The MQ-135 Air Quality Hazardous Gas Sensor Module for Arduino uses a sensitive Tin Dioxide (SnO2) sensing layer that changes conductivity when exposed to polluted air, letting you monitor common indoor pollutants such as ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke and CO2. The board provides both a linear analog output for logging concentration trends and a digital output driven by an onboard LM393 comparator for simple alarm thresholds, and it mounts on a standard 4‑pin header (VCC, GND, DO, AO) that fits breadboards and Arduino shields. It can be calibrated against clean‑air Ro values to estimate PPM and includes an active heater that needs an initial 24‑hour burn‑in to stabilize readings—practical for makers building monitors or ventilation controls.
The MQ-135 Air Quality Hazardous Gas Sensor Module for Arduino uses a sensitive Tin Dioxide (SnO2) sensing layer that changes conductivity when exposed to polluted air, letting you monitor common indoor pollutants such as ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke and CO2. The board provides both a linear analog output for logging concentration trends and a digital output driven by an onboard LM393 comparator for simple alarm thresholds, and it mounts on a standard 4‑pin header (VCC, GND, DO, AO) that fits breadboards and Arduino shields. It can be calibrated against clean‑air Ro values to estimate PPM and includes an active heater that needs an initial 24‑hour burn‑in to stabilize readings—practical for makers building monitors or ventilation controls.
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Product Overview
Product Overview
The MQ-135 Air Quality Hazardous Gas Sensor Module for Arduino uses a sensitive Tin Dioxide (SnO2) sensing layer that changes conductivity when exposed to polluted air, letting you monitor common indoor pollutants such as ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke and CO2. The board provides both a linear analog output for logging concentration trends and a digital output driven by an onboard LM393 comparator for simple alarm thresholds, and it mounts on a standard 4‑pin header (VCC, GND, DO, AO) that fits breadboards and Arduino shields. It can be calibrated against clean‑air Ro values to estimate PPM and includes an active heater that needs an initial 24‑hour burn‑in to stabilize readings—practical for makers building monitors or ventilation controls.
