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Playing with Arduino, I developed a logger that writes data to an SD-card: CO2-level, temperature and relative humidity... I just tried out the thingie in our bedroom...

When I powered up the logger, I shut the bedroom window (left open the bedroom door though). Around 5.30 AM I woke up and opened the window... The impact on the CO2-level in the graph speaks for itself...

grafiek logger.png

 

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