MG811 Carbon Dioxide Sensor Module Key benefits and why you need it Reliable CO2 detection with improved accuracy: built-in temperature compensation reduces measurement error across changing environmental conditions so readings remain dependable. Flexible integration options: provides both an analog output and a digital level output (active-low) to match a wide range of microcontroller interfaces and control systems. Quick and simple setup: the active-low digital signal and standard analog range make wiring and programming straightforward for hobbyists and professionals alike. What it does and how it stands out Function: detects carbon dioxide concentration and outputs an analog voltage proportional to CO2 level plus a digital active-low signal for threshold detection or alarms. Performance: analog output spans 0–2 V for easy interpretation by ADC inputs; temperature compensation improves measurement stability in varying ambient conditions. Compatibility: designed to connect directly to microcontrollers and controllers that accept analog voltages and active-low logic signals (suitable for common platforms such as Arduino and similar systems). Form factor: delivered as a ready-to-use module for quick mounting and wiring into projects and systems. Practical applications Indoor air quality monitoring: integrate into home, office, or classroom systems to track CO2 and trigger ventilation when levels rise. HVAC and ventilation control: use the analog output for continuous monitoring and the active-low output to drive fans or alarms at preset thresholds. Environmental and educational projects: ideal for DIY air-sensing stations, greenhouse monitoring, lab experiments, and microcontroller learning projects. Technical highlights (consistent with original specifications) Dual outputs: analog and digital level output. Digital output: active-low signal for simple threshold switching. Analog output range: 0–2 V. Temperature compensation for improved measurement accuracy. Simple integration tips Read the 0–2 V analog output on an ADC channel to obtain proportional CO2 measurements. Use the active-low digital output for direct threshold-based control (alarm, relay, or transistor driver). Implement basic calibration routines and account for ambient temperature to maximize accuracy. Includes: MG811 carbon dioxide sensor module with analog (0–2 V) and active-low level outputs, temperature compensation feature for improved measurement accuracy.