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 # CO<sub>2</sub> Ampel
+[![Build Status](https://drone.makerlab-murnau.de/api/badges/CO2-ampel/software/status.svg)](https://drone.makerlab-murnau.de/CO2-ampel/software)
 
 *CO<sub>2</sub> Ampel* is an open-source project, written in C++ for [ESP8266](https://en.wikipedia.org/wiki/ESP8266) or [ESP32](https://en.wikipedia.org/wiki/ESP32).