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authorjaseg <git@jaseg.de>2025-07-26 13:46:13 +0200
committerjaseg <git@jaseg.de>2025-07-26 13:46:13 +0200
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+<!DOCTYPE html>
+<html><head>
+ <meta charset="utf-8">
+ <title>Blog | Home</title>
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+ <a href="https://git.jaseg.de/" title="cgit">cgit</a>
+ <a href="https://github.com/jaseg" title="Github">Github</a>
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+ <a href="https://chaos.social/@jaseg" title="Mastodon">Mastodon</a>
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+
+ <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&#39;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 PS/2 keyboards.</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>
+
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generated by cgit (git 2.34.1) at 2025-07-27 21:06:44 +0000