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MH-Z19b real CO2 air quality sensor "traffic light"

MH-Z19b real CO2 air quality sensor "traffic light"

thingiverse

A project housing for this build: http://esp8266-server.de/CO2Ampel.html#nano (The arduino Nano version at the bottom of the page) BOM: Arduino Nano MH-Z19b sensor WS2812B addressable RGB LED (snipplet of 5V LED strip) 4 PCs of counter suck screws M3X16 ... Nice and easy build to visualize when it is time to open the windows!

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