How do you keep people out of your change jar? If you didn’t say with a 3D printed iris mechanism and high-voltage spark gap, then clearly you aren’t [Vije Miller]. Which is probably for the best, as we’re not sure we actually want to live in a world where there are two of these things.
Regular Hackaday readers will know that [Vije] has a way of using electromechanical trickery to inject a bit of excitement, and occasionally a little danger, into even the most mundane aspects of life. His latest project is an automated change jar that uses a pinpad to authenticate users, while everyone else gets the business end of a spark gap if the PIR sensor detects them getting to close.
You can see a demonstration of the jar in the video after the break, where he shows the jar’s ability to stop…himself, from getting access to it. Hey, nobody said it was meant to keep out real intruders. Though we do think a similar gadget could be a fun way to keep the kids out of the cookie jar before dinner, though we’d strongly suggest deleting the high-voltage component from the project before deploying it with a gullet full of Keebler’s best.
[Vije] was able to adapt a printable iris design he found on Thingiverse to fit over the mouth of the jar, and uses servos in the base to rotate the whole assembly around and open it up. The internal Arduino Nano handles reading from the pinpad, controlling the stepper, and of course firing up the spark generator for 1000 milliseconds each time the PIR sensor detects somebody trying to be cute. Just the sound of the arc should be enough to get somebody to reconsider the value of literal pocket change.
Some of the design elements used in this change jar’s high voltage components were influenced by the lessons learned when [Vije] was building his plasma-powered toilet air freshener. There’s a sentence we bet you never expected to read today.
Continue reading “High Voltage Protects Low Denominations”
Despite the title, this isn’t a tale of conversing with Michael Jackson’s chimp. Rather, it is about [KyungYun]’s machine that transforms speech into whimsical bubbles. While the speech control is novel, we were more fascinated with how the mechanism uses a system of strings to blow bubbles, along with the workmanship to make the device portable.
The rate of fire isn’t that great, so the bubbles appear to simply get larger the longer you talk. Essentially, the device increases the size of the iris — the part that blows the bubble — until you pause speaking. Then it burps out a bubble.
Continue reading “Talking With Bubbles”
This is an older project, but the electromechanical solution used to create this giant, staring eyeball is worth a peek. [Richard] and [Anton] needed a big, unblinking eyeball that could look in any direction and their solution even provides an adjustable pupil and iris size. Making the pupil dilate or contract on demand is a really nice feature, as well.
The huge fabric sphere is lit from the inside with a light bulb at the center, and the iris and pupil mechanism orbit the bulb like parts of an orrery. By keeping the bulb in the center and orbiting the blue gel (for the iris) and the opaque disk (for the pupil) around the bulb, the eye can appear to gaze in different directions. By adjusting the distance of the disks from the bulb, the size of the iris and pupil can be changed.
A camera system picks out objects (like people) and directs the eye to gaze at them. The system is clever, but the implementation is not perfect. As you can see in the short video embedded below, detection of a person walking by lags badly. Also, there are oscillations present in the motion of the iris and pupil. Still, as a mechanism it’s a beauty.
Continue reading “Behold The Giant Eye’s Orrery-Like Iris And Pupil Mechanism”
What’s cooler than a door that irises open and closed? Not much. They add a nice science-fictiony detail to any entryway. [Zposner]’s dad wanted an automatic door for his chicken coop, so [zposner] took some time and came up with a nice door for him with an iris mechanism. You’ll need to watch the video.
[Zposner] used a combination of laser cutting and a CNC router to cut the pieces, then sanded and painted the wood. After assembly, [zposner] started work on the control mechanism. He’s controlling the door with an Arduino and a motor shield; to let the Arduino know to stop the motor, [zposner] used limit switches which get hit as the mechanism rotates. Once the switches were in the right place and the code written, it was time to finish assembly and install the door on the coop. To keep the Arduino that safe, it was installed in a plastic container with a screw lid, and then hot-glued to beside the iris.
Unfortunately, chickens don’t necessarily care how cool something is, and in this case, they didn’t realize that the iris was a door – they refused to exit the coop through it. [Zposner] tried a few things before settling on putting the chicken on the edge of the door – then the chicken would realize that it could go through it.
[Zposner]’s dad now has a snazzy door that opens with a switch. It was a great project for [zposner] and his dad to work on and, even if the chickens seem unimpressed, they did a great job. Check out the iris porthole that a Detroit Hackerspace built into its door, or, if you really want to build an iris mechanism, but don’t have access to a CNC router, a laser cutter, or, you know, wood, you could build this out of bits you have lying around.
Continue reading “Irising Chicken Coop Door”
In order to resolve the problem of congestion at the entrance to their hackerspace, the minds at i3Detroit installed a motion-activated mechanical iris in their door’s porthole.
Grabbing the design online (which they are now hosting on their site here), the parts were laser cut out of wood, gold leaf was added for effect, and it was relatively easy to assemble. PIR sensors detect movement on both sides of the door and an FET resistor connected to an orange LED add some old-school science fiction flair. The iris is actuated by a 12V car window motor — which works just fine on the 5V power that it’s supplied with — and an Arduino filling in as a controller. Start and stop positioning required some limit switches that seem to do the trick.
Continue reading “Door Iris Porthole Is The Perfect Fix For Detroit Hackerspace”
Mechanical irises are very intricately designed mechanisms that are mesmerizing to see in action — and if you have a laser cutter, you could make one in less than 10 minutes.
Our “Teacher of Science”, Instructables’ user [NTT] has revised a previous Instructables design on a mechanical iris to improve it. The original design used three layers of components and dowel pins for every joint. What [NTT] has done is reduced this to two layers, and eliminated half of the pins required by designing clever circular cutouts. The result is a very slick mechanical iris that is very easy and quick to build — provided you have the tools.
Stick around to see the original iris open and close — unfortunately there’s no video of the new design — but we think you can imagine the differences.
Continue reading “Mechanical Iris Will Make You Want A Laser Cutter Even More”
The Eugene Maker Space’s entry in the Red Bull Creation contest dispenses cans in a mysterious fog through an iris opening. But it’s also capable of disposing of the Red Bull cans… and only those cans. If you try to put a different soda in it will violently reject it!
First off we must applaud the Eugene Makers for their prolific documentation of the project. There’s a day or two worth of fun reading/watching on that page so make sure you save the bookmark (and learn from their example!). Inside the mysterious waist-high enclosure there’s a hopper to store the energy-drink reservoir. As a can is dispensed its barcode is scanned to ensure this is an approved beverage. At this point the can is elevated through an iris in the case of the enclosure, al0ng with a theatrically timed puff of fog. The parts of the iris were printed on paper and used to cut out wooden pieces using a scroll saw. The fog blast is from an inverted duster can with a 3d printed nozzle that helps make it Bullduino controlled.
When done with your beverage the can can be placed back in the opening, where it is again scanned before going into the recycling bin. But as you can see in the clip after the break, trying to sneak a soda can into the machine will launch the empty right back at you!
Continue reading “Red Bull Dispenser Includes Smokey Presentation And Rejects Inferior Drinks”