Air Quality Sensor MQ135 (Analog/Digital)

Overview

Monitor the air you breathe with the MQ135 Air Quality Sensor, your reliable companion for detecting a wide range of harmful gases. This versatile sensor is a must-have for any environmental monitoring project, from smart home air purifiers to industrial safety systems. It accurately senses ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke, and CO2, making it an ideal choice for makers, students, and engineers in Egypt who are passionate about creating a healthier and safer environment. With both analog and digital outputs, the MQ135 integrates seamlessly into your Arduino, Raspberry Pi, or any microcontroller project, providing real-time data for intelligent decision-making.

Key Features

• Wide Gas Detection: Detects NH3, NOx, alcohol, benzene, smoke, CO2, and other harmful gases.
• Dual Output: Analog output for precise gas concentration readings, and digital output for threshold-based alerts.
• Adjustable Sensitivity: Onboard potentiometer to set the digital trigger threshold according to your application.
• Fast Response: Quick recovery and response time for real-time monitoring.
• Easy Integration: Compatible with Arduino, Raspberry Pi, and other microcontrollers.
• Compact Design: Small footprint, perfect for portable projects.

Technical Specifications

• Operating Voltage: 5V DC
• Load Resistance: Adjustable
• Heater Resistance: 33Ω ± 5%
• Heater Power Consumption: < 800mW
• Sensing Resistance: 1kΩ - 20kΩ (in clean air)
• Detection Range: 10 - 300 ppm (NH3, NOx, alcohol, benzene, smoke)
• Response Time: ≤ 1s
• Recovery Time: ≤ 30s
• Dimensions: 32mm x 20mm x 22mm (module)
• Weight: 7g
• Interface: Analog (A0) and Digital (D0) outputs, VCC, GND

Applications & Use Cases

• Air Quality Monitoring: Build a home air quality station to monitor indoor pollution.
• Smart Ventilation Systems: Automatically trigger exhaust fans when gas levels rise.
• Industrial Safety: Detect gas leaks in factories or workshops.
• Agricultural Monitoring: Monitor ammonia levels in poultry farms or greenhouses.
• Educational Projects: Ideal for science fairs and engineering coursework.
• IoT Environmental Sensors: Integrate with cloud platforms for remote monitoring.

What's Included

• 1x MQ135 Air Quality Sensor Module
• 1x Analog/Digital breakout board (pre-soldered)
• 1x Pin header (if not pre-soldered)
• (Note: Sensor module may require pre-heating for 24-48 hours for stable readings)

Compatibility

• Microcontrollers: Arduino (Uno, Mega, Nano), Raspberry Pi, ESP32, ESP8266, STM32, and any 5V logic microcontroller.
• Software: Works with Arduino IDE, Python (with ADC), and other programming environments.
• Power: 5V supply, low power consumption, suitable for battery-powered projects.

MOKWN Recommendation

Whether you're a hobbyist building your first air quality monitor or an engineer developing a sophisticated safety system, the MQ135 is a cost-effective and reliable choice. For best results, pair it with our DHT22 temperature/humidity sensor to compensate for environmental variations. Need help? Our Cairo-based team is ready to support your project with expert advice and fast delivery across Egypt.