Jenkins Lights the Christmas Tree

Jenkins is open-source automation software that tries to automate parts of the software development process. When you submit code, for example, Jenkins will grab it, build the project with it and run any tests on it. If you have a large number of people submitting new code or data, Jenkins will wait and grab a bunch of the submissions to build. Depending on the size of the project, this can take a while, and if there’s a problem, you need to know quickly so that people aren’t waiting on a broken build. Email’s fine for this, but [dkt01] saw one of the desktop LED Christmas tree projects on Hackaday, and integrated it into his Jenkins system.

Like the other projects, WS2812b LED rings are used as the tree, and an Arduino Pro Mini runs the show, with an Ethernet LAN Module to communicate with the Python script that monitors the Jenkins build job. The Python script sends commands to the Arduino, which in turn lights up the LEDs. They light up green on a successful build and red if something fails, but during the build process, the LEDs show the current state of the build, tracking Jenkins’ progress as it builds.

Our previous Jenkins post used a big, red LED light that would light up if the build failed. [dkt01]’s build lets you know if the build is successful or has failed, but the build progress is a great addition.

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Bluetooth Speaker With Neopixel Visual Display!

Finding a product that is everything you want isn’t always possible. Making your own that checks off all those boxes can be. [Peter Clough] took the latter route and built a small Bluetooth speaker with an LED visualization display that he calls Magic Box.

A beefy 20W, 4Ohm speaker was screwed to the lid of a wooden box converted to the purpose. [Clough] cut a clear plastic sheet to the dimensions of the box, notching it 2cm from the edge to glue what would become the sound reactive neopixel strip into place — made possible by an electret microphone amplifier. There ended up being plenty of room inside the speaker box to cram an Arduino Pro Mini 3.3V, the RN-52 Bluetooth receiver, and the rest of the components, with an aux cable running out the base of the speaker. As a neat touch, neodymium magnets hold the lid closed.

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7 Segment Display Using Neopixel Rings

There’s something about clocks — sooner or later, every hacker wants to build one. And we end up seeing all kinds of display techniques being used to show time. For the simplest of builds, 7-segment display modules usually get dug up from the parts bin. If you have a bunch of “smart” LED’s (WS2812’s, APA102’s), then building your own custom 7-segment modules isn’t too difficult either. [rhoalt] had neither, but he did have several 8 LED Neopixel rings lying around. So he thought of experimenting with those, and built a ‘Binoctular’ LED clock which uses the Neopixel rings as 7 segment displays.

figure-eight-segment-displaysEach digit is made using one pair of Neopixel rings, stacked to form a figure of eight. All the digits are composed of arcs, so readability isn’t the best but it’s not hard either. [rhoalt] does mention that the display is easier to read via blurred camera images rather than visually, which isn’t surprising. We’re long used to seeing numbers composed of straight line segments, so arc segmented digits do look weird. But we wouldn’t have known this if [rhoalt] hadn’t shown us, right ? Maybe a thicker diffuser with separator baffles may improve the readability.

The rest of the build is pretty plain vanilla — an Arduino Nano clone, a DS3231 RTC, a Lithium battery, and some buttons, all housed together in a laser cut enclosure which follows the figure of eight design brief. And as usual, once you’ve built one, it’s time to improve and make a better version.

Building The Brightest Light Sabre In The World

If you are looking for a Star Wars light sabre, sometimes your choices can be a little disappointing. “Replica” sabres from toy and novelty vendors may superficially look the part, but with their tinny speakers and lacklustre show of LEDs they often have less of the Force about them and more of the Farce.

[Jeremy Lee] offers a solution; he’s built what he claims to be the brightest light sabre in the world. That’s a bold assertion, and one which we think might even throw down a gauntlet to other sabre builders and spark an arms race among Jedi wannabes.

The super-bright sabre uses a 144 LED double-sided strip of Neopixels in a polycarbonate tube, with a DC to DC converter powered by a 1000mAH LiPo battery. Sound effects come from a SparkFun Pro Micro powering a 2W speaker through a small audio amplifier. The handle meanwhile is constructed from PVC pipe fittings.

His first attempt at the sabre had the LEDs at full power, and promptly melted his tube. Thus the final version runs at 40% of its maximum rating, with a “burst” mode for those moments at which combat demands it.

His write-up is a series of posts, with plenty of video at all points. It might seem odd to show you the shortest of them here at only a few seconds long, but since the unique selling point is its brightness we think the best way to show that is at night.

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Who Could Resist a Color Coded Clock?

[Luc] wanted to make a clock like no other. He knows that the territory is well-trod, especially in the area of minimalist design. Undeterred, [Luc] came up with a fresh design that uses the resistor color code to display the time. He’s calling it the Nerd’s Ultimate Watch.

It doesn’t get much more minimalist than four RGB LEDs. Each one illuminates in the color that represents the digit in the current time. For instance, I’m typing this sentence at 1:37PM. The clock uses 24-hour time, so let’s call it 13:37. Using resistor color code time, that’s 1, 3, 3, 7, or brown, orange, orange, violet.
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Realize the Truth… There Is No Word Clock

Do you always look at it encoded? – Well you have to. The image translators work for the construct program.

Word clocks are supposed to de-encode time into a more readable format. Luckily [Xose Pérez] managed to recover the encoded time signal of the simulation we are all living in with his word clock that displays time using a stylish Matrix code animation.

[Xose] already built his own versions of [Philippe Chrétien’s] Fibonacci Clock and [Jeremy Williams’s] Game Frame, and while doing so he designed a nice little PCB. It’s powered by an ATmega328p, features an RTC with backup battery, an SD-card socket, and it’s ready to drive a bunch of WS2812Bs aka NeoPixels. Since he still had a few spare copies of his design in stock, his new word clock is also driven by this board.

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Wake Up With A NeoPixel Sunrise Alarm Clock

Like many of us, [Lee] wakes up every morning grumpy and tired. Once he decided to try to do something about it, he settled on making a sunrise alarm clock using NeoPixels. Over the course of thirty minutes the clock illuminates 60 NeoPixels one by one in blue mode to simulate a sunrise.

The clock has three modes: 30-minute sunrise, analog time display, and a seconds counter that uses the full RGB range of the LEDs to light up one for each passing second. It runs on an Arduino Pro Mini knockoff and an RTC module for the sake of simplicity. [Lee] chained NeoPixel strips together in five rows of eight, which allowed him to use a 3×5 font to display the time. The only other electronics are passives to protect the LEDs.

NeoPixels are great, but powering them becomes an issue pretty quickly. [Lee] did the math and figured that he would need 3.4 A to drive everything. He found a 3-outlet USB power adapter that delivers 3.4 A total while shopping at IKEA for an enclosure. [Lee] took his first Instructable from beginner to intermediate level by cracking the adapter open and using two of the USB ports wired in parallel to provide 5 V at 3.4 A. [Lee] has the code available along with detailed instructions for replicating this build. Be sure to check out the demo after the break.

We love a good clock build around here, especially when they involve Blinkenlights. For those less interested in building an alarm clock, here’s a word clock that pulls time and weather data with an ESP8266.

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