Misc Hacks

4030 Articles

Awesome Animation Channel Is An Educational Rabbit Hole

September 27, 2019 by 3 Comments

Once [Shabab] clued us in to the brilliant animations of [Jared Owen], we pretty much lost an afternoon exploring this incredible YouTube channel. Self-taught Blender wizard [Jared] combines fantastic animations with clear and concise explanations for the inner workings of everything from Nerf guns and Fisher-Price corn poppers to the International Space Station.

Space nerds and casuals alike should check out [Jared]’s crowning achievement: a three-video Apollo spacecraft series, which covers many details in a short amount of time. Want more Apollo? Here’s a deeper dive into the lunar module. [Jared] uses music to great effect in these videos, especially in the Apollo series.

Several videos are devoted to mechanisms, like the humble gumball machine, the grand piano, and the combination lock. In addition to all the great how-it-works videos, [Jared] explores various noteworthy buildings. You know there’s a bowling alley in the White House, right? [Jared]’s tour shows you exactly where it is.

We love the diversity of the videos, all of which [Jared] researches in great detail. He enjoys working from user suggestions, so let him know what you’re dying to see dissected in detail.

Thanks for the tip, [Shabab].

3 Words To Describe Any Spot On Earth

September 26, 2019 by 118 Comments

For quite a long while now, latitude and longitude has been the way humankind has navigated the globe. This is a perfectly workable system, but it’s a little overwrought for daily use by the layperson. What3Words seeks to provide a simpler solution.

The system is based on splitting the surface of the globe into a grid of 3 m x 3 m sections. This includes oceans and bodies of water. With the grid layed out, each section is given a name consisting of three English words strung together. For example, ///eggs.form.breakfast denotes a spot in the outskirts of Chengdu, China, while ///crops.cards.gifts is a good approximation of that spot where the Naked Cowboy hangs out in Times Square, New York.

Addresses in this format are written with three leading forward slashes, along with a dot between each word. An attempt has been made to only use uncontroversial words, as well as to make sure no crude addresses are created by awkward combinations. Don’t worry, we checked – but if you do find anything good, drop it in the comments below.

It’s a tool that’s been around for a while, but an interesting one nonetheless. It’s something that needs a wider societal acceptance to become truly useful; we imagine it could be good in a small social circle once everyone is familiar with it. It may yet catch on – only time will tell!

Smart Map Puts On A Show Thanks To Arduinos And DMX

September 24, 2019 by 9 Comments

Maps can be a great way to get a message across when the data you’re dealing with affects people on a country’s population scale. [jwolin] works for a non-profit organization, and wanted a way to help people visualize the extent of their operations and the causes they deal with. To do that, he created a nifty smart map wall display.

The display consists of a world map cut out of MDF, and affixed to a brick wall. There’s also two 4K Samsung monitors included as part of the system. The top monitor displays headings to contextualise the data, while the bottom screen displays related full motion video. A series of DMX-controlled lights then shine on the world map in various configurations to highlight the area of interest.

The system requires delicate coordination to operate cleanly and smoothly. There are three Windows 10 computers in the system, one for each monitor and another for the world map. An AutoHotkey script runs on the first computer, which selects a random video, and then sends out a command over serial to an Arduino Nano. This Arduino nano then communicates with two others, which make sure the second screen and DMX lighting rig then play the correct matching sequences, in time with the main video. Special care is taken to ensure that transitions are as smooth as possible, with no gaps in between each sequence. The entire installation is simple to update just by uploading additional content to a Dropbox folder, a crucial touch to future proof the project.

It’s an eye-catching system that helps educate visitors as to the mission of the organisation. We’ve seen other innovative world-map displays, like this clock that highlights night and day around the world. Video after the break.

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Fitness Tracker Hacked Into Optical Density Meter

September 20, 2019 by 5 Comments

What do fitness trackers have to do with bacterial cultures in the lab? Absolutely nothing, unless and until someone turns a fitness band into a general-purpose optical densitometer for the lab.

This is one of those stories that shows that you never know from where inspiration is going to come. [Chinna Devarapu] learned that as a result of playing around with cheap fitness bands, specifically an ID107HR. A community has built up around hacking these bands; we featured a similar band that was turned into an EEG. With some help, [Chinna] was able to reflash the microcontroller and program it in the Arduino IDE, and began looking for a mission for the sensor-laden platform.

He settled on building a continuous optical densitometer for his biology colleagues. Bacterial cultures become increasingly turbid as the grow, and measuring the optical density (OD) of a culture is a common way to monitor its growth phase. This is usually done by sucking up a bit of the culture to measure, but [Chinna] and his team were able to use the hacked fitness band’s heartrate sensor to measure the OD on the fly. The tracker fits in a 3D-printed holder where an LED can shine through the growing culture; the sensor’s photodiode measures the amount of light getting through and the raw data is available via the tracker’s Bluetooth. The whole thing can be built for less than $20, and the plans have been completely open-sourced.

We really like the idea of turning these fitness bands into something completely different. With the capabilities these things pack into such a cheap and compact package, they should start turning up in more and more projects.

Stunning 4-Cylinder Solenoid Motor Should Be A Hit With Subaru Fans

September 18, 2019 by 47 Comments

As far as electric propulsion is concerned, the vast majority of applications make use of some kind of rotational motor. Be it induction, universal, brushed or brushless, these are the most efficient ways we have to do mechanical work with electricity. There are other, arcane methods, though – ones which [Maker B] explores with this 4-cylinder solenoid engine.

The principle of the solenoid engine is simple. Cylinders are wound with coils to act as solenoids, with the piston acting as the armature. When the solenoid is energised, it pulls the piston into the cylinder. The solenoid is then de-energised, and the piston can return to its initial position. The piston is coupled to a crankshaft via a connecting rod, and a flywheel is used to help the motor run continually. These are also known as reciprocating electric motors.

[Maker B]’s build is a 4-cylinder design in a boxer configuration. Produced with basic hand-operated machine tools, the build process is one to watch. Aluminium and brass are carefully crafted into the various components of the motor, and parts are delicately assembled with small fasteners and plenty of retaining compound. Solenoid timing is via a series of microswitches, installed neatly in the base of the motor and actuated by the crankshaft.

While solenoid motors are inefficient, they’re quite something to watch in action. This one is no exception, with the motor spinning up to 1100 rpm when running at 7.2 volts. We’d love to see some data on the power output and efficiency too. It’s possible to build solenoid motors in different configurations, too – this radial build is particularly fun. Video after the break.

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Arduino Bot Rocks A PS2 Controller

September 17, 2019 by 1 Comment

As far as controlling robots goes, makers today are spoilt for choice. WiFi and Bluetooth enabled microcontrollers are a dime a dozen, and integration with smartphone apps is a cinch. Despite this, the old methods still hold sway, as [Igor Fonseca] demonstrates with a simple Arduino bot.

It’s a classic build, using a tracked chassis with a pair of motors providing propulsion and skid steering. The motors are controlled by an L298N H-bridge board, with power courtesy of a trio of 18650 batteries. An Arduino Uno acts as the brains of the operation. Control is via a Playstation 2 controller, in this case a 2.4 GHz third party version. This allows the robot to be controlled wirelessly, with the decoding handled by [Bill Porter]’s useful Arduino library.

It’s a cheap approach to building a remote-controlled bot, and one that would be a great way to teach interested children about how to work with embedded systems. We’ve featured a similar build before, too. Video after the break.

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The Benefits And Pitfalls Of Using PCBs As An Enclosure

September 16, 2019 by 21 Comments

[Mastro Gippo] found himself in a pickle recently, with the development of an enclosure for the Prism electric vehicle charger. The body had been sorted out, but the front cover needed work. It had to be visually appealing, and ideally should provide the user feedback on the charging process. After some thought, [Mastro] decided to explore the possibilities of using a PCB as a part of a commerical product enclosure.

For a variety of reasons, using a specially designed PCB was an attractive solution for the team’s enclosure. Wanting something cost effective, easily customizable, and something that would help with emissions compliance, a PCB seemed like a great idea. With this in mind, [Mastro] prepared a series of prototypes. These feature see-through sections for LEDs to shine through, as well as a capacitive button and gold-plated logo. The fact that the front cover is a PCB makes the integration of the electronic components a cinch.

Before heading into full production, [Mastro] began to question why this technique isn’t used more often. Deciding to research further, [Bunnie Huang] was tapped to provide some advice on the concept. Noting that there can be issues with lead content, as well as the fact that PCBs aren’t often produced with proper regard to aesthetics, there were some pitfalls to the idea. Additionally, ESD testing can be difficult, while the in-built capacitive button would face issues in wet conditions.

None of these are showstoppers however, and [Mastro] has persevered, combining the front cover PCB with an adhesive plastic sheet for added protection. We fully expect that if more manufacturers explore this route, it may be a more viable technique in future. It’s also a great example of knowing when to ask others for help – it’s not the first time we’ve learned from [Bunnie’s] broad experience!