Gravity: MiCS-4514 Multi-Gas Sensor Module for Arduino / ESP32 / Raspberry Pi | I2C MEMS Air Quality Sensor Detects CO NO2 NH3 Alcohol H2 CH4 | Built-in Algorithm ppm Output for DIY IoT Projects

DFRobot Gravity: MEMS Gas Sensor(CO, Alcohol, NO2 & NH3) - I2C - MiCS-4514 Introduction This is a MEMS gas concentration sensor from DFRobot, supports the detection of various gas concentrations like CO, C2H5OH (Alcohol), H2, NO2, NH3. Specification Detection of Physical Quantities: gas concentration of CO，C2H5OH(Alcohol), H2, NO2, NH3, CH4 Operating Voltage: 3.3～5.5V DC Power Dissipation: 0.45W（5V） Output Signal: I2C（0~3V） Working Temperature: -30～85℃ Working Humidity: 5～95%RH （No condensation） Storage Temperature: -40~85℃ Lifespan: >2 years （in the air） Circuit Board Size: 27mm\*37mm Mounting Hole Size: inner diameter 3.1mm/outer diameter 6mm Measuring Range: 1 – 1000ppm(Carbon monoxide CO ) 0.05 – 10ppm(Nitrogen dioxide NO2 ) 10 – 500ppm( Ethanol C2H5OH ) 1 – 1000ppm(Hydrogen H2) 1 – 500ppm(Ammonia NH3 ) >1000ppm(Methane CH4 ) Shipping list Gravity: MEMS CO, Alcohol, NO2 & NH3 Gas Sensor *1 Gravity-4pin I2C Cable *1

• [MULTI-GAS DETECTION] Powered by the MiCS-4514 MEMS sensor, this single module simultaneously measures the concentration of Carbon Monoxide (CO: 1-1000ppm), Nitrogen Dioxide (NO2: 0.05-10ppm), Ammonia (NH3: 1-500ppm), Ethanol/VOCs (10-500ppm), Hydrogen (H2: 1-1000ppm), and Methane (CH4: >1000ppm).
• [ONBOARD MCU & DIRECT ppm OUTPUT] Unlike raw analog gas sensors that rely on a host microcontroller for complex ADC sampling, this module features an independent onboard MCU pre-programmed with concentration conversion formulas. It streams estimated ppm data directly via the I2C bus, ensuring consistent accuracy across any microcontroller and saving hours of firmware tuning.
• [PLUG-AND-PLAY, NO SOLDERING] Equipped with the standardized Gravity 4-pin I2C interface and an included foolproof cable, the sensor can be connected in seconds. Open-source Arduino libraries are available, enabling rapid prototyping and TinyML "Electronic Nose" projects.
• [COMPATIBLE WITH ARDUINO, ESP32 & RASPBERRY PI] With a 3.3V to 5.5V wide operating voltage and low power consumption, the module is fully compatible with Arduino, ESP32, and Raspberry Pi. Its compact 27x37mm footprint and durable MEMS design ensure a stable lifespan for long-term environmental monitoring nodes.
• NOTE: All MEMS gas sensors exhibit cross-sensitivity to various gases. This module is ideal for qualitative trend analysis, TinyML electronic nose projects, and IoT prototyping rather than industrial-grade absolute measurement. It requires a 24-hour initial burn-in and a few minutes of preheating upon each power-up for stable readings.