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<title>Blog on Home</title>
<link>http://jaseg.de/blog/</link>
<description>Recent content in Blog on Home</description>
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<copyright>Jan Sebastian Götte</copyright>
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<title>Code listings with nice line wrapping and line numbers from plain CSS</title>
<link>http://jaseg.de/blog/css-only-code-blocks/</link>
<pubDate>Wed, 23 Jul 2025 23:42:00 +0100</pubDate>
<guid>http://jaseg.de/blog/css-only-code-blocks/</guid>
<description><div class="document">


<p>Code listings in web pages are often a bit of a pain to use. Usually, they don't wrap on small screens. Also, copy-pasting code from a code listing often copies the line numbers along with the code. Finally, many implementations use heavyweight HTML and/or javascript, making them slow to render. For this blog, I wrote a little CSS hack that renders nice, wrapping code blocks with line continuation markers in plain CSS without any JS.</p>
</div></description>
</item>
<item>
<title>Getting the .ipynb Notebook File Location From a Running Jupyter Lab Notebook</title>
<link>http://jaseg.de/blog/jupyterlab-notebook-file-oneliner/</link>
<pubDate>Sun, 29 Jun 2025 23:42:00 +0100</pubDate>
<guid>http://jaseg.de/blog/jupyterlab-notebook-file-oneliner/</guid>
<description><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></description>
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<item>
<title>8seg Technical Overview</title>
<link>http://jaseg.de/blog/8seg/</link>
<pubDate>Tue, 26 Dec 2023 15:26:00 +0100</pubDate>
<guid>http://jaseg.de/blog/8seg/</guid>
<description><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></description>
</item>
<item>
<title>Ubiquiti EdgeRouter on Deutsche Telekom GPON Fiber</title>
<link>http://jaseg.de/blog/telekom-gpon-sfp/</link>
<pubDate>Mon, 21 Feb 2022 20:00:00 +0100</pubDate>
<guid>http://jaseg.de/blog/telekom-gpon-sfp/</guid>
<description><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></description>
</item>
<item>
<title>New Paper on Inertial Hardware Security Modules</title>
<link>http://jaseg.de/blog/ihsm-worlds-first-diy-hsm/</link>
<pubDate>Tue, 23 Nov 2021 23:42:20 +0100</pubDate>
<guid>http://jaseg.de/blog/ihsm-worlds-first-diy-hsm/</guid>
<description><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></description>
</item>
<item>
<title>Kicad Mesh Plugin</title>
<link>http://jaseg.de/blog/kicad-mesh-plugin/</link>
<pubDate>Tue, 18 Aug 2020 13:15:39 +0200</pubDate>
<guid>http://jaseg.de/blog/kicad-mesh-plugin/</guid>
<description><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></description>
</item>
<item>
<title>Private Contact Discovery</title>
<link>http://jaseg.de/blog/private-contact-discovery/</link>
<pubDate>Sat, 22 Jun 2019 10:30:00 +0800</pubDate>
<guid>http://jaseg.de/blog/private-contact-discovery/</guid>
<description><div class="document">


<p>I gave a short introduction into Private Contact Discovery protocols at our university workgroup.</p>
</div></description>
</item>
<item>
<title>Hardware Security Module Basics</title>
<link>http://jaseg.de/blog/hsm-basics/</link>
<pubDate>Fri, 17 May 2019 15:29:20 +0800</pubDate>
<guid>http://jaseg.de/blog/hsm-basics/</guid>
<description><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></description>
</item>
<item>
<title>How to talk to your microcontroller over serial</title>
<link>http://jaseg.de/blog/serial-protocols/</link>
<pubDate>Sat, 19 May 2018 08:09:46 +0200</pubDate>
<guid>http://jaseg.de/blog/serial-protocols/</guid>
<description><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></description>
</item>
<item>
<title>Thor's Hammer</title>
<link>http://jaseg.de/blog/thors-hammer/</link>
<pubDate>Thu, 03 May 2018 11:59:37 +0200</pubDate>
<guid>http://jaseg.de/blog/thors-hammer/</guid>
<description><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></description>
</item>
<item>
<title>32-Channel LED tape driver</title>
<link>http://jaseg.de/blog/multichannel-led-driver/</link>
<pubDate>Wed, 02 May 2018 11:31:14 +0200</pubDate>
<guid>http://jaseg.de/blog/multichannel-led-driver/</guid>
<description><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></description>
</item>
<item>
<title>Wifi Led Driver</title>
<link>http://jaseg.de/blog/wifi-led-driver/</link>
<pubDate>Wed, 02 May 2018 11:31:03 +0200</pubDate>
<guid>http://jaseg.de/blog/wifi-led-driver/</guid>
<description><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></description>
</item>
<item>
<title>LED Characterization</title>
<link>http://jaseg.de/blog/led-characterization/</link>
<pubDate>Wed, 02 May 2018 11:18:38 +0200</pubDate>
<guid>http://jaseg.de/blog/led-characterization/</guid>
<description><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>
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