The MQ-4 Methane Gas Sensor Module is designed to detect methane (CH₄) and is commonly used for natural-gas detection applications.
The MQ-4 uses a semiconductor sensing element whose electrical characteristics change when exposed to the target gas. This change can be measured by an electronic circuit and used as an input for a microcontroller or monitoring system.
The MQ-4 sensor has high sensitivity to methane and is specified for a methane detection range of approximately 300–10,000 ppm under specified test conditions.
The module version provides analog and digital outputs, allowing it to be used either for reading a changing sensor signal or for threshold-based detection. The onboard adjustment control can be used to configure the digital trigger threshold on compatible module designs.
It is suitable for Arduino, IoT, environmental monitoring, gas-detection experiments, automation, and STEM projects.
This product is intended for educational, hobby, and prototyping applications and should not be treated as certified life-safety gas detection equipment.
Technical Specifications
- Technical Specification: Semiconductor methane gas sensor with analog and digital module outputs.
- Sensor Type: Semiconductor Gas Sensor
- Target Gas: Methane (CH₄)
- Detection Range: Approximately 300–10,000 ppm methane
- Operating Voltage: 5V DC
- Output: Analog (AO) and Digital (DO)
- Sensitivity: Adjustable through the module’s onboard control
- Sensing Material: Tin Dioxide (SnO₂)
Detailed Product Specifications
| Specification | Details | Sensor Type | Semiconductor Gas Sensor | Model | MQ-4 | Target Gas | Methane (CH₄) | Natural Gas Detection | Suitable for Natural Gas / Methane Detection | Detection Range | Approximately 300–10,000 ppm Methane | Operating Voltage | 5V DC | Output Type | Analog + Digital | Analog Output | AO | Digital Output | DO | Sensitivity Adjustment | Adjustable | Sensing Material | SnO₂ (Tin Dioxide) | Application | Gas Detection, IoT, Automation & STEM | Quantity | 1 Piece |
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Key Features
- Designed primarily for methane detection
- Suitable for natural-gas detection experiments
- Semiconductor-based sensing technology
- Analog output for sensor signal monitoring
- Digital output for threshold-based detection
- Adjustable sensitivity/trigger threshold
- Suitable for microcontroller projects
- Useful for IoT and environmental monitoring
- Suitable for gas-detection experiments
- Useful for STEM and electronics education
Recommended Applications
- Methane detection projects
- Natural-gas monitoring prototypes
- Gas leakage detection experiments
- IoT gas-monitoring systems
- Environmental monitoring
- Automated warning systems
- Sensor data-logging projects
- Arduino gas-sensing projects
- Robotics and automation projects
- STEM laboratory experiments
- Smart-home gas-monitoring prototypes
Educational Applications
The MQ-4 can be used to teach students about:
- Semiconductor gas sensing
- Methane detection
- Sensor resistance and conductivity
- Analog sensor readings
- Digital threshold detection
- Microcontroller interfacing
- Sensor data logging
- Automation logic
- IoT monitoring
- Environmental sensing
Project Possibilities
The MQ-4 can be used as a gas-sensing input in projects such as:
MQ-4 Sensor → Microcontroller → Program Logic → Indicator / Alarm / Display
Possible projects include methane-monitoring demonstrations, natural-gas detection prototypes, sensor data logging, and threshold-based warning systems.
What’s Included
- 1 × MQ-4 Methane Gas Sensor Module
Important Notes
- The MQ-4 is primarily sensitive to methane/natural gas but its response can be affected by environmental conditions and other gases.
- The stated detection range applies under specified sensor test conditions and should not be interpreted as guaranteed measurement accuracy in every environment.
- The analog output should not be treated as a directly calibrated PPM reading without appropriate calibration and measurement methodology.
- The sensor requires a heating element during operation.
- Sensor performance depends on warm-up, environmental conditions, calibration, and the surrounding measurement circuit.
- This product is intended for educational, hobby, and prototyping applications and should not replace certified gas detection or safety equipment.
- Use appropriate safety precautions when working with combustible gases.
Why Choose It?
The MQ-4 Methane Gas Sensor Module provides a practical way to introduce methane and natural-gas sensing into electronics projects. Its combination of analog and digital outputs allows students and developers to experiment with both sensor-data monitoring and threshold-based automation.
It is suitable for Arduino, IoT, robotics, environmental monitoring, automation, and STEM education projects.
Product Summary
The MQ-4 Methane Gas Sensor Module is a semiconductor gas-sensing module designed primarily for methane and natural-gas detection. With an approximate 300–10,000 ppm methane detection range, 5V operation, analog and digital outputs, and adjustable sensitivity, it is suitable for gas-detection experiments, IoT, automation, environmental monitoring, robotics, and STEM education.
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