I have a weather station and have been having some issues with my mh-z19 co2 sensor returning bad values. I actually have two different problems: every second call the pulseIn line returns 0, when it doesn't return 0 the reading is exactly what it should be. I have tried different wiring configs …

pulseIn retuns zero every second time called

J-M-L April 6, 2018, 5:20pm 7

and GND are connected I suppose when you wire all this on your m0?

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