MQ-135 Air Quality Sensor
—The MQ-135 is an air quality sensor that responds to ammonia, benzene, smoke and CO2-adjacent contaminants, used as a general indoor air indicator.
Specifications
- Detects NH3, NOx, benzene, smoke and CO2-like gases
- Analogue and digital outputs
- Adjustable digital threshold
- 5V supply with heater
- Requires burn-in and relative calibration
What you can build with the MQ-135 Air Quality Sensor
- Indoor air quality indicators
- Ventilation triggers in a workshop
- Classroom air experiments
- Trend monitoring rather than absolute readings
Compatibility
Works with Arduino, ESP32 and Pico via analogue input; a Pi needs an external ADC. Reports a relative trend, not calibrated ppm — for real CO2 figures use an NDIR sensor such as the MH-Z19B.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.
Availability: Sold out
The MQ-135 is an air quality sensor that responds to ammonia, benzene, smoke and CO2-adjacent contaminants, used as a general indoor air indicator.
Specifications
- Detects NH3, NOx, benzene, smoke and CO2-like gases
- Analogue and digital outputs
- Adjustable digital threshold
- 5V supply with heater
- Requires burn-in and relative calibration
What you can build with the MQ-135 Air Quality Sensor
- Indoor air quality indicators
- Ventilation triggers in a workshop
- Classroom air experiments
- Trend monitoring rather than absolute readings
Compatibility
Works with Arduino, ESP32 and Pico via analogue input; a Pi needs an external ADC. Reports a relative trend, not calibrated ppm — for real CO2 figures use an NDIR sensor such as the MH-Z19B.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.