MQ-135 Air Quality Gas Sensor Detection Module
The MQ-135 Air Quality Gas Sensor Module is a versatile environmental monitoring sensor designed to detect harmful gases and pollutants in the air. It can sense ammonia (NH₃), nitrogen oxides (NOx), carbon dioxide (CO₂), benzene, alcohol, smoke, and other volatile compounds. Featuring both analog and digital outputs, the module allows users to measure gas concentration levels and configure threshold-based detection using the onboard potentiometer. Operating at 5V with an integrated LM393 comparator, the MQ-135 is ideal for air quality monitoring systems, smart home devices, IoT applications, and educational projects.
تُعد وحدة استشعار جودة الهواء MQ-135 حلاً متعدد الاستخدامات لمراقبة جودة الهواء والكشف عن الغازات الضارة والملوثات البيئية. تستطيع الوحدة استشعار الأمونيا (NH₃)، وأكاسيد النيتروجين (NOx)، وثاني أكسيد الكربون (CO₂)، والبنزين، والكحول، والدخان، والمركبات المتطايرة الأخرى. تتميز بمخرجات تناظرية ورقمية، مما يتيح قياس مستويات تركيز الغازات وضبط حدود التنبيه باستخدام المقاومة المتغيرة المدمجة. تعمل الوحدة بجهد 5 فولت وتحتوي على مقارن LM393، مما يجعلها مناسبة لأنظمة مراقبة جودة الهواء وأجهزة إنترنت الأشياء والمشاريع التعليمية.
The MQ-135 Air Quality Gas Sensor Module is designed to monitor indoor air quality by detecting a broad range of harmful gases and airborne pollutants.
Built around the MQ-135 gas sensor element, this module can detect gases such as ammonia (NH₃), nitrogen oxides (NOx), carbon dioxide (CO₂), benzene, alcohol vapors, smoke, and other volatile organic compounds (VOCs). It is widely used in environmental monitoring systems, air purifiers, smart home devices, and industrial safety applications.
The module provides both analog and digital outputs, enabling flexible integration with microcontrollers and standalone systems. The analog output delivers a voltage proportional to the detected gas concentration, allowing users to estimate gas levels through software processing and calibration. The digital output uses an onboard LM393 comparator and adjustable potentiometer to trigger alerts when gas concentrations exceed a predefined threshold.
Operating at a typical voltage of 5V, the sensor requires a short preheating period before accurate measurements can be obtained. The integrated indicator LEDs provide visual feedback for power and gas detection status.
Compatible with popular platforms such as Arduino, ESP32, Raspberry Pi, and other microcontrollers, the MQ-135 is an excellent choice for DIY electronics, IoT projects, and air quality monitoring systems.
Specifications
| Specification | Details |
|---|---|
| Product Name | MQ-135 Air Quality Gas Sensor Module |
| Sensor Type | Gas and Air Quality Sensor |
| Operating Voltage | 2.5V – 5.0V DC |
| Typical Operating Voltage | 5V DC |
| Power Consumption | Approximately 150mA |
| Detected Gases | NH₃, NOx, CO₂, Alcohol, Benzene, Smoke, VOCs |
| Digital Output Voltage | 0V – 5V (TTL Logic) |
| Analog Output Voltage | 0V – 5V |
| Comparator IC | LM393 |
| Sensitivity Adjustment | Onboard 10k Potentiometer |
| Output Types | Analog and Digital |
| Preheating Requirement | Yes |
| Indicator LEDs | Power and Digital Output Status |
Pin Configuration
| Pin | Description |
|---|---|
| VCC | Power supply input (2.5V–5V) |
| GND | Ground connection |
| A0 | Analog output signal |
| D0 | Digital output signal |
Applications
- Indoor air quality monitoring
- Smart home automation systems
- Air purification devices
- Industrial safety monitoring
- Environmental monitoring stations
- HVAC systems
- IoT air quality projects
- Gas leakage warning systems
- Educational and research projects
- DIY electronics and prototyping