The MQ-135 is an air quality sensor that detects gases like ammonia, alcohol, and smoke. It provides analog output for monitoring air pollution levels.
The MQ-135 Air Quality Sensor is a popular sensor module used for detecting air quality and measuring various gases, including ammonia (NH₃), nitrogen oxide (NO), alcohol, benzene, carbon dioxide (CO₂), and smoke. It is commonly used in air quality monitoring applications, environmental monitoring, and industrial control systems. The sensor detects the concentration of benzene, alcohol and smoke in the air, the result can be obtained measuring the voltage on the analog output. The system is supplied with the voltage from 2.5V to 5V. It has a digital and analog output, making it compatible with most of the commissioning modules including Raspberry Pi and Arduino.
Features
Wide detection range for multiple gases.
High sensitivity with fast response time.
Stable performance with long operational life.
Dual analog and digital output options.
Adjustable sensitivity through onboard potentiometer.
Simple drive circuit for easy interfacing.
Compact design with mounting holes for easy installation.
Specifications
Parameter
Value
Operating Voltage
5VDC
Power Consumption
≤800mW
Detection Range
10–1000ppm
Analog Output
0–5V
Digital Output
0V or 5V (TTL Logic)
Preheat Time
≥24 hours
Operating Temperature
-10°C to 45°C
Storage Temperature
-20°C to 70°C
Humidity Range
<95%RH
Heater Resistance
33Ω±5%
Load Resistance
Adjustable
Dimensions
35mm x 22mm x 23mm
PINOUT
Pin No:
Pin Name:
Description
For Module
1
Vcc
Used to power the sensor, Generally the operating voltage is +5V.
2
Ground
Used to connect the module to system ground.
3
Digital Out
You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.
4
Analog Out
This pin outputs 0-5V analog voltage based on the intensity of the gas.
For Sensor
1
H -Pins
Out of the two H pins, one pin is connected to supply and the other to ground
2
A-Pins
The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.
3
B-Pins
A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.
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