Gravity: PWM NDIR Infrared Carbon Dioxide / CO2 Sensor (400-5000 ppm)

The Gravity: PWM NDIR Infrared Carbon Dioxide Sensor provides high-precision CO2 measurement across a standard indoor range of 400 to 5000 ppm. Utilising non-dispersive infrared technology, it is ideal for makers, educators, and engineers building indoor air quality monitors, smart HVAC ventilation systems, and greenhouse controllers.

High-accuracy NDIR sensing

Utilising non-dispersive infrared absorption, this module provides selective, quantitative CO2 measurement with 1 ppm resolution and accuracy of ±(50 ppm + 5% of reading). Readings are transmitted directly to your microcontroller via a standard PWM output signal.

Robust environmental stability

Featuring built-in temperature compensation, the sensor operates consistently across temperatures from -10°C to 50°C and humidity levels up to 95% RH (non-condensing). The design resists water vapour interference and exhibits minimal signal drift, reducing the need for frequent recalibration.

Five-year operational lifespan

The durable optical NDIR sensing core is engineered for up to five years of continuous service under normal operating conditions. With an average current draw of 40 mA at 5 V, it offers a dependable, low-maintenance solution for permanent building automation systems.

Practical monitoring applications

This module is suited for tracking indoor air quality in classrooms and offices, managing demand-controlled ventilation, and monitoring greenhouse environments. It includes a Gravity digital sensor cable for straightforward connection to microcontrollers.

Downloads & documentation

• Product wiki (DFRobot)