The CO2-Ampel is a traffic light to show the carbon dioxide concentration in a room.

This firmware version has a continuous color range from green (300ppm CO2) to red (1200ppm CO2) and no buzzer sound if > 1400ppm CO2.

• Microchip ATSAMD21 ARM Cortex-M0+ Microcontroller
• Sensirion SCD30 CO2 Sensor
• Intelligent WS2812 RGB-LEDs
• Acoustic Buzzer
• Plus Version:
  • Microchip ATWINC1500B WiFi/WLAN Network Controller
  • Microchip ATECC608 Cryptographic Co-Processor
• USB-C connector for power and data/programming
• USB CDC+MSC Bootloader (Arduino compatible)
• Open-Source and released under the Creative Commons Attribution Share-Alike License.
• Documentation on learn.watterott.com