The holy grail of computer languages is to write code once and have it deploy effortlessly everywhere. Java likes to take credit for the idea, but UCSD P-Code was way before that and you could argue that mainframes had I/O abstraction like Fortran unit numbers even earlier. More modern efforts include Qt, GTK, and other things. Naturally, all of these fall short in some way. Now Google enters the fray with Flutter.
Continue reading “Should You Build For Windows, Mac, IOS, Android, Or Linux? Yes!”
For most of us, a good part of our childhood involved running around someone’s backyard (or inside the house) trying to score hits with a toy NERF gun. The fun level was high and the risk of personal injury was low. Now that we’re all mostly adults, it’s probably time to take our NERF game to the next level with some risk of serious personal harm.
In an effort to help his brother get back at him for being somewhat of a bully in their youth, [Allen Pan] gifted him with an upgraded NERF gun. Specifically, one with darts that pack a punch. Each of the “Elite” darts was equipped with a 300 V capacitor packed into the interior of the dart. New tips were 3D printed with special metal tips that allow the capacitor to discharge upon impact.
Besides the danger, there’s a good bit of science involved. Parts were scavenged from a new (and surprisingly expensive) disposable camera, and a customized circuit was constructed around the barrel of the dart gun that allows the darts to charge up when they’re loaded. It’s an impressive build that would be relatively simple to reconstruct for yourself, but it’s probably not the worst thing we’ve seen done with high voltage and a few small capacitors.
Thanks to [Itay] for the tip!
Continue reading “You Should Not Try These Taser NERF Darts”
If you’re anything like us, you feel slightly guilty when you send a job to a printer only to find that twenty pages have printed wrong. Maybe it’s a typo, maybe it’s the dreaded landscape versus portrait issue. Whatever it is, trees died for your mistake, and there’s nothing you can do about it except to recycle the waste. But first, wipe that guilt away by using this one-stroke paper airplane maker to equip the whole office for an epic air battle.
We have to admit, automated paper handling has always fascinated us. The idea that a printer can reliably (sometimes) feed individual sheets of a stack is a testament to good design, and don’t even get us started about automatic paper folding. [Jerry de Vos]’ paper airplane maker doesn’t drive the sheets through the folder — that’s up to the user. But the laser-cut plywood jig does all the dirty work of creating a paper airplane. The sheet is clipped to an arm that pulls the paper through a series of ramps and slots that force the paper gently into the five folds needed for the classic paper dart. It’s fascinating to watch, and even though everyone seems to be using it very gingerly lest the paper tear, we can see how adding some rollers and motors from a scrapped printer could entirely automate the process. Think of the fun a ream of paper could provide around the office then.
Continue reading “Turn Failed Prints Into Office Fun With A Paper Airplane Maker”
When choosing weapons to defend yourself in the next zombie apocalypse, dart jamming whilst firing your Nerf Gun can be a deal-breaker. This clogging is an issue with many “semi-automatic” Nerf Guns. When our trigger-happy fingertips attempt to shoot a dart that hasn’t finished loading into the firing chamber, the halfway-loaded dart folds onto itself and jams the chamber from firing any more darts. The solution, as intended by Nerf, would be to open the chamber lid and manually clear the pathway. The solution, according to [Technician Gimmick], however, is active sensing, and the resulting “smart” dart gun is the TR-27 GRYPHON.
To prevent jamming from occurring altogether, [Technician Gimmick] added a trigger-disable until the dart has fully loaded into the firing chamber. An IR LED, harvested from a mouse scroll wheel, returns an analog value to the microcontroller’s analog-to-digital converter, allowing it to determine whether or not a dart is ready for firing. The implementation is simple, but the results are fantastic. No longer will any gun fire a dart until it has completely entered the chamber.
The TR-27 GRYPHON isn’t just a Nerf Gun that enables “smart” dart sensing. [Technician Gimmick] folded a number of other features into the Nerf Gun that makes it a charmer on the shelf. First, a hall-sensor array identifies the current cartridge loaded into the Nerf Gun and it’s carrying capacity. To display this value and decrement appropriately, [Technician Gimmick] added a dual-seven segment display, a trick we’ve seen before. Finally, a whopping 3S LiPo battery replaces the original alkaline batteries, and the voltage-reducing diodes have been cropped, enabling a full 12.6 Volt delivery to the motors at full charge.
We’re glad to see such a simple trick go such a long way as to almost entirely eliminate Nerf dart jams. For all those braving the Humans-Versus-Zombies frontier this season, may this clever trick keep you alive for just a bit longer.
Continue reading “Active “Dart-Sensing” Makes Your Nerf Gun Smarter”
[TopCityGear] was trying out a piece of PVC as a blow gun barrel when he thought he’d try to give it a little more power than what his lungs could put out. What he came up with is this air-powered Nerf gun that definitely leaves a mark. The video after the break is a show-and-tell, a build log, and finally a demonstration of its power. He adds a nail to a Nerf dart and drives it through a board, then leaves a huge welt on his poor friends chest with a plain old foam dart. It reminds us of those riot guns that shoot bean bags.
The air is stored in that twelve-inch PVC reservoir. On the rear cap there’s a Schrader valve for pressurizing the tank with a compressor or even a bike pump. The grip is a gutted cordless drill whose battery doubles as the power source for the electric sprinkler valve which fires the gun. The screw fitting just in front of the hand grip lets him remove the barrel so that the projectile can be inserted.
This reminds us of that gun which shoots water-filled ping-pong balls.
Continue reading “How To Build An Extremely Powerful Nerf Gun”
Here’s an image of a bullet’s path to the target. There’s a couple of things to note. First of all, this is not a tracer round, the projectile actually has an LED incorporated which was picked up as a trail in the long (relative to bullet speed) exposure. The second – and most obvious – thing to consider is the non-liner path it took to its objective. That’s because this is a laser guided bullet.
The smart bullet is a about four inches long and carries with it a light sensor, 8-bit processor, and some electromagnetic actuators. The tip is searching for a laser-painted target, with an algorithm calculating course corrections along the way and using the actuators to move fins which alter its path. For us the most interesting part is that this ammo requires a non-rifled barrel. The rifling spins the bullet as it leaves the firearm, which usually results in a straighter and more dependable path. But the microcontroller wouldn’t be able reliably steer if it were spinning.
We’d bet this ends up as a special sniper tool in video games before we hear about it on the battlefield. Check out a clip of the dart-like bullet leaving the muzzle in the clip after the break.
Continue reading “Last Century’s Guided Missile Steps Aside For This Guided Bullet”
[Vik Olliver] adds a bit more power to what has traditionally been a store-bought toy by designing this printable dart gun. His design prints the follower in the track where it belongs, which means it’s not going to come loose unless the material itself fails. After printing you’ll need to clean up that track just a bit, and ream out the pivot holes for the trigger parts. Two pieces of filament are used as the axles for pivot points and can be melted in place after assembly. A third length of filament acts as a spring, making this a completely plastic gun. Well, not completely; a couple of strong rubber bands deliver the stored energy which sends the Nerf dart on its way. The design is parametric so you can adjust it for the dart dimensions of your choosing before printing begins.
If you still haven’t managed to boot-strap your own 3D printer don’t fret. You can always give this Nerf dart sniper rifle a try.