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"content": "<p>My first scientific paper has been published! 📰 🎉</p><p>Büchau (2022): An Autarkic Wireless Sensor Network to Monitor Atmospheric CO2 Concentrations</p><p><a href=\"https://doi.org/10.1127/metz/2022/1125\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">doi.org/10.1127/metz/2022/1125</span><span class=\"invisible\"></span></a></p><p>In my PhD I am building a wireless CO2 sensor network with mostly <a href=\"https://fosstodon.org/tags/FOSS\" class=\"mention hashtag\" rel=\"tag\">#<span>FOSS</span></a> components. This paper describes it.</p><p>Code and hardware designs are available here: <a href=\"https://gitlab.com/tue-umphy/co2mofetten\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">gitlab.com/tue-umphy/co2mofett</span><span class=\"invisible\">en</span></a></p><p><a href=\"https://fosstodon.org/tags/raspberrypi\" class=\"mention hashtag\" rel=\"tag\">#<span>raspberrypi</span></a> <a href=\"https://fosstodon.org/tags/esp8266\" class=\"mention hashtag\" rel=\"tag\">#<span>esp8266</span></a> <a href=\"https://fosstodon.org/tags/mqtt\" class=\"mention hashtag\" rel=\"tag\">#<span>mqtt</span></a> <a href=\"https://fosstodon.org/tags/co2\" class=\"mention hashtag\" rel=\"tag\">#<span>co2</span></a> <a href=\"https://fosstodon.org/tags/arduino\" class=\"mention hashtag\" rel=\"tag\">#<span>arduino</span></a> <a href=\"https://fosstodon.org/tags/sensor\" class=\"mention hashtag\" rel=\"tag\">#<span>sensor</span></a> <a href=\"https://fosstodon.org/tags/network\" class=\"mention hashtag\" rel=\"tag\">#<span>network</span></a> <a href=\"https://fosstodon.org/tags/python\" class=\"mention hashtag\" rel=\"tag\">#<span>python</span></a></p>",
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"en": "<p>My first scientific paper has been published! 📰 🎉</p><p>Büchau (2022): An Autarkic Wireless Sensor Network to Monitor Atmospheric CO2 Concentrations</p><p><a href=\"https://doi.org/10.1127/metz/2022/1125\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">doi.org/10.1127/metz/2022/1125</span><span class=\"invisible\"></span></a></p><p>In my PhD I am building a wireless CO2 sensor network with mostly <a href=\"https://fosstodon.org/tags/FOSS\" class=\"mention hashtag\" rel=\"tag\">#<span>FOSS</span></a> components. This paper describes it.</p><p>Code and hardware designs are available here: <a href=\"https://gitlab.com/tue-umphy/co2mofetten\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">gitlab.com/tue-umphy/co2mofett</span><span class=\"invisible\">en</span></a></p><p><a href=\"https://fosstodon.org/tags/raspberrypi\" class=\"mention hashtag\" rel=\"tag\">#<span>raspberrypi</span></a> <a href=\"https://fosstodon.org/tags/esp8266\" class=\"mention hashtag\" rel=\"tag\">#<span>esp8266</span></a> <a href=\"https://fosstodon.org/tags/mqtt\" class=\"mention hashtag\" rel=\"tag\">#<span>mqtt</span></a> <a href=\"https://fosstodon.org/tags/co2\" class=\"mention hashtag\" rel=\"tag\">#<span>co2</span></a> <a href=\"https://fosstodon.org/tags/arduino\" class=\"mention hashtag\" rel=\"tag\">#<span>arduino</span></a> <a href=\"https://fosstodon.org/tags/sensor\" class=\"mention hashtag\" rel=\"tag\">#<span>sensor</span></a> <a href=\"https://fosstodon.org/tags/network\" class=\"mention hashtag\" rel=\"tag\">#<span>network</span></a> <a href=\"https://fosstodon.org/tags/python\" class=\"mention hashtag\" rel=\"tag\">#<span>python</span></a></p>"
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"name": "An Autarkic Wireless Sensor Network to Monitor Atmospheric CO2 Concentrations\n\nAbstract\nIn this study an autarkic low-cost wireless network infrastructure suitable for areas spanning a couple of\nhectares is introduced. Open source hard- and software components make up the infrastructure’s core,\nrendering it very scalable in terms of cost and deployment density. The network is designed to operate\ncontinuously throughout the year in a wide range of weather conditions.Four different embedded, low-cost\nSensirion SCD30 non-dispersive infrared (NDIR) CO 2 sensors are evaluated under laboratory conditions\nand tested for cross-sensitivity on water vapour and linear characteristics, of which the Sensirion SCD30\nsensor exhibits the best overall performance. An in-field comparison of eleven Sensirion sensors with\nan eddy-covariance station verifies its outdoor applicability. The network’s suitability to monitor natural\nCO 2 emissions was tested at a site in the upper Neckar Valley in southwestern Germany. A station with\na single Sensirion sensor observed a strong diurnal cycle of the near-surface CO 2 concentration over the\ncourse of several months. While only slightly elevated CO 2 levels above 400 ppm prevailed during the day,\nconcentrations reached the sensor’s output limit of 40 000 ppm during the night when wind speeds are low.",
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"name": "Figure 1: Aerial view of the Starzach site taken in summer 2019 by Martin Schön and map of Germany with part of the Neckar valley\nregion as orientation. Visible focused CO 2 exhalation spots are marked as yellow dots, their size loosely indicating the apparent intensity.\nFields of diffuse degassing are indicated as purple areas. Degassing spots appear in SW-NE direction across the site and are discussed by\nLübben and Leven (2018) to be associated with a geological fault line. Map data ' OpenStreetMap contributors (2021).",
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"name": "Figure 3: Network infrastructure schematic. An on-site single-board\ncomputer acts as a central station and establishes a Wireless Local\nArea Network (WLAN) to which all stations connect. Stations store\ntheir sensor data locally and transmit it wirelessly to the central\nstation, where data is logged to a database. The central station\nmaintains an internet connection to an off-site server to enable\nremote maintenance and live data monitoring. This server mirrors\nthe on-site network traffic and relays a selection of the measurements\nto the openSenseMap platform for data display and live monitoring.",
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"name": "Figure 4: General design of a sensor station. (a) An ESP8266 microcontroller mounted on a custom circuit board in a weatherproof box\nis powered externally via a 12 V two-wire cable. (b) A custom circuit board capable of holding up to eight Sensirion SCD30 CO 2 sensors\nmounted below a simple radiation shield is connected to the microcontroller via a patch cable with RJ45 connector. (c) Radiation shield\nholding a custom multi-sensor circuit board with Sensirion SCD30 CO2 sensor, Bosch BME280 environmental sensor (atmospheric pressure,\ntemperature, relative humidity), CUBIC CM1106 CO 2 sensor and theben CO 2 Sensor Module.",
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