MQ-6 Gas Sensor Module For Propane, Butane, And LPG Detector Module
📌 Overview
The MQ-6 Gas Sensor Module is widely used for detecting flammable gases like:
🔥 LPG (Liquefied Petroleum Gas)
🔥 Propane
🔥 Butane
It is commonly used in gas leakage detection systems for homes and industries.
🧠 Working Principle
The sensor uses SnO₂ (Tin Dioxide) as the sensing material.
In clean air → low conductivity
In presence of gas → conductivity increases
👉 This change is converted into an electrical signal.
📊 Infographic Summary
┌──────────────────────────────┐
│ 🔥 MQ-6 GAS SENSOR │
├──────────────────────────────┤
│ 🎯 Detects: LPG, Butane, │
│ Propane │
│ ⚡ Voltage: 5V │
│ 📏 Range: 200–10,000 ppm │
│ 🔌 Output: Analog + Digital │
│ ⏱ Response: Fast (<10 sec) │
│ 🔥 Type: Combustible Gas │
└──────────────────────────────┘
🔌 Pin Configuration
┌──────────────┐
│ MQ-6 Module│
├──────────────┤
│ VCC → 5V │
│ GND → Ground │
│ AO → Analog │
│ DO → Digital │
└──────────────┘
⚙️ Key Specifications
⚡ Operating Voltage: 5V DC
📏 Detection Range: 200–10,000 ppm
🔌 Output:
Analog (0–5V proportional to gas level)
Digital (HIGH/LOW threshold)
🔥 Sensitive to: LPG, propane, butane
🌡 Operating Temp: -10°C to 50°C
⚡ Current: ~150 mA (heater inside)
🌟 Key Features
🔥 High sensitivity to LPG gases
⚡ Fast response & recovery
🔧 Easy interface with microcontrollers
💰 Low cost and widely available
🔁 Adjustable threshold (via potentiometer)
🧪 Applications
🏠 Domestic gas leakage alarm
🏭 Industrial safety systems
🚗 Fuel leak detection
🤖 IoT gas monitoring systems
🔔 Alarm systems with buzzer
🔗 Interfacing
Compatible with:
🔵 Arduino
📡 ESP32 / ESP8266
🍓 Raspberry Pi
👉 Digital pin → simple ON/OFF detection
👉 Analog pin → gas concentration monitoring
⚠️ Important Notes
⏳ Requires preheating (24–48 hours) for accurate readings
🌫 Can also respond slightly to: smoke, alcohol
❌ Not highly precise (better for detection than measurement)
🆚 MQ-6 vs Other MQ Sensors
| Sensor | Best For |
|---|---|
| MQ-2 | Smoke + LPG (general use) |
| MQ-3 | Alcohol detection |
| MQ-4 | Methane detection |
| MQ-6 | LPG, Propane, Butane (best choice) |
💡 Pro Tip
For gas leakage alarm projects, combine:
MQ-6 sensor
Buzzer 🔊
Microcontroller
👉 When gas is detected → trigger alarm automatically
