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MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

β‚Ή133.00Price
πŸ”₯ MQ-9 Gas Sensor Module – CO, Methane & LPG Detector 
πŸ“Œ Overview
The MQ-9 Gas Sensor Module is a versatile gas sensor designed to detect:
  • ☠️ Carbon Monoxide (CO)
  • πŸ”₯ Methane (CHβ‚„)
  • πŸ›’ LPG (Liquefied Petroleum Gas)
πŸ‘‰ Ideal for multi-gas detection in safety and IoT systems.
🧠 Working Principle
  • Uses SnOβ‚‚ (Tin Dioxide) sensing material
  • Clean air β†’ low conductivity
  • Gas present β†’ conductivity increases
πŸ‘‰ Output changes as voltage depending on gas concentration
⚠️ Special Feature:
  • Dual heating cycle (similar to MQ-7):
    • πŸ”₯ High temperature β†’ detects methane & LPG
    • 🌑 Low temperature β†’ improves CO detection
πŸ“Š Infographic Summary
β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ πŸ”₯ MQ-9 GAS SENSOR β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ 🎯 Detects: CO, CHβ‚„, LPG β”‚
β”‚ ⚑ Voltage: 5V β”‚
β”‚ πŸ“ Range: 10–10,000 ppm β”‚
β”‚ πŸ”Œ Output: Analog + Digital β”‚
β”‚ πŸ” Dual heating cycle β”‚
β”‚ πŸ”₯ Multi-gas detection β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
πŸ”Œ Pin Configuration
β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ MQ-9 Module β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ VCC β†’ 5V
β”‚ GND β†’ Ground
β”‚ AO β†’ Analog
β”‚ DO β†’ Digital
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜
βš™οΈ Key Specifications
  • ⚑ Operating Voltage: 5V DC
  • πŸ“ Detection Range: 10 – 10,000 ppm
  • πŸ”Œ Output:
    • Analog (gas concentration)
    • Digital (threshold detection)
  • πŸ”₯ Heater Consumption: ~150 mA
  • 🌑 Operating Temperature: -10Β°C to 50Β°C
🌟 Key Features
  • πŸ”₯ Detects multiple gases
  • ⚑ Fast response time
  • πŸ”§ Easy to interface
  • 🎚 Adjustable sensitivity
  • πŸ’° Low cost
πŸ§ͺ Applications
  • 🏠 Gas leakage alarm systems
  • πŸš— Vehicle exhaust monitoring
  • 🏭 Industrial safety
  • πŸ€– IoT gas monitoring
  • πŸ”” Multi-gas alarm systems
πŸ”— Interfacing
Compatible with:
  • πŸ”΅ Arduino
  • πŸ“‘ ESP32 / ESP8266
  • πŸ“ Raspberry Pi
πŸ‘‰ Use:
  • AO β†’ measure gas level
  • DO β†’ trigger alarm
πŸ”„ Working Example
πŸ‘‰ Gas Leak Alarm:
  • Gas leaks detected
  • Sensor output rises
  • Microcontroller reads value
  • Buzzer/LED activates 🚨
⚠️ Important Notes
  • ⏳ Requires 24–48 hours preheating
  • ⚠️ Not highly selective (multiple gases trigger response)
  • ⚠️ Needs heater voltage cycling for accuracy
  • ⚠️ High power consumption
πŸ’¬ Practical insight:
MQ-9 is great for detection, not precise measurement
πŸ†š MQ-9 vs MQ-7 vs MQ-4
SensorBest For
MQ-4Methane (CNG)
MQ-7Carbon Monoxide
MQ-9Multi-gas (CO + LPG + CHβ‚„)
πŸ’‘ Pro Tip
  • Combine with buzzer + relay for automatic shutdown systems
  • Use in ventilation control systems
πŸ‘‰ Best choice when you need multi-gas detection in one module
Quantity
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