1.5.2

• Fix environmental correction ratio (issue #41). There was an exchange between the equation of 85% humidity and 30% humidity correction. Thanks to @JosephJohnZ for noticing this!

1.5.1

• Fix compiling issue coming from the last patch

1.5.0

• Add support for MQ131 low concentration version SnO2; thanks to @Kesavaram !

1.4.4

• Fix valueRL as uint32_t in place of uint16_t. Thanks to @ferreiradiego to notice it.

1.4.3

• Update library.properties to update Arduino Library repository

1.4.2

• Go back to previous equations to calculate the concentration because there are aligned with 0ppm/ppb even if the R^2 is a bit lower...

1.4.1

• Fix the environmental adjustment based on data sheet

1.4.0

• Some changes in the documentation
• Fixes in the environmental correction
• Improve the conversion functions (Rs to PPM values)
• Add Python scripts to compute the conversion functions
• Bug fixing

1.3.1

• Update library.properties

1.3.0

• Cleanup the code with standard type
• Add examples
• Setup the defaults with 1MOhms load resistance as defined in the datasheet
• Change the schematics to use MOSFET N-channel
• Add Fritzing file
• Add optional debugging feature during calibration
• Prepare to comply with Arduino library format
• Add keywords for Arduino IDE