DFRobot Gravity MiCS-4514 Multi-Gas Sensor

Most gas sensor modules detect one gas family at a time (an MQ-series sensor for combustibles, a dedicated NO2 sensor, and so on), which means building comprehensive air quality monitoring normally requires stacking several separate sensor boards. The MiCS-4514 packs detection for six distinct gases - carbon monoxide, ethanol, hydrogen, nitrogen dioxide, ammonia, and methane - onto one sensing element, with an I2C digital output handling the reading and reporting so no analog calibration curve needs to be built for each gas separately.

Each gas has its own genuinely useful measuring range rather than a single generic scale: CO from 1-1000ppm, NO2 down to a sensitive 0.05-10ppm, ethanol 10-500ppm, and so on - real coverage for both trace-level pollutant detection (NO2) and higher-concentration combustible gas monitoring (CH4, H2) from the same board. A rated lifespan over 2 years in normal air and a wide -30°C to 85°C operating range make it suitable for long-term unattended environmental monitoring rather than a short demo project.

Common uses are comprehensive indoor/outdoor air quality monitoring stations tracking multiple pollutants at once, industrial safety monitoring for combustible or toxic gas leaks, and environmental research projects needing multi-gas data from a single sensing point rather than several separate sensors.