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You are at 38c3 and came across one of the Datenzwerge? Awesome! Here's some quick links for you:
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You are at WHY2025 and came across one of the Datenzwerge? Awesome! Here's some quick links for you:
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- [What is the Datenzwerg?](#what-is-the-datenzwerg)
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- [FAQ](#faq)
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It was originally developed for the [Chaos Communication Camp 2023](https://events.ccc.de/camp/2023/infos/) where we ([@romses](https://chaos.social/@romses) and [@foosel](https://chaos.social/@foosel)) deployed a small army of 10 Datenzwerge across the camp grounds: Happy, Doc, Grumpy, Dopey, Bashful, Sleepy, Sneezy, Nerdy, Kinky and Hefty[^1]. Since then, Doc has gotten a new home at the CERT and the official Datenzwerg family now consists of Bashful, Dopey, Grumpy, Happy, Hefty, Kinky, Moopsy, Nerdy, Sleepy and Sneezy.
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The Datenzwerge also made a reappearance at the [37c3](https://events.ccc.de/congress/2023/infos/index.html), the [GPN22](https://entropia.de/GPN22) and the [MRMCD 2024](https://2024.mrmcd.net/de/). They are currently deployed at [38c3](https://events.ccc.de/congress/2024/infos/index.html).
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The Datenzwerg consists of a 3D printed gnome body, a custom PCB with an ESP8266 D1 Mini microcontroller board, a BME280, SGP30, UV and sound sensor and an optional 18650 battery. It's powered by [ESPHome](https://esphome.io/) and sends its data to an [InfluxDB](https://www.influxdata.com/) instance. The firmware currently logs temperature, relative and absolute humidity, air pressure, dew point, UV index, eCO2, TVOC and sound pressure.
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We asked ChatGPT to describe the Datenzwerg for us[^2] and this is what it came up with:
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> Welcome to the world of the Datenzwerg, an enchanting garden gnome with a technological twist!
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> This delightful little creature may look like your average garden decoration,
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> but it harbors a secret mission that is as intriguing as it is important.
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> The Datenzwerg is on a quest to collect environmental data and make it publicly available for the benefit of all.
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>
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> [...]
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>
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> By leveraging its unique vantage point in gardens and outdoor spaces,
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> the Datenzwerg provides an unparalleled perspective on the environment around us.
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>
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> All the data collected by these pint-sized environmental guardians is made freely
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> available to the public through an intuitive online platform.
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>
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> [...]
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>
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> At the upcoming Chaos Communication Camp, we are excited to introduce the Data Gnome to a
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> wider audience of tech enthusiasts, hackers, and environmental advocates.
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> This extraordinary convergence of nature and technology showcases the potential for
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> citizen-driven environmental monitoring.
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The Datenzwerge also made a reappearance at the [37c3](https://events.ccc.de/congress/2023/infos/index.html), the [GPN22](https://entropia.de/GPN22), the [MRMCD 2024](https://2024.mrmcd.net/de/) and [38c3](https://events.ccc.de/congress/2024/infos/index.html). They are scheduled to make an appearance at [WHY2025](https://why2025.org/).
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The Datenzwerg consists of a 3D printed gnome body, a custom PCB with an ESP8266 D1 Mini microcontroller board, a BME280, SCD41, UV and sound sensor and an optional 18650 battery. It's powered by [ESPHome](https://esphome.io/) and sends its data to an [InfluxDB](https://www.influxdata.com/) instance. The firmware currently logs temperature, relative and absolute humidity, air pressure, dew point, UV index, CO2 and sound pressure.
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## A short history of the Datenzwerg
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- Temperature
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- Relative humidity
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- Air pressure
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- eCO2
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- TVOC
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- CO2
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- UV sensor voltage
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- Microphone voltage
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- Battery voltage
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### What's the battery life?
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In our tests, a Datenzwerg without TVOC sensor seems to last between three to four days on a single charge of our 18650 LiPos that range from 1600mAh to 2800 mAh. This obviously depends on the cell capacity but also temperature and other environmental factors.
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In our tests, a Datenzwerg without CO2 sensor seems to last between three to four days on a single charge of our 18650 LiPos that range from 1600mAh to 2800 mAh. This obviously depends on the cell capacity but also temperature and other environmental factors.
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With the TVOC sensor included powering via a single 18650 LiPo is sadly not working out.
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With the CO2 sensor included powering via a single 18650 LiPo is sadly not working out.
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### Why are the measured temperatures that high during the day?
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The SCD41 sensors were sponsored by [@dx@mastodon.social](https://chaos.social/@[email protected]).
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[^1]: Yes, the last three are not canon, and one of them even is a smurf - so what, chaos ftw!
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[^2]: Prompt: 'Write me a text for a website that gives an overview of the "Datenzwerg". The Datenzwerg is a garden gnome that collects environmental data, and makes it publicly available. The Datenzwerg will be presented at the Chaos Communication Camp.'
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