About this item

🌿 MQ-135 Gas Sensor Module – Air Quality Sensor

The MQ-135 gas sensor module is designed for air quality monitoring by detecting various gases and airborne compounds. It is widely used with Arduino, ESP32, Raspberry Pi, and other microcontrollers for environmental monitoring and smart home projects.

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🛡️ Features & Advantages

• 🌿 Air quality monitoring
• 🌫️ Detects multiple gases
• 📡 Analog and digital outputs
• 🔧 Adjustable detection threshold via potentiometer
• ⚡ 5V power supply
• 🤖 Compatible with Arduino, ESP32, STM32, and Raspberry Pi

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📦 Technical Description

• 🧩 Sensor: MQ-135
• 🎯 Detected gases: NH₃ (ammonia), NOx, alcohol, benzene, smoke, CO₂ (indicative detection), and other volatile organic compounds
• ⚡ Supply voltage: 5V DC
• 📡 Analog output (AO): gas concentration level
• 🔔 Digital output (DO): adjustable detection threshold
• 🔧 Sensitivity adjustment: onboard potentiometer
• 🌡️ Recommended warm-up time: 20–60 seconds (longer for more stable measurements)

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🛠️ Applications

• 🏠 Indoor air quality monitoring
• 🌿 Environmental monitoring stations
• 🤖 Arduino and ESP32 projects
• 🚨 Smoke and gas detection
• 🧪 Educational and experimental applications

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⚠️ Usage Notes

• ❗ Warm-up time is required before reliable measurements
• 🔧 Calibration is recommended for improved accuracy
• 🛡️ Do not use as a certified measurement instrument
• 🌡️ Avoid extremely humid or heavily contaminated environments

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✨ Key Features

• 🌿 Air quality monitoring
• 🌫️ Multi-gas detection
• 📡 Analog and digital outputs
• 🔧 Adjustable sensitivity
• 📦 Compatible with Arduino, ESP32, and Raspberry Pi

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📦 Package Contents

• 1 × MQ-135 Gas Sensor Module