Author: Zoe Skyforest

3822 Articles

A Simple Auger Pet Feeder

January 17, 2020 by 15 Comments

Pet feeders are a popular maker project. One can speculate that this shows the great self-confidence common to the maker set, who are willing to trust their own work to keep their animal companions alive for many days at a a time. [Darren Tarbard] is one such maker, who put together this simple auger build.

The project consists of a hopper for dry pet food, into which a screw auger is inserted. Both parts are 3D printed, making them easy to produce at home for the average maker. The build was designed specifically around the parts [Darren] had to hand, namely a 28BYJ-48 stepper motor, which is charged with turning the auger. Running the show is an Arduino, which can be run with whatever suitable timing code is necessary to feed the particular pet in question. There’s also a remixed version that adds a larger food storage dish on top for longer periods of unattended operation, created by [szuchid].

It’s a basic build, but one that would be readily achievable by most makers with little more than some junkbox components and a roll of filament. Of course, if your pet prefers wet food, you might need a different design. Video after the break.

Continue reading “A Simple Auger Pet Feeder” →

Magic Acrylic Makes This Ring Stand Out

January 17, 2020 by 9 Comments

LEDs look great no matter how you use them, but sometimes you want to hide them from direct view. [Charlyn] found a great way to do that, using a special material designed just for the purpose.

[Charlyn] built a ring as a piece of fashion jewelry, hooking up a Gemma M0 microcontroller to a Neopixel Jewel, which packs 7 individual LEDs. The hardware is secreted away inside an enclosure featuring both 3D-printed and lasercut parts.

Rather than openly show off the electronics, it’s all hidden away inside. Instead, a piece of black Chemcast LED acrylic is used, which allows LED light to shine through, while otherwise appearing opaque. Those interested in learning more can check out the product details on the manufacturer site.

It’s a great way to make a subtle costume piece that only reveals its flashier side when you so decide. We’ve seen badges use similar techniques on PCBs to great effect, too. Video after the break.

Continue reading “Magic Acrylic Makes This Ring Stand Out” →

74-Series Clock Gets A MEMS Heart

January 16, 2020 by 15 Comments

[Erik van Zijst] has had a long career as a programmer, but lacked an understanding of what was happening at a bare metal level. After building a few logic gates out of transistors to get a feel for electronics, he set out to build a working clock using 74-series logic. Naturally, it was quite the adventure. 

The project starts out as many do on the breadboard. The requisite BCD counters and 7-segment displays were sourced, and everything was connected up with a cavalcade of colorful hookup wires. A 32.768 KHz crystal was pressed into service to generate the clock signal, divided down to get a 1Hz output to drive the seconds counter that would then run the entire clock. [Erik] then had to learn some more practical electronics skills, to deal with debouncing buttons for the time setting circuit.

With the clock now functional, [Erik] decided to take things further, aiming to build something more robust and usable. An automatic brightness control was created using a 555 to run a crude PWM dimmer for the LEDs. Additionally, a PCB was designed to replace the temporary breadboard setup. This led to problems with the oscillator that [Erik] couldn’t quite figure out. Rather than continue on the same path, he changed tack, instead replacing the quartz crystal with a modern MEMS oscillator that solved the problem.

It’s a great look at how to construct a working clock from bare logic, and one that serves to remind us just how complex even a seemingly simple device can be. We’ve seen other from-scratch builds before too, like this 777-transistor clock, or this attractive stacked design. Video after the break.

Continue reading “74-Series Clock Gets A MEMS Heart” →

Motorized Inline Skates Run On Makita Power

January 16, 2020 by 11 Comments

Inline skates can be fun, but like most wheeled contraptions, they’re even better when motorized. With just such a goal in mind, [The Real Life Guys] decided to whip up a set of powered skates, running on Makita power!

To get power to the ground, the third wheel on each skate is modified to have a sprocket attached. A Makita drill is then fitted to the skate, transferring power to the wheel through a 90-degree gearbox and a chain drive. The drill is controlled by removing the trigger from the shell and hooking it up with an extended cable.

It’s a lairy setup that probably takes serious practice to use effectively, but does allow for fancy tricks like differential steering if you really want to show off. It’s a great example of using a powerdrill as an all-inclusive motion setup, with the battery, motor and drivetrain already integrated in a neat, tidy package. It’s not the first time we’ve seen a powered set of ‘skates, either! Video after the break.

Continue reading “Motorized Inline Skates Run On Makita Power” →

Better Controls For Your Chromecast Through CEC

January 14, 2020 by 34 Comments

Modern home cinema equipment is well-equipped with features for interoperability and convenience, but in practice, competing standards and arcana can make it fall over. Sometimes, you’ve gotta do a little work on your own to glue it all together, and that’s what led [Victor] to develop a little utility of his own.

ChromecastControls is a tool that makes controlling your home cinema easier by improving Chromecast’s integration with the CEC features of HDMI. CEC, or Consumer Electronics Control, is a bidirectional serial bus that is integrated as a part of the HDMI standard. It’s designed to help TVs, audio systems, and other AV hardware to communicate, and allow the user to control an entire home cinema setup with a single remote. Common use cases are TVs that send shutdown commands to attached soundbars when switched off, or Blu-Ray players that switch the TV on to the correct output when the play button is pressed.

[Victor]’s tool allows Chromecast to pass volume commands to surround sound processors, something that normally requires the user to manually adjust their settings with a separate remote. It also sends shutdown commands to the attached TV when Chromecast goes into its idle state, saving energy. It relies on the PyChromecast library to intercept traffic on the network, and thus send the appropriate commands to other hardware. Simply running the code on a Raspberry Pi that’s hooked up to any HDMI port on a relevant device should enable the CEC commands to get through.

It’s a project that you might find handy, particularly if you’re sick of leaving your television on 24 hours a day because Chromecast never bothered to implement a simple CEC command on an idle timeout. CEC hacks have a long history, too – we’ve been covering them as far back as 2010!

CircuitPython Now Working On Teensy 4.0

January 14, 2020 by 33 Comments

Python is often touted as a great language for beginner coders to learn. Until recently, however, it simply wasn’t a viable choice in the embedded space. That’s begun to change with projects like CircuitPython, and now it’s available on the Teensy 4.0!

This milestone is thanks in part to [arturo182], who did the ground work of getting CircuitPython to run on the iMX RT series of microcontrollers. This was built upon by [tannewt], who is the lead in charge of the CircuitPython project.

There are some bugs to work out; currently, the project is in a very early stage of development. [Paul Stoffregen], who heads Teensy development, has already pointed out that there needs to be allowance for the 4096 byte recovery partition in the Teensy 4.0’s storage, for example. Development continues at a rapid pace, and those with ideas about where the project should go can weigh in online.

It’s an exciting development, which brings easy Python development to one of the more powerful embedded development platforms on the market. We look forward to seeing many more projects take advantage of the power of the Teensy 4.0 moving forward. If you’re eager to see what can be done with CircuitPython, be sure to check out projects we’ve featured before. Video after the break.

Continue reading “CircuitPython Now Working On Teensy 4.0” →

Finally, A Real Set Of Gamecube Joycons

January 13, 2020 by 8 Comments

The Gamecube may not have sold as many units as its competitors in its day, but it maintains a cult fanbase to this day. Due largely to the Smash Bros. community, its controllers are still highly sought after. After the release of the Nintendo Switch, with plenty of fan renders around the place [Shank Mods] figured someone would create a set of Joycons with Gamecube controls. After waiting almost four years, he decided instead to do it himself.

The build begins with a Wavebird controller shell, chosen for its larger body, which is coincidentally the same height as the Switch. The shell was cut down the middle, and 3D printed components were created to attach Joycon mounting rails to the two halves of the controller. The large controller also has plenty of space inside, making it easy to fit all the Joycon components inside. Compatibility was a key aim of this build, so much attention was paid to make the Gamecube Joycons function properly with all Switch features. Extra buttons were added where necessary, and the formerly analog triggers were modified with plugs to match the solely digital operation of the Switch components.

It’s a project that had to overcome many hurdles, from mechanical redesigns to make everything fit, to figuring out the arcane electrical design of the Joycon hardware. The hard work paid off however, and [Shank Mods], along with a couple of talented community members, was able to create a beautiful piece of hardware. We’ve seen Gamecube-themed Joycons before, but this build really does take the cake. If you’ve instead modified the original Xbox controller to work with the Switch, be sure to let us know. Video after the break.

Continue reading “Finally, A Real Set Of Gamecube Joycons” →