All-LEGO Centrifugal Pump

September 6, 2017 by John Baichtal 30 Comments

[Yoshihito Isogawa] almost never employs non-LEGO parts in his creations. He created an excellent centrifugal pump out of 100% LEGO. While mostly a curiosity, you can definitely get a sense of how the mechanics work.

A Power Functions motor turns a 6×6 round plate that appears to have 1×2 smooth plates jammed between the studs, and secured with a 4×4 round plate on the other end. He geared up the motor so the assembly is spun very quickly, with those smooth plates forcing the water through a Technic mounting hole in one of the bricks.

[Yoshihito] is known for his utterly elegant, stripped down mechanical assemblies—-check out his books if this is your bag. According to his bio he’s twice won the Japanese medal for best manual, so I guess he’s really good at explaining things! Also, that’s a thing?

For more DIY pump creation check out the air pump made out of a PVC pipe and the DIY syringe pump we published previously.

Nerf Gun Ammo Counter And Range Finder

September 2, 2017 by Rich Hawkes 18 Comments

The proliferation of breakout boards that the DIY electronics movement has allowed has been staggering. Buy a few different boards, wire them together to a microcontroller or credit-card computer (both on their own breakout board) and write a bit of code, and you can create some really interesting things. Take Reddit user [Lord_of_Bone]’s Nerf Gun ammo counter and range finder, for example, a great example of having a great idea and looking around for the ways to implement it.

For the range finder, [Lord_of_Bone] looked to an ultrasonic rangefinder. For the ammo counter, [Lord_of_Bone] chose a proximity sensor. To run everything, the Raspberry Pi Zero was used and the visuals were supplied by a Rainbow Hat. The range finder is self-explanatory. The proximity sensor is located at the end of the gun’s muzzle and when it detects a Nerf dart passing by it reduces the ammo count by one. Blu-tack is used to hold everything in place, but [Lord_of_Bone] plans to use Sugru when he’s past the prototype stage.

The one problem [Lord_of_Bone] has with the build is that there’s no way to tell how many Nerf bullets are in the magazine. Currently the wielder must push a button when reloading to reset the count to a preset amount. We’re sure that [Lord_of_Bone] would appreciate any suggestions the Hack-A-Day crowd could offer.

[Lord_of_Bone] gives a full bill of materials, Python code, a lot of pictures and step-by-step instructions so that you, too, can determine how far away your target is, and whether or not you have enough ammo to hit them. We have quite a few Nerf mods on the site, and [Lord_of_Bone] could take a look at this article about how to keep track of your Nerf ammo, and here’s a different method of determining if a Nerf dart has been fired (and measuring its speed.)

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Toy Dash Turned Gaming Interface

August 30, 2017 by John Baichtal 15 Comments

We see a lot of MAME cabinets and other gaming emulator projects here on Hackaday, but it’s not often that we see one the form factor of which so elegantly matches the ROM. [circuitbeard] converted a Tomy Turnin Turbo toy dashboard into a mini arcade machine playing Outrun.

There are many fascinating details in [circuitbeard]’s writeup. His philsophy is to “keep it looking stock” so he went to great lengths to add functionality to various elements of the toy without changing its appearance. The gear shifter was turned into a 3-way momentary switch with high and low speeds at top and bottom, with rubber bands pulling the switch back the center (neutral) when he lets go of it. The original toy’s steering wheel mounts to a slide potentiometer. The dash has a working ignition switch that uses a PowerBlock to manage the safe startup and shutdown of the Pi. The dash also lights up the way you’d expect, and even displays accurate MPG and rev info.

For more MAME goodness here on Hackaday, see this broken tablet turned into a mini MAME cabinet or the portable MAME system of the future

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A Disc Shooter For When Rubber Bands Or Nerf Darts Aren’t Enough

August 25, 2017 by Jenny List 27 Comments

There are times in everybody’s life when they feel the need to shoot at things in a harmless manner. For those moments there are rubber bands and Nerf darts, but even then they feel like mere toys. If that is the point at which you find yourself, then maybe [Austin]’s home-made electric disc shooter can help.

Operation of the shooter is simple enough. A stack of 3D-printed plastic discs is loaded into a tubular magazine, from which individual disks are nudged by a motor-driven cam controlled by the trigger. Once the disc leaves the magazine it reaches a vacuum cleaner belt driven by a much more powerful motor, that accelerates the disc to ejection velocity.

The video below the break shows the gun’s construction, as well as a sequence involving the destruction of plenty of balloons, soda cans, and food items. The 3D-printed ammunition seems to us to be the weak link as in our experience it is inevitable that there is a high ammunition loss rate with these type of weapons, but maybe [Austin] has a line on some cheap filament. Either way, his disc gun looks like the kind of toy that could provide an entertaining diversion for many readers.

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Remote Controlled Nerf Bomb

August 24, 2017 by Jenny List 10 Comments

There was a third-party multiplayer upgrade pack for one of the Quake games back in the ’90s that included a whole slew of non-standard weapons. Among them one of the most memorable was a gravity well, that when thrown into the middle of a crowded room full of warring players would suck them into a vortex. Assuming its user had made it to safety in time, they would then be left the victor. The hyper-violent make-believe world of a first-person shooter is probably best left in a Pentium server from the ’90s, with few direct parallels in the real world. Maybe laser tag, or Nerf battles, are the closest you’ll get.

If you are a Nerf enthusiast, then you’ll appreciate [Giaco Whatever]’s CO2-powered remote-control Nerf bomb as an analogue of that Quake gravity well. It fires twelve darts at the press of a button on an infra-red remote control. The firing tubes sit in a nicely machined manifold connected via a solenoid valve to a little CO2 gas bottle. In the hectic world of a Nerf war it is slid out into the field of combat, its operator takes cover, and the other participants are showered in foam darts. There are probably kids who would sell their grandparents to own this device.

The build is detailed in the video below the break, along with a wonderfully tongue-in-cheek movie segment demonstrating it in action.

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PiCorder: Raspberry Pi Stands In For Stone Knives And Bearskins

August 18, 2017 by Al Williams 26 Comments

In a classic episode of Star Trek, Spock attempts to get data from a tricorder while stuck in the 1930s using what he described as “stone knives and bearskins.” In reality, he used vacuum tubes, several large coils, and a Jacob’s ladder. Too bad they weren’t in the year 2017. Then Spock could have done like [Directive0] and used a Raspberry Pi instead. You can see the result in the video below.

The build starts with a Diamond Select Toys model tricorder. The Raspberry Pi, a battery, a TFT screen, and a Pi Sense Hat make up the bulk of the build.

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Wooden Domino Laying Machine

August 12, 2017 by Steven Dufresne 17 Comments

[Matthias Wandel] has come up with another awesome machine, this time a machine that sets up neat rows of dominos. If you’ve followed [Matthias]’s work over the years then you’ll know that this is a wooden version of one he made out of LEGO® back in 2009.

In true [Matthias] fashion he uses just the one motor both for moving the machine along and for pushing the dominos in place. Not satisfied with that efficient use of parts, the rubber band belts that transfer rotation from the motor shaft to the wheels (bearings) double as the rubber surfaces for those wheels. One of many joys from watching [Matthias] work is seeing how he forms wood into shapes that most people would have trouble sculpting from clay. In this case he does this when he needs parts for reaching over his domino magazine to hold a guide rail in place, and of course the parts are well-rounded and clean-looking.

You might also ask, where did he get all the wooden blocks for dominos? He made them of course, all 300 or so.

Be sure to check out the video below of both the build, and of it in action.

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