The MH-Z19B NDIR CO2 sensor should be preheat for 3 minutes to be stable. Start Arduino Uno R3 along with MH-Z19B NDIR CO2 ...
MH-Z19 Tx to Arduino Digital Pin (Serial Rx pin) MH-Z19 Rx to Arduino Digital Pin (Serial Tx pin) other MH-Z19 pins are not used.
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