Posts tagged with “co2”

Comparing MH-Z19B and SCD41: Building a Smarter CO₂ Monitor

Comparing MH-Z19B and SCD41: Building a Smarter CO₂ Monitor

A small device based on the MH-Z19B sensor has been sitting on my desk for years, quietly reminding me when it’s time to open a window and let some fresh air in. Its design is… well, not exactly elegant, but the utility more than makes up for any aesthetic shortcomings.
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Comparison of CO2 sensors MH-Z19B and CCS811

Comparison of CO2 sensors MH-Z19B and CCS811

I hooked up both the MH-Z19B and CCS811 CO₂ sensors side by side and logged data for a full week. The results? They mostly follow the same trends—but actual readings vary wildly, sometimes by 1000+ ppm. Which one’s accurate? Hard to say without a calibrated reference…

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