MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module

🔥 MQ-4 Natural Gas Sensor Module (Methane / CNG) 
🛒 Popular MQ-4 Sensor Options
MQ-4 Methane Gas Sensor Module
Description: None
Price: ₹120
URL:
Number of Reviews: 18
Rating: 4.6
Featured Tag:
Merchants: Robocraze + others
MQ4 Gas Sensor for CNG Detection
Description: None
Price: ₹95
URL:
Number of Reviews: 9
Rating: 4.5
Featured Tag:
Merchants: Quartz Components
MQ-4 Natural Gas Detector Module
Description: None
Price: ₹135
URL:
Number of Reviews: None
Rating: None
Featured Tag:
Merchants: electronicscomp.com + others
MQ-4 Gas Sensor Breakout Board
Description: None
Price: ₹160
URL:
Number of Reviews: 5
Rating: 4.8
Featured Tag:
Merchants: Robu.in
Methane CNG Gas Sensor MQ4
Description: None
Price: ₹110
URL:
Number of Reviews: None
Rating: None
Featured Tag:
Merchants: Amazon.in
📌 Overview
The MQ-4 Gas Sensor Module is designed to detect methane (CH₄) and natural gas (CNG).
👉 Commonly used in:
🏠 Home gas leak detection
🏭 Industrial safety systems
🚗 CNG vehicle monitoring
🤖 IoT gas detection projects
🧠 Working Principle
Uses SnO₂ (Tin Dioxide) sensing material
In clean air → low conductivity
In presence of methane → conductivity increases
👉 The sensor converts this change into analog voltage output
✔ Similar working principle as other MQ-series sensors
📊 Infographic Summary
┌──────────────────────────────┐
│ 🔥 MQ-4 GAS SENSOR │
├──────────────────────────────┤
│ 🎯 Detects: Methane (CH₄) │
│ ⚡ Voltage: 5V │
│ 📏 Range: 300–10,000 ppm │
│ 🔌 Output: Analog + Digital │
│ 🔥 Type: Combustible Gas │
│ ⏱ Response: Fast │
└──────────────────────────────┘
🔌 Pin Configuration
┌──────────────┐
│ MQ-4 Module │
├──────────────┤
│ VCC → 5V
│ GND → Ground
│ AO → Analog
│ DO → Digital
└──────────────┘
⚙️ Key Specifications
⚡ Operating Voltage: 5V DC
📏 Detection Range: 300 – 10,000 ppm
🔌 Output:
Analog (gas concentration level)
Digital (threshold detection)
🔥 Sensitive Gas: Methane (CH₄), Natural Gas
🔋 Current Consumption: ~150 mA (heater required)
🌡 Operating Temperature: -10°C to 50°C
🌟 Key Features
🔥 High sensitivity to methane gas
⚡ Fast response and recovery
🔧 Easy to interface with Arduino/ESP32
💰 Low-cost sensor module
🔁 Adjustable sensitivity (potentiometer)
🧪 Applications
🏠 Domestic gas leakage alarm
🚗 CNG vehicle safety system
🏭 Industrial gas monitoring
🤖 IoT gas detection systems
🔔 Alarm systems with buzzer
🔗 Interfacing
Compatible with:
🔵 Arduino
📡 ESP32 / ESP8266
🍓 Raspberry Pi
👉 Use:
AO → measure gas concentration
DO → trigger alarm
⚠️ Important Notes
⏳ Requires preheating (24–48 hours) for stable readings
⚠️ Not highly selective (may respond to other gases slightly)
⚠️ High power consumption due to heater
⚠️ Not for precise ppm measurement
💬 Real-world insight:
MQ sensors are better for detection (presence) than exact measurement
🆚 MQ-4 vs MQ-6
Feature
MQ-4
MQ-6
Best For
Methane (CNG)
LPG, Butane
Gas Type
Natural gas
Cooking gas
Use Case
Vehicles, pipelines
Homes, kitchens
💡 Pro Tip
For a smart gas leak alarm:
MQ-4 + Buzzer 🔊 + LED 💡 + Microcontroller
👉 Detect methane leaks and alert instantly