I read that you could calibrate it outdoor as outdoor is always around 400ppm. I already noticed that i get higher readings when there was an airflow at the sensor. Now i put it into an enclosure to prtotect it from airflows and other light. Maybe the indirect light on my table was causing this. I w...

Yes thats correct. I removed the stability check myself. Now it's reporting the values to MQTT. I calibrated the sensor after I put it outdoor for an hour and it showed about 400ppm. But when I take it inside it always reports about 900 and above even when I open all windows for some time. Is this n...

I have the same problem.
I always get Unstable Reading ...

33093152 : MHZ19: Unstable reading, ignoring! PPM value: 350 Temp/S/U values: 24/0/0.00

I think the wiring isn't the problem as it's really simple.

I'm using the latest dev Version from Github.

Any tipps?