Methane Gas Sensor MQ4 (Analog/Digital)

Overview

The MQ-4 Methane Gas Sensor is a highly sensitive and reliable sensor designed for detecting methane (CH4) and natural gas leaks. It is an essential component for home safety systems, industrial monitoring, and IoT-based environmental sensing applications. With both analog and digital output options, it offers flexibility for various microcontroller projects, making it a favorite among makers and engineers in Egypt.

Key Features

• High Sensitivity to Methane: Detects methane concentrations ranging from 300 to 10,000 ppm, ideal for early leak detection.
• Dual Output: Provides both analog (voltage proportional to gas concentration) and digital (TTL-level with adjustable threshold) outputs.
• Adjustable Sensitivity: Onboard potentiometer allows you to set the digital output trigger threshold.
• Fast Response: Quick response and recovery times ensure timely alerts.
• Low Power Consumption: Heater consumes only 750mW, suitable for battery-powered applications.
• Long Service Life: Robust design ensures stable performance over extended periods.

Technical Specifications

• Operating Voltage: 5V DC
• Heater Resistance: 33Ω ± 5%
• Heater Power Consumption: ≤750mW
• Sensing Range: 300 – 10,000 ppm (methane)
• Output: Analog voltage (0-5V) and Digital TTL (high/low)
• Interface: 4 pins (VCC, GND, AO, DO)
• Module Size: 32mm x 22mm x 27mm (L x W x H)
• Weight: 7g
• Preheating Time: Over 48 hours for initial use, 5 minutes for normal operation

Applications & Use Cases

• Home Gas Leak Detectors: Integrate with alarm systems to alert families to methane leaks.
• Industrial Safety Monitoring: Monitor gas levels in factories, warehouses, and processing plants.
• IoT Smart Home Systems: Connect to microcontrollers like Arduino, ESP32, or Raspberry Pi for remote monitoring.
• Environmental Monitoring: Track methane levels in agricultural or research settings.
• Educational Projects: Perfect for STEM education, teaching students about gas sensing and embedded systems.

What's Included

• 1x MQ-4 Methane Gas Sensor Module (analog and digital outputs)
• (Note: No additional cables or microcontrollers are included.)

Compatibility

• Works with all major microcontrollers: Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC, and more.
• Analog output can be read via ADC pins; digital output connects directly to GPIO pins.
• Compatible with MOKWN's range of development boards and sensor kits.

MOKWN Recommendation

The MQ-4 sensor is a must-have for any maker focused on safety and environmental projects. Whether you're building a home alarm system or an industrial monitoring solution, its dual output and adjustable sensitivity make it versatile and easy to integrate. Pair it with an Arduino or ESP32 from MOKWN's collection to get started quickly. For accurate readings, ensure proper calibration and preheating as per the datasheet.