MQ-9 Carbon Monoxide and Combustible Gas Detector Sensor Module

The MQ-9 Carbon Monoxide and Combustible Gas Detector Sensor Module is a dual-cycle electrochemical sensing device engineered for advanced environmental safety tracking. Utilizing an internal micro-heater alongside a specialized SnO2 (Tin Dioxide) surface layer, this module cycles its temperature to detect Carbon Monoxide (CO) at low temperatures and LPG, Methane (CH4), or Propane at high temperatures. The onboard carrier electronics break out into a versatile dual-output interface: a 0-5V Analog Output (AO) for tracking exact gas concentration slopes and a TTL Digital Output (DO) driven by an LM393 comparator with an adjustable threshold potentiometer for direct binary trigger routing. Operating on a standard 5V supply, it is the premier choice for smart home fire safety nodes, industrial air quality monitors, and DIY ventilation automation systems using Arduino, ESP32, or Raspberry Pi.

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Product Details :

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Made In :	India

The MQ-9 Gas Sensor Module is a versatile gas detection module capable of sensing Carbon Monoxide (CO), Methane (CH₄), and LPG. It is widely used in safety systems and environmental monitoring applications. Featuring both analog and digital outputs, along with adjustable sensitivity, the MQ-9 module can be easily integrated with Arduino, ESP32, and other microcontrollers for real-time gas detection and alert systems.

Key Features

Detects CO (Carbon Monoxide), Methane, and LPG gases
Dual output: Analog (A0) and Digital (D0)
Adjustable sensitivity via onboard potentiometer
Fast response and high sensitivity
Onboard comparator (LM393) for digital output
LED indicators for power and detection
Easy interface with Arduino and IoT platforms

Technical Specifications

Parameter	Specification
Sensor Type	MQ-9 Gas Sensor
Detectable Gases	CO, CH₄ (Methane), LPG
Operating Voltage	5V DC
Output Type	Analog + Digital
Preheat Time	~20 seconds (recommended longer for stable readings)
Sensitivity	Adjustable
Interface	4-pin (VCC, GND, A0, D0)
Comparator IC	LM393