science_platform

bmp280

This sensor is the sensor of dfrobot not adafruit so it's not work at the moment, trying to fix errors.

Requirements:
- EspSoftwareSerial library from Arduino IDE(7.0.0 version used for this sensor)
- MHZ19 library (.rar file is given with source code, library can be installed through Arduino IDE>Sketch>Include Library> Add .ZIP library)
- For further information about this library you can visit https://github.com/crisap94/MHZ19
Some common errors you may encounter:
- The CO2 data may stuck at 5000 ppm, in order to fix that you can calibrate the sensor with the functions given in the library and source code. Some explaining was made about that in source file.
Calibration
- You can calibrate MH-Z19 with the given instructions in the source file or you may use the inside "MH-Z19C Calibration" file. Even though this file were given, you may download it from https://github.com/WifWaf/MH-Z19 (CAREFUL, this sketch used another library for MHZ19)
- HOW TO CALIBRATE: + Hardware Method
  By pulling the zero HD low (0V) for 7 seconds as per the datasheet. + Software Method You may run the code in "MH-Z19C Calibration", disconnect MH-Z19 from device after sketch ends (20+ minutes) and upload new code to avoid recalibration. + Auto calibration As it is mentioned inside "MH-Z19C Calibration" folder if this is set to true, the sensor will adjust it's self over a few weeks according to the lowest observed CO2 values each day. *You don't need to run this sketch!