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    <article class="post featured">
      <header class="major">
        <span class="date">May 1, 2024</span>
        <h2>
          <a href="Largest-Defsystem-Sensor-System.xml#header">Largest Defsystem Sensor System (so far)</a>
        </h2>
        <p>Quick presentation of our largest system so far. A sensor
      device for an automated IoT device, Nov. 2021.</p>
      </header>
      <a href="Largest-Defsystem-Sensor-System.xml#header" class="image main"><img src="images/Largest-DSSS/Largest-DSSS__DSC_0824_persp8x2yz.jpg" alt="Sensor system by Defsystem to measure environmental temperature and humidity"/>Lab setup of the Largest sensor system by Defsystem.</a>
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    <section class="posts">
      <article class="post">
        <header class="major">
          <span class="date">Mar 10, 2024</span>
          <h2>
            <a href="DSSS-and-Home-Assistant.xml#header">Defsystem Sensor Systems and Home Assistant</a>
          </h2>
        </header>
        <a href="DSSS-and-Home-Assistant.xml#header" class="image main"><img src="images/20240310-DSSS-and-Home-Assistant/DSC_0839xy_DSSS-Temp-Humid.jpg" alt="Sensor system by Defsystem to measure environmental temperature and humidity"/>Sensor system by Defsystem to measure environmental temperature and humidity</a>
        <p><a href="https://www.home-assistant.io/">Home Assistant</a>
      can be used as a backend for our sensor systems.  This gives you
      great power and options.<br/> Here we demonstrate this with our
      smallest system for monitoring temperature and humidity.</p>
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            <a class="button" href="DSSS-and-Home-Assistant.xml#header">Full Story</a>
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        <header class="major">
          <span class="date">Feb 23, 2024</span>
          <h2>
            <a href="Kombucha-IoT-System.xml#header">Kombucha sensor system by Defsystem</a>
          </h2>
        </header>
        <a href="Kombucha-IoT-System.xml#header" class="image main"><img src="images/Kombucha-IoT-System/DSC_1491s_kombuchaboot.jpg" alt="Kombucha IoT System by Defsystem"/>This software-defined sensor system downloads its user application securely from the Internet when it starts up.</a>
        <p>This was our first sensor system using uLisp® in Feb. 2021.
      It is a software-defined sensor system that monitors the PH level and liquid temperature while brewing Kombucha.</p>
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      <article class="post">
        <header class="major">
          <span class="date">Feb 22, 2023</span>
          <h2>
            <a href="Bottle-Fermentation-Sensor-Device.xml#header">Sensor device to monitor bottle fermentation</a>
          </h2>
        </header>
        <a href="Bottle-Fermentation-Sensor-Device.xml#header" class="image main"><img src="images/Bottle-Fermentation-Sensor-Device/20230210-Kombucha-bottles-with-analogue-gauge_labra-studio_1280.jpg" alt="Kombucha in Bottles, picture by Labra.studio."/>Kombucha in Bottles, picture by Labra.studio</a>
        <p>We have developed a prototype of a sensor device
      that should help to brew Kombucha that tastes better
      and doesn't explode.</p>
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      <article class="post">
        <header class="major">
          <span class="date">Nov 21, 2022</span>
          <h2>
            <a href="Filing-of-Patent-Application.xml#header">Filing of Patent Application</a>
          </h2>
        </header>
        <a href="Filing-of-Patent-Application.xml#header" class="image main">
          <img src="images/Filing-of-Patent-Application/markus-spiske-7PMGUqYQpYc-unsplash-16-9m.jpg" alt="a stamp on top of documents (picture by Markus Spiske, Erlangen, 2021)"/>
        </a>
        <p>
          Six months after the initial idea, our patent lawyer finished the
          final text of the patent application and it was filed at the German
          Patent and Trade Mark Office (DPMA) as of Nov 15th, 2022.
      </p>
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      <article class="post">
        <header class="major">
          <span class="date">Oct 31, 2022</span>
          <h2>
            <a href="Defsystem-UG-haftungsbeschraenkt.xml#header">Please welcome Defsystem UG (haftungsbeschränkt)</a>
          </h2>
        </header>
        <a href="Defsystem-UG-haftungsbeschraenkt.xml#header" class="image main">
          <img src="images/Defsystem-UG-haftungsbeschraenkt/DSC_0635_Strassburger13_per_cr-r.jpg" alt="Straßburger Str. 13"/>
        </a>
        <p>
          We are proud to announce the foundation of the Defsystem Unternehmergesellschaft (haftungsbeschränkt), a German entrepreneurial company with limited liability.
        </p>
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      <article class="post">
        <header class="major">
          <span class="date">May 16, 2022</span>
          <h2>
            <a href="ELS-2022-demo-slides.xml#header">Presentation slides for the demo at the ELS 2022</a>
          </h2>
        </header>
        <a href="ELS-2022-demo-slides.xml#header" class="image main">
          <img src="images/20220516-els-slides/demo-ulisp-els-2022_presentation-version-20220516_titlepage.jpg" alt=""/>
        </a>
        <p>
        Today, we release the extended presentation with
        many new demo slides and all source code of the demo
        <a href="IoT-devices-and-embedded-systems-with-uLisp.xml#header">»IoT devices and embedded systems with uLisp«</a>
        at this years <a href="https://www.european-lisp-symposium.org/2022/">European Lisp Symposium 2022</a>.
      </p>
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      <article class="post">
        <header class="major">
          <span class="date">April 7, 2022</span>
          <h2>
            <a href="Wi-Fi-provisioning-via-Bluetooth-BLE.xml#header">Instructions for Wi‑Fi provisioning via Bluetooth BLE</a>
          </h2>
        </header>
        <a href="Wi-Fi-provisioning-via-Bluetooth-BLE.xml#header" class="image main">
          <img src="images/WifiProv/ESP-BLE-Prov-03_20220327-120723_only-cam.jpg" alt=""/>
        </a>
        <p>
        This is the documentation for the Wi‑Fi provisioning method
        that we have implemented for the Defsystems atoms mentioned
        in the previous post
        <a href="defsystem-atom-IoT-devices.xml">Defsystem atoms ready</a>.
      </p>
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      <article class="post">
        <header class="major">
          <span class="date">March 21, 2022</span>
          <h2>
            <a href="defsystem-atom-IoT-devices.xml#header">Defsystem atoms ready</a>
          </h2>
        </header>
        <a href="defsystem-atom-IoT-devices.xml#header" class="image main">
          <img src="images/defsystem-atom-IoT-devices/defsystem-atoms.jpg" alt=""/>
        </a>
        <p>
        Ten ESP32 computers arrived and are prepared for the <a href="IoT-devices-and-embedded-systems-with-uLisp.xml">demo at
        the European Lisp Symposium 2022</a>.
      </p>
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      <article class="post">
        <header class="major">
          <span class="date">Mar 6, 2022</span>
          <h2>
            <a href="IoT-devices-and-embedded-systems-with-uLisp.xml#header">IoT devices and embedded systems with uLisp</a>
          </h2>
        </header>
        <a href="IoT-devices-and-embedded-systems-with-uLisp.xml#header" class="image main">
          <img src="images/IoT-devices-and-embedded-systems-with-uLisp/FEUP_building.jpg" alt="FEUP building in Porto, Portugal"/>
        </a>
        <p><!--Demo: IoT devices and embedded systems with uLisp at the European Lisp Symposium 2022 in Porto, Portugal, March 21st - March 22nd 2022.-->
          Meet us at the <a href="https://www.european-lisp-symposium.org/2022/">European Lisp Symposium 2022</a>
          in Porto! We will give a demo »IoT devices and embedded systems with uLisp«.
          ELS 2022, FEUP, Porto, Portugal, March 21st – March 22nd 2022.
        </p>
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