This is the DIY Kit for the project. is a CO2 Measurement device that has a RGB Led and a Buzzer and notifies you when it is time to open the windows and let some fresh air in.

The LED shines in bright green when the PPM (parts per million) is below a certain threshold and turns yellow if it rises above that value and plays a short notification sound.
If the CO2 reading is far too high it will start to blink red and produce an alarm sound.

The bright OLED Display shows the current PPM reading.
We use a high accuracy CO2 Sensor based on NDIR technology.


It includes all the parts needed to build your own device.

This kit includes:

  • 1 High precision CO2 Sensor
  • 1 Microcontroller Board with the Software already installed
  • 1 OLED Display yellow/blue
  • 1 Buzzer
  • 1 RGB LED (10mm)
  • 1 Resistor Array
  • 1 Capacitor
  • 1 Pushbutton
  • 1 Power Plug
  • 1 PCB
  • 1 Enclosure
  • 1 Lasercut Acrylic Cover
  • Product information


You will need a soldering station, solder and small pliers to assemble the kit.

The software is already installed, configured and ready to use upon delivery.
Of course the firmware can be upgraded anytime, as it is 100% Open Source.

The Firmware is written in modular and modern micropython and offers a broad range of functions.


Software features:

  • Stand alone Offline operation
  • Accesspoint Mode
  • Web-based Configuration Interface
  • Internet / WLAN Integration (optional)
  • Online Datacollection and aggregation
  • Sensor Calibration
  • Online Registration of Device location and other relevant parameters (optional)
  • Built-in Dashboard with Graphs


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