The Datenzwerg is a garden gnome with a mission: To collect environmental data and make it publicly available.

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 and sends its data to an InfluxDB instance. The firmware currently logs temperature, relative and absolute humidity, air pressure, dew point, UV index, eCO2, TVOC and sound pressure.