Helix Display Brings Snake Into Three Dimensions

Any time anyone finds a cool way to display in 3D — is there an uncool way? — we’re on board. Instructables user [Gelstronic]’s method involves an array of spinning props to play the game Snake in 3D.

The helix display consists of twelve props, precisely spaced and angled using 3D-printed parts, each with twelve individually addressable LEDs. Four control groups of 36 LEDs are controlled by the P8XBlade2 propeller microcontroller, and the resultant 17280 voxels per rotation are plenty to produce an identifiable image.

In order to power the LEDs, [Gelstronic] used wireless charging coils normally used for cell phones, transferring 10 W of power to the helix array.  A brushless motor keeps things spinning, while an Arduino controls speed and position via an encoder. All the links to the code used are found on the project page, but we have the video of the display in action is after the break.

Continue reading “Helix Display Brings Snake Into Three Dimensions”

MIDI Guitar Pedals

Ever since Jimi Hendrix brought guitar distortion to the forefront of rock and roll, pedals to control the distortion have been a standard piece of equipment for almost every guitarist. Now, there are individual analog pedals for each effect or even digital pedals that have banks of effects programmed in. Distortion is just one of many effects, and if you’ve built your own set of pedals for each of these, you might end up with something like [Brian]: a modular guitar pedal rack.

ae0fmjxTaking inspiration from modular synthesizers, [Brian] built a rack out of wood to house the pedal modules. The rack uses 16U rack rails as a standard, with 3U Eurorack brackets. It looks like there’s space for 16 custom-built effects pedals to fit into the rack, and [Brian] can switch them out at will with a foot switch. Everything is tied together with MIDI and is programmed in Helix. The end result looks very polished, and helped [Brian] eliminate his rat’s nest of cables that was lying around before he built his effects rack.

MIDI is an extremely useful protocol for musicians and, despite being around since the ’80s, doesn’t show any signs of slowing down. If you want to get into it yourself, there are all kinds of ways that you can explore the studio space, even if you play an instrument that doesn’t typically use MIDI.

Helix Turning Tool Born From Necessity

helix turning tool

Sometimes while working on a project there comes a point where a specialized tool is needed. That necessary tool may or may not even exist. While [Fabien] was working on his DNA Lamp project he needed to bend a copper wire into a helical shape. Every one of us has wrapped a wire around a pencil and made a little springy thing at some point. While the diameter may have been constant, the turn spacing certainly was not. [Fabien] came up with a simple gizmo to solve that problem.

The tool utilizes an 8mm rod that will ensure the ID of the helix is indeed 8mm. We’ve already discussed that was the easy part. To make certain the turn spacing is not only consistent but also of the correct amount, a wooden frame is used. The frame has holes in it to allow the 8mm rod to pass through. Adjacent to those rod holes are much smaller holes just a bit larger than the copper wire that will become the helix. These holes are drilled at an angle to produce the correct turn spacing. [Fabien] figured out the correct angle by taking the desired turn spacing distance, helix diameter and wire diameter and plopping it in this formula:

Continue reading “Helix Turning Tool Born From Necessity”

Spark-Up Your Halloween Party with this Double Helix Jacob’s Ladder

Double Helix Jacobs Ladder

Dr. Frankenstein’s laboratory wouldn’t be complete without some electrical sparks. So for [Rick’s] final Halloween DIY hack this year he gives us just that, but with a twist. This time it’s a double helix Jacob’s ladder. The sparks are flying as they twist and turn their way up this unique design, powered by a standard neon sign transformer. If you can get your hands on a 15,000 V 30 mA transformer, you might have just enough time to build one for Halloween.

The build is quite simple. Other than the transformer, you will need a few feet of ¼ inch flexible copper tubing and a piece of ¾ inch PVC pipe. After twisting the copper tubing around the PVC pipe to form the double helix, [Rick] mounts the tubing to a block of wood and removes the PVC form. In his video, which you can watch after the break, [Rick] demonstrates a standard Jacob’s ladder, as well as his double helix design. The double helix version has a much nicer and slower traveling arc even stopping at times.

You don’t want to set this up anyplace someone might touch it as it can be quite deadly or cause burns. [Rick] mentions not to use wood to mount your ladder because the wood will burn as it did during his testing. And do not operate unattended. Otherwise, it adds some spark to your great Halloween fun.

Continue reading “Spark-Up Your Halloween Party with this Double Helix Jacob’s Ladder”

Playing MP3s from an FPGA

Building an audio player is a fun project. It used to be quite a task to do so, but these days the MP3 decoder chips are full-featured which means that if you know how to talk to other chips with a microcontroller you’ve got all the skills needed to pull off the project. But that must have been too easy for [Ultra-Embedded], he decided just to build an MP3 player out of an FPGA.

It’s not quite as difficult as it first sounds. He didn’t have to figure out how to decode the audio compressions. Instead he rolled the Helix MP3 decoder library into the project. It had already been optimized to run on an ARM processor, and since he’s using a RISC soft processor the translation wasn’t tough at all. He’s using a 24-bit stereo DAC chip to bridge the gap between the audio jack and the FPGA output. Clocking that chip with the FPGA isn’t ideal and causes 44.1 kHz audio to run 3% too slow. He says it’s not noticeable, which we believe. But if you try to play along with a song the pitch shift might end up driving you crazy.

If you’d prefer to just stick to the microcontroller based players this one’s small and inexpensive.

How to grow your own EL wire DNA helix lamp


[LucidMovement] was looking for some crystal-based artwork and just couldn’t seem to find anything that fit the bill, so he decided to build something himself.

The inspiration for his desk lamp came from something we’re all familiar with, a DNA double-helix. To grow the crystals he built a helix-shaped growing substrate out of nichrome and EL wires, submerging them in a warm alum solution. Once he had a nice set of crystals, he mounted it in an acrylic tube, filling the air space with clear silicone to seal off the display. He then mounted the silicone-filled tube on top of a rotating acrylic stand that he had cut for the project. The stand is made from several sheets of acrylic and contains both the gearing for movement as well as RGB LEDs to light the display from the bottom.

The lamp looks great when sitting idle, but when he powers it on it really shines (no pun intended). [LucidMovement] put a ton of work into the lamp, and offers up all sorts of tips, tricks, and considerations for anyone looking to build their own. Be sure to check out his writeup for plenty more details, and stick around to see a short video of the lamp in action.

Continue reading “How to grow your own EL wire DNA helix lamp”

Helix V2.0 released

Helix 2.0 has been released.  Helix is a collection of various tools for electronic forensics.  Just like on TV, you can use this to find all kinds of information on a computer.  Some of the useful tools added were Winlockpwn a tool for breaking windows security, Volitility which processes data out of the raw memory, and several other tools that are beyond our comprehension.

You’ve undoubtedly noticed that the title says Helix V2.0, but the image and header of the Helix site say 3.  We have no idea why. Look at the download info to see that it says V2.0.

[Via Midnight Research labs]