First measurement is not correct

WifWaf / MH-Z19

For Arduino Boards (&ESP32). Additional Examples/Commands., Hardware/Software Serial

GNU Lesser General Public License v3.0

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First measurement is not correct #20

Closed Eldenroot closed 4 years ago

Eldenroot commented 4 years ago

I have mhz-19b

first measurement is not accurate, it returns always about 450 ppm, but the second if is correct (tested and compared with my second commercial device).

I use delay 60 second before the first read, is there anything what can be done better? Thank you!

WifWaf commented 4 years ago

Readings on bootup are erroneous, are you using the filter mode/function?

WifWaf commented 4 years ago

Closing due to stagnation - let me know if you still need help (raise a new issue)