signal by twitching the wolf ears attached to a headband, alerting the wearer that someone is closing in.
Built and calibrated properly, this could be a useful invention for those who regularly find themselves followed by those skulking on the sidewalk and for whom moving to another neighbourhood is a more expensive option. We’ve seen other responsive wearables, too. Video after the break.
The idea behind a dummy security camera is that people who are up to no good might think twice about doing anything to your property when they think they’re being recorded. Obviously a real security camera would be even better, but sometimes that’s just not economically or logistically possible. Admittedly they’re not always very convincing, but for a few bucks, hopefully it’s enough to make the bad guys think twice.
But what if that “fake” camera could do a little more than just look pretty up on the wall? [Chris Chimienti] thought he could improve the idea by adding some electronics that would notify him if motion was detected. As an added bonus, any would-be criminals who might be emboldened by the realization the camera itself is fake might find themselves in for a rude surprise when the notifications start firing off.
In the video after the break, [Chris] really takes his time walking the viewer through the disassembly of the dummy camera. As it turns out, these things look like they’d make excellent project enclosures; they come apart easily, have nothing but empty space inside, and even have an integrated battery compartment. That alone could be a useful tip to file away for the future.
He then goes on to explain how he added some smarts to this dummy camera. Up where the original “lens” was, he installed a PIR sensor, some white LEDs, a light sensor, and the original blinking red LED. All of this was mounted to a very slick 3D printed plate which integrates into the camera’s body perfectly. The new hardware is connected up to a similarly well mounted Wemos D1 Mini inside the camera. The rest of the video goes through every aspect of the software setup, which is sure to be of interest to anyone who’s ever thought of rolling their own IoT device.
We love our props here at Hackaday, and whenever we come across a piece from the Back To The Future fandom, it’s hard to resist showcasing it. In this case, [Xyster101] is showing of his build of Doc Brown’s Flux Capacitor.
[Xyster101] opted for a plywood case — much more economical than the $125 it would have cost him for a proper electrical box. Inside, there’s some clever workarounds to make this look as close as possible to the original. Acrylic rods and spheres were shaped and glued together to replicate the trinity of glass tubes, 3/4″ plywood cut by a hole saw mimicked the solenoids, steel rods were sanded down for the trio of points in the centre of the device and the spark plug wires and banana connectors aren’t functional, but complete the look. Including paint, soldering and copious use of hot glue to hold everything in place, the build phase took about thirty hours.
The LEDs have multiple modes, controlled by DIP switches hidden under a pipe on the side of the box. There’s also motion sensor on the bottom of the case that triggers the LEDs to flicker when you walk by. And, if you want to take your time-travel to-go, there’s a nine volt plug to let you show it off wherever — or whenever — you’re traveling to. Check out the build video after the break.
Back in 2015 [Ben Wang] attempted to re-invent the protoboard with the Perf+. Not long afterward, some improvements (more convenient hole size and better solder mask among others) yielded an updated version which I purchased. It’s an interesting concept and after making my first board with it here are my thoughts on what it does well, what it’s like to use, and what place it might have in a workshop.
The Perf+ is two-sided perfboard with a twist. In the image to the left, each column of individual holes has a bus running alongside. Each hole can selectively connect to its adjacent bus via a solder bridge. These bus traces are independent of each other and run vertically on the side shown, and horizontally on the back.
Each individual hole is therefore isolated by default but can be connected to one, both, or neither of the bus traces on either side of the board. Since these traces run vertically on one side and horizontally on the other, any hole on the board can be connected to any other hole on the board with as few as two solder bridges and without a single jumper wire.
It’s an innovative idea, but is it a reasonable replacement for perfboard or busboard? I found out by using it to assemble a simple prototype.