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• Inside of Sensirion's SCD4x

  The SCD4x sensor from Sensirion measures CO₂, temperature, and humidity, and communicates these values via I²C. The measurement principle for the CO2 is that of photoacoustic sensing. The fundamental principle is shown in the diagram below: shine light that the CO2 molecules absorb and use a microphone to listen to the pressure variations. I ordered a batch of SCD41 sensors from China for various projects, including fermentation, mushroom and plant cultivation, and field monitoring....