How to measure CO2 with Arduino Uno using MH-Z19B

[@UnderscoreZeroLP]

These sensors take about 3 minutes to “warm up” and can be influenced by changes in temperature and humidity. MH-Z19C is improved version and Z19D is latest iteration.

[@playduino]

Thank you for the Information 👍

[@amirkharchi4273]

Hey after run cod the sensor give 0 ppm and -17 temp why?

[@MohamedAfzal]

SCD40 is better with small form factor

[@playduino]

SCD40 looks great 👍

[@svvnktmt]

I did as you instructed but the CO2 result is 0ppm or 10000ppm, can you tell me where I am wrong?

[@playduino]

Hey, what exactly did you do?

[@svvnktmt]

@@playduino I made your video tutorial: connect MH-Z19B to arduino uno r3, use the example in arduino ide to run

[@playduino]

Hi, I would give the Software Method a try: upload Calibration.ino: 1) Run this sketch for 20min outside during night, 2) important!: disconnect MHZ19 from device after sketch ends (20+ minutes) 3) upload new code to avoid recalibration.

[@zukarinkuari6842]

when i did it the error give me this i follow it all but have error 16:20:16.139 -> !Warning: Clearing Byte: 49 16:20:16.139 -> !Warning: Clearing Byte: 0 16:20:16.169 -> !Warning: Clearing Byte: 0 16:20:16.205 -> !Warning: Clearing Byte: 226 16:20:16.238 -> !Warning: Clearing Byte: 0 16:20:16.266 -> !Warning: Clearing Byte: 6 16:20:16.298 -> !Warning: Clearing Byte: 38 16:20:16.330 -> CO2 (ppm): 0

[@LabadisosJohn]

It says SoftwareSerialh: No such file or directory

[@playduino]

not sure if its just your comment but make sure that there is a dot: SoftwareSerial.h