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Detailed Description:

Monitor the air you breathe with the versatile MQ-135 Air Quality Sensor Module, a powerful tool for detecting a wide range of hazardous gases and air pollutants. Designed for use in both professional and educational applications, this module is a fundamental component for building comprehensive air quality monitoring systems. The sensor is highly sensitive to common pollutants like ammonia (NH3​), nitrogen oxides (NOx​), benzene, alcohol, and smoke, making it an all-in-one solution for assessing indoor air quality.

The module’s strength lies in its dual output functionality. For simple, threshold-based alarms, it offers a digital output (DO). You can easily adjust the sensitivity of this trigger point using the on-board potentiometer, allowing you to set a specific gas concentration to activate a warning light or buzzer. For more advanced projects, the analog output (AO) provides a continuous voltage signal that is directly proportional to the gas concentration. This allows you to log real-time data and display precise measurements in parts per million (PPM) on an LCD screen or a serial monitor.

Operating on a standard 5V DC supply, the MQ-135 module is fully compatible with popular microcontrollers like Arduino, ESP32, and Raspberry Pi. It is widely used in a variety of projects, including:

• Domestic and industrial air pollution detectors.

• Smart home systems for air purification.

• IoT-based environmental monitoring networks.

With its low cost, stable performance, and wide detection scope, the MQ-135 sensor is an essential component for any electronics project, that requires reliable and accurate air quality sensing.

The MQ-135 Air Quality Sensor Module is based on the MQ135 gas detection sensor, which can sense various harmful gases in the air such as carbon dioxide (CO₂), ammonia (NH₃), benzene, smoke, and VOCs. It offers both analog output (A0) for monitoring gas concentration and a digital output (D0) that can be triggered at a set threshold using the onboard potentiometer.

It is widely used in indoor air quality monitoring systems, smart city pollution detection projects, and DIY health/safety monitoring devices. The sensor responds quickly to changes in gas concentrations and can be easily calibrated using Arduino or ESP32-based platforms.

Key Features:

• Detects CO₂, NH₃, benzene, smoke, and VOCs

• Analog and digital output for flexible applications

• Onboard sensitivity adjustment potentiometer

• Compatible with Arduino, ESP32, Raspberry Pi, STM32

• High sensitivity and fast response time

• Ideal for air quality monitors, gas detectors, and IoT setups

• Low power consumption, long lifespan

Technical Specifications:

How to Use:

1. Connect VCC to 5V, GND to GND, and A0/D0 to analog/digital pins of your microcontroller.

2. Allow the sensor to preheat for 1–2 minutes after powering on.

3. Read analog values to assess air quality levels.

4. Adjust the potentiometer to set the digital output threshold.

Calibration tip: Use reference gas or clean air to determine baseline readings.

Applications:

• Indoor air quality monitoring systems

• Smart homes and green buildings

• IoT-based pollution detection

• Ammonia and VOC monitoring in industries

• Health and safety devices

• DIY weather stations and smart ventilation

• Agricultural and greenhouse air monitoring

Package Includes:

• 1 x MQ-135 Air Quality Gas Sensor Module