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 SnO₂ (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
🔹 Output Type: Analog (AO) + Digital (DO)
🔹 Response Time: ≤10 seconds
🔹 Preheat Time: 2 min (basic) / up to 24 hrs for accuracy
🔹 Operating Temp: -10°C to 50°C
🔹 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 + Digital
Fast response and recovery
Low-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 selective (can detect multiple gases)
Requires 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 SnO₂ semiconductor sensing technology
Outputs analog + digital signals
Ideal for gas safety and IoT monitoring systems