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today's leftovers

Submitted by Roy Schestowitz on Sunday 10th of July 2022 07:55:01 PM Filed under
Misc

  • Dial up your PCB design skills with an LED volume control shield | Arduino Blog

    The beauty of Arduino development boards is that they let you jump right into prototyping. Just connect the sensors, buttons, LEDs, or whatever other hardware you require to the Arduino’s I/O pins, code and flash a sketch, and you’re in business. But you might come to a stage where you want something more polished than a breadboard or perfboard. When you reach that stage, you can follow along with YouTuber Upir’s LED volume knob project to learn how to design your first PCB.

    Upir chose to use an Arduino Leonardo board for this project because its ATmega32U4 microcontroller’s built-in USB HID functionality. That means that it can be configured to show up as a USB mouse or keyboard when plugged into any computer, regardless of the operating system or software that computer runs. In this case, that makes it easy to send keyboard shortcuts that adjust the computer’s volume.

  • 'Significant Improvements' Made to Ubuntu Firefox Snap - OMG! Ubuntu!

    Canonical has, over the years, often talked about how it has improved the startup time of Snap apps yet, for many of us, those improvements have been …theoretical at best.

    But in its latest ‘update’ on efforts being made to improve Firefox Snap performance the company may, at last, deliver a real-world speed boost to back those claims up.

    Startup time of the Firefox Snap is up to 50% faster on fresh installs than before.

    The first key improvement is courtesy of Mozilla developers who have tweaked the browser’s behaviour to only load one locale (aka language pack) on first start, based on system settings, rather than loading in all languages available.

  • IBM acquires Databand to bolster its data observability stack

    IBM today announced that it acquired Databand, a startup developing an observability platform for data and machine learning pipelines. Details of the deal weren’t disclosed, but Tel Aviv-based Databand had raised $14.5 million prior to the acquisition.

  • My current mixed views on the Linux kernel netconsole

    The Linux kernel's netconsole allows you to "log kernel printk messages over UDP" to a remote system; this makes it another form of kernel (message) console, alongside the video console and serial console. I've looked into netconsole periodically and played with it a bit, and the whole experience has left me with decidedly mixed feelings and very little desire to actually use it in our environment.

    The first problem with netconsole in practice is that the story on the receiving side is what you could politely call lacking. The usual advice is to send netconsole messages to either a listening syslogd or to some manual command. No one seems to have built a usable, ready to go 'netconsole server' that would reliably capture netconsole messages, put them in per-host files or the like, and so on (Facebook's netconsd could be extended into this but it doesn't ship with a file logger).

    The second problem is that on the sending side, the usage case for netconsole is limited in our environment. If you want to capture normal kernel messages off the machine in normal circumstances, a remote syslog server generally works just as well. If you want to capture kernel messages in crazy situations, you're almost certainly better off with a serial console, including "serial over IPMI", because there are a lot fewer moving parts in the kernel for sending output over a serial link than there are for sending even relatively hard-coded UDP messages.

  • Brunch With Brent: Tim Canham | Jupiter Extras 87

    We explore topics including the hardware and software powering NASA’s Ingenuity Mars Helicopter; JPL's switch from Solaris to Linux; the open source projects, tools, and philosophy at JPL, ...and more.

»

More in Tux Machines

today's howtos

  • How to Change Comment Color in Vim – Fix Unreadable Blue Color

    Are you annoyed about the comment color in vim? The dark blue color of the comment is often hard to read. In this tutorial, we learn how to change the comment color in Vim. There are few methods we can use to look vim comment very readable.

  • How to Add Repository to Debian

    APT checks the health of all the packages, and dependencies of the package before installing it. APT fetches packages from one or more repositories. A repository (package source) is basically a network server. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application. The normal installation comes with default repositories configured, but these contain only a few packages out of an ocean of free software available. In this tutorial, we learn how to add the package repository to Debian.

  • Making a Video of a Single Window

    I recently wanted to send someone a video of a program doing some interesting things in a single X11 window. Recording the whole desktop is easy (some readers may remember my post on Aeschylus which does just that) but it will include irrelevant (and possibly unwanted) parts of the screen, leading to unnecessarily large files. I couldn't immediately find a tool which did what I wanted on OpenBSD [1] but through a combination of xwininfo, FFmpeg, and hk I was able to put together exactly what I needed in short order. Even better, I was able to easily post-process the video to shrink its file size, speed it up, and contort it to the dimension requirements of various platforms. Here's a video straight out of the little script I put together: [...]

  • Things You Can And Can’t Do

    And it got me thinking about what you can and can’t do — what you do and don’t have control over.

  • allow-new-zones in BIND 9.16 on CentOS 8 Stream under SELinux

    We run these training systems with SELinux enabled (I wouldn’t, but my colleague likes it :-), and that’s the reason I aborted the lab: I couldn’t tell students how to solve the cause other than by disabling SELinux entirely, but there wasn’t enough time for that.

  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

    The short answer to the question is a resounding no, and it all boils down to the fact that the IndieWeb is really complicated to implement, so it will only ever appeal to developers.

  • How to Install CUPS Print Server on Ubuntu 22.04

    If your business has multiple personal computers in the network which need to print, then we need a device called a print server. Print server act intermediate between PC and printers which accept print jobs from PC and send them to respective printers. CUPS is the primary mechanism in the Unix-like operating system for printing and print services. It can allow a computer to act as a Print server. In this tutorial, we learn how to set up CUPS print server on Ubuntu 22.04.

Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

Security Leftovers

How to Apply Accent Colour in Ubuntu Desktop

A step-by-step tutorial on how to apply accent colour in Ubuntu desktop (GNOME) with tips for Kubuntu and others. Read more

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