MQ-5 Gas Sensor For Methane(CNG), Propane, and Natural Gas Detector Module
MQ-5 Gas Sensor Module
Overview
Semiconductor gas sensor module for detecting flammable gases
Sensitive to Methane (CNG), Propane, LPG, Natural Gas
Widely used in gas leakage detection systems
Compatible with Arduino, ESP32, Raspberry Pi
Working Principle
Uses SnO (Tin Dioxide) sensing material
In clean air low conductivity
In presence of gas conductivity increases
Converts change into analog/digital output signal
Key Specifications
Operating Voltage: 5V DC
Detection Range: 200 10,000 ppm
10 seconds
Preheat Time: 2 min (basic) / up to 24 hrs for accuracy
Operating Temp: -10C to 50C
Power Consumption: ~800mW (heater)
Module Components
MQ-5 gas sensing element
Comparator IC (LM393)
Potentiometer (sensitivity adjustment)
Indicator LEDs (power & gas detection)
4 pins:
VCC
GND
AO (Analog Output)
DO (Digital Output)
Features
Detects LPG, methane, propane, butane, natural gas
Adjustable sensitivity via onboard potentiometer
Dual output: Analog + cost and easy to use
Applications
Gas leakage alarm systems
Smart home safety systems
Industrial gas monitoring
Kitchen gas detection
IoT-based safety projects
Usage Tips
Preheat sensor before use (important for accuracy)
Avoid exposure to alcohol, smoke, or cooking fumes (interference)
Use in well-ventilated area
Calibrate using known gas concentration if needed
Advantages
Low cost and widely available
Easy integration with microcontrollers
Detects multiple combustible gases
Simple analog/digital output
Limitations
Not highly seng>calibration for precise readings
Sensitive to temperature and humidity changes
Higher power consumption due to heater
Summary
Detects flammable gases like methane, LPG, propane
Uses SnO semiconductor sensing technology
Outputs analog + digital signals
Ideal for gas safety and IoT monitoring systems<