The MikroElektronika Air quality 4 click board is an advanced air quality sensing device that combines multiple metal-oxide sensing elements on a chip to provide detailed information of the air quality parameters. This click board can output a total volatile organic compound (TVOC) value readings as well as the CO2 equivalent concentration readings in an indoor environment. It can also output raw values of H2 and ethanol in the air that can be used to calculate gas concentrations, relative to a reference concentration. The click uses the multi-pixel SGP30 gas sensors for indoor applications. These sensors use a dynamic baseline compensation algorithm and calibration parameters to provide accurate readings of TVOC and CO2 equivalent properties.

• On-board modules are Low Drop Out (LDO) voltage regulator, dual bidirectional I2C bus and SMBus voltage level shifter
• Provides libraries for computation on air quality
• Selectable input voltage ranges between 3.3V and 5V

• Air conditioning systems
• IoT
• Ventilation systems