Description

The MQ-135 Gas Sensor Module is designed for air quality monitoring and is capable of detecting a wide range of harmful gases such as ammonia (NH₃), nitrogen oxides (NOx), alcohol, benzene, smoke, and carbon dioxide (CO₂). It features both analog and digital outputs, making it suitable for applications ranging from simple threshold detection to precise ppm (parts per million) measurements.

This module can be used directly with microcontrollers like Arduino, ESP32, or Raspberry Pi, and is ideal for smart air purifiers, gas leak detectors, and indoor air quality monitoring systems. The digital threshold can be adjusted via an onboard potentiometer.

Features:

• Gas Detection: NH₃, NOx, Alcohol, Benzene, Smoke, CO₂, etc.

• Operating Voltage: 5V DC

• Analog Output: 0–5V (proportional to gas concentration)

• Digital Output: 0V or 5V (TTL logic, adjustable threshold)

• Preheat Time: ~20 seconds

• Response Time: Fast with stable output

• Adjustable Sensitivity: Via onboard potentiometer

• Long service life and low power consumption

• Compatible with: Arduino, ESP32, Raspberry Pi, and other microcontrollers

Pin Configuration:

• VCC: +5V

• GND: Ground

• DO: Digital Output

• AO: Analog Output