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diff --git a/blog/index.html b/blog/index.html new file mode 100644 index 0000000..433141a --- /dev/null +++ b/blog/index.html @@ -0,0 +1,226 @@ +<!DOCTYPE html> +<html><head> + <meta charset="utf-8"> + <title>Blog | Home</title> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="mobile-web-app-capable" content="yes"> + <meta name="color-scheme" content="dark light"> + <link rel="stylesheet" href="/style.css"> +</head> +<body><nav> + <div class="internal"> + + <a href="/" title="Home">Home</a> + <a href="/blog/" title="Blog" class="active">Blog</a> + <a href="/projects/" title="Projects">Projects</a> + <a href="/about/" title="About">About</a> + </div> + <div class="search"> + <div id="search"></div> + </div> + <div class="external"> + <a href="https://git.jaseg.de/" title="cgit">cgit</a> + <a href="https://github.com/jaseg" title="Github">Github</a> + <a href="https://gitlab.com/neinseg" title="Gitlab">Gitlab</a> + <a href="https://chaos.social/@jaseg" title="Mastodon">Mastodon</a> + </span> +</nav> + + <header> + <h1>Blog</h1> +<ul class="breadcrumbs"> + <li><a href="/">jaseg.de</a></li><li><a href="/blog/">Blog</a></li> +</ul> + + </header> + <main class="cards"> + <div class="card"><h3><a href="/blog/jupyterlab-notebook-file-oneliner/">Getting the .ipynb Notebook File Location From a Running Jupyter Lab Notebook</a></h3><strong>2025-06-29</strong> + + <div class="summary"> + <div class="document"> + + +<p>If you need to get the path of the ipynb file in a running #Jupyter notebook, this one-liner will do the trick. It seems chatgpt is confused, and a bunch of other approaches on the web look fragile and/or unnecessarily complex to me.</p> +</div> + <a href="http://jaseg.de/blog/jupyterlab-notebook-file-oneliner/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/8seg/">8seg Technical Overview</a></h3><strong>2023-12-26</strong> + + <div class="summary"> + <div class="document"> + + +<p>8seg is a large-scale LED light art installation that displays text on a 1.5 meter high, 30 meter wide 8-segment display made from cheap LED tape.</p> +</div> + <a href="http://jaseg.de/blog/8seg/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/telekom-gpon-sfp/">Ubiquiti EdgeRouter on Deutsche Telekom GPON Fiber</a></h3><strong>2022-02-21</strong> + + <div class="summary"> + <div class="document"> + + +<p>Short tutorial on getting a Deutsche Telekom GPON internet connection running using a SFP ONU unit in an Ubiquiti EdgeRouter.</p> +</div> + <a href="http://jaseg.de/blog/telekom-gpon-sfp/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/ihsm-worlds-first-diy-hsm/">New Paper on Inertial Hardware Security Modules</a></h3><strong>2021-11-23</strong> + + <div class="summary"> + <div class="document"> + + +<p>Paper announcement: We have published a paper on how you can DIY a tamper-sensing hardware security module from any single-board computer using a moving tamper-sensing mesh made from cheap PCBs.</p> +</div> + <a href="http://jaseg.de/blog/ihsm-worlds-first-diy-hsm/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/kicad-mesh-plugin/">Kicad Mesh Plugin</a></h3><strong>2020-08-18</strong> + + <div class="summary"> + <div class="document"> + + +<p>I wrote a little KiCad plugin that you can use to create security meshes, heaters and other things where you need one or more traces cover the entire surface of a PCB. The plugin supports arbitrary PCB shapes, cutouts, and can route around existing footprints and traces on the PCB.</p> +</div> + <a href="http://jaseg.de/blog/kicad-mesh-plugin/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/private-contact-discovery/">Private Contact Discovery</a></h3><strong>2019-06-22</strong> + + <div class="summary"> + <div class="document"> + + +<p>I gave a short introduction into Private Contact Discovery protocols at our university workgroup.</p> +</div> + <a href="http://jaseg.de/blog/private-contact-discovery/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/hsm-basics/">Hardware Security Module Basics</a></h3><strong>2019-05-17</strong> + + <div class="summary"> + <div class="document"> + + +<p>I gave a short introduction into Hardware Security Modules at our university workgroup, including an overview on interesting research directions.</p> +</div> + <a href="http://jaseg.de/blog/hsm-basics/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/serial-protocols/">How to talk to your microcontroller over serial</a></h3><strong>2018-05-19</strong> + + <div class="summary"> + <div class="document"> + + +<p>Scroll to the end for the <a class="reference internal" href="#conclusion">TL;DR</a>.</p> +<p>In this article I will give an overview on the protocols spoken on serial ports, highlighting common pitfalls. I will +summarize some points on how to design a serial protocol that is simple to implement and works reliably even under error +conditions.</p> +<p>If you have done low-level microcontroller firmware you will regularly have had to stuff some data up a serial port to +another microcontroller or to a computer. In the age of USB, an old-school serial port is still the simplest and +quickest way to get communication to a control computer up and running. Integrating a ten thousand-line USB stack into +your firmware and writing the necessary low-level drivers on the host side might take days. Poking a few registers to +set up your UART to talk to an external hardware USB to serial converter is a matter of minutes.</p></div> + <a href="http://jaseg.de/blog/serial-protocols/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/thors-hammer/">Thor's Hammer</a></h3><strong>2018-05-03</strong> + + <div class="summary"> + <div class="document"> + + +<p>In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the +shitty rubber dome freebie you got with your pc... Here's the solution: Thor's Hammer, a simple typing cadence enhancer +for <a class="reference external" href="https://en.wikipedia.org/wiki/PS/2_port">PS/2</a> keyboards.</p> +<figure data-pagefind-ignore> + <video controls loop> + <source src="video/thors_hammer.mov" type="video/h264"> + <source src="video/thors_hammer.webm" type="video/webm"> + Your browser does not support the HTML5 video tag. + </video> + <figcaption>A demonstration of the completed project. + + <a href="video/thors_hammer.mov">h264 download</a> / + <a href="video/thors_hammer.webm">webm download</a> + </figcaption> +</figure><p>The connects to the keyboard's PS/2 clock line and briefly actuates a large solenoid on each key press. An interesting +fact about PS/2 is that the clock line is only active as long as either the host computer or the input device actually +want to send data. In case of a keyboard that's the case when a key is pressed or when the host changes the keyboard's +LED state, otherwise the clock line is silent. We ignore the LED activity for now as it's generally coupled to key +presses. By just triggering an NE555 configured as astable flipflop we can stretch each train of clock pulses to a +pulse a few tens of milliseconds long that is enough to actuate the solenoid.</p></div> + <a href="http://jaseg.de/blog/thors-hammer/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/multichannel-led-driver/">32-Channel LED tape driver</a></h3><strong>2018-05-02</strong> + + <div class="summary"> + <div class="document"> + + +<p>Together, a friend and I outfitted the small staircase at Berlin's Chaos Computer Club with nice, shiny RGB-WW LED tape for ambient lighting. For this installation, I made a 32-channel LED driver that achieves high dynamic range on all 32 channels using a cheap microcontroller by using Binary Code Modulation.</p> +</div> + <a href="http://jaseg.de/blog/multichannel-led-driver/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/wifi-led-driver/">Wifi Led Driver</a></h3><strong>2018-05-02</strong> + + <div class="summary"> + <div class="document"> + + +<p>After the multichannel LED driver was completed, I was just getting used to controlling LEDs at 14-bit resolution. I liked the board we designed in this project, but at 32 channels it was a bit large for most use cases. Sometimes I just want to pop a piece of LED tape or two somewhere, but I don't need a full 32 channels of control. I ended up thinking that a smaller version of the 32-channel driver that didn't require a separate control computer would be handy. So I sat down and designed a variant of the design with only 8 channels instead of 32 and an on-board ESP8266 module instead of the RS485 transceiver for WiFi connectivity.</p> +</div> + <a href="http://jaseg.de/blog/wifi-led-driver/">Read more</a> + </div> +</div> + + <div class="card"><h3><a href="/blog/led-characterization/">LED Characterization</a></h3><strong>2018-05-02</strong> + + <div class="summary"> + <div class="document"> + + +<p>Recently, I have been working on a small driver for ambient lighting using 12V LED strips like you can get inexpensively from China. I wanted to be able to just throw one of these somewhere, stick down some LED tape, hook it up to a small transformer and be able to control it through Wifi. When I was writing the firmware, I noticed that when fading between different colors, the colors look <em>all wrong</em>! This observation led me down a rabbit hole of color perception and LED peculiarities.</p> +</div> + <a href="http://jaseg.de/blog/led-characterization/">Read more</a> + </div> +</div> + + </main><footer> + Copyright © 2025 Jan Sebastian Götte + / <a href="/about/">About</a> + / <a href="/imprint/">Imprint</a> +</footer> +<script src="/pagefind/pagefind-ui.js"></script> + <script> + if(navigator.getEnvironmentIntegrity!==undefined)document.querySelector('body').innerHTML=`<h1>Your browser + contains Google DRM</h1>"Web Environment Integrity" is a Google euphemism for a DRM that is designed to + prevent ad-blocking, and which Google has forced into their browsers against widespread public opposition. + In support of an open web, this website does not function with this DRM. 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