Description
Description
The MQ135 Air Quality Sensor Module is a semiconductor gas detection module designed for indoor air quality monitoring and environmental measurement systems. It utilizes an SnO2 sensing element with stable sensitivity to NH3, NOx, CO2, benzene vapor, and smoke. Operating at 5V DC, the module provides both analog and digital TTL outputs with an adjustable threshold potentiometer for flexible integration. Built for reliable long-term operation, it ensures consistent response and recovery characteristics. Suitable for air quality stations, embedded control systems, and educational development platforms.
Features
- MQ135 SnO2 semiconductor sensing element
- Dual analog AO and digital DO outputs
- Adjustable digital threshold potentiometer
- Detection range 101000 ppm
- 5V DC operating voltage
- TTL compatible digital output
- Fast response and recovery characteristics
- Onboard power and status LEDs
- Compact PCB layout for embedded integration
- Compatible with Arduino and 5V microcontrollers
- Stable long-term operation
Specifications
- Operating Voltage: 5V DC
- Operating Current: 150mA
- Sensor Type: Semiconductor SnO2
- Detection Gases: NH3, NOx, CO2, Benzene, Smoke
- Detection Range: 101000 ppm
- Analog Output Voltage: 0.14V
- Digital Output Voltage: 0V or 5V TTL
- Preheat Time: 20s
- Sensitivity Adjustment: Onboard Potentiometer
- Interface Pins: VCC, GND, AO, DO
- Operating Temperature: -10C to 50C
- Module Dimensions: 32mm 20mm
Links
- MQ-135 Gas Sensor Datasheet
- MQ Type Gas Sensor 3D Model
- MQ Gas sensor 3D Case
Tutorials
- Arduino Air Quality Monitor with MQ135
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