MQ-9 Carbon Monoxide (CO) Gas Sensor Module

The MQ-9 Carbon Monoxide Gas Sensor Module is a reliable, high-sensitivity electronics component designed to detect the presence of carbon monoxide (CO) in ambient air. Suitable for both electronics engineers and hobbyists, this module is ideal for safety monitoring, air quality assessment, and environmental surveillance, as well as prototyping with Arduino, Raspberry Pi, and other microcontroller-based systems.

Key Features ⚙️

• 🎯 High sensitivity to carbon monoxide for dependable detection
• 🛡️ Stable performance with an extended service life
• 🔧 Simple drive circuit with an adjustable load resistor
• ⏱️ Fast response time for timely measurements
• 📦 Compact and cost-effective module for easy integration

Technical Specifications 📐

• Operating Voltage: 5 V
• Detection Range: 10–1000 ppm (Carbon Monoxide)
• Heating Resistance: 31 Ω ± 3 Ω
• Heating Current: ≤ 180 mA
• Load Resistance: Adjustable
• Heating Voltage: 5.0 V ± 0.2 V / 1.5 V ± 0.2 V (dual-level heater drive)

Integration & Compatibility 🔌

• Works seamlessly with Arduino, Raspberry Pi (via an external ADC), ESP32, and other microcontroller platforms.
• Provides an analog voltage output via a voltage divider using the adjustable load resistor—ideal for interfacing with ADC inputs.
• Ensure the power supply can deliver the heater current (≤ 180 mA) and follow the specified heater voltage levels for proper operation.
• For best accuracy, allow sensor preheating and perform calibration as described in the datasheet.

Typical Applications 🧰

• Residential and industrial carbon monoxide detectors
• Fire alarm systems
• Environmental monitoring and surveillance systems
• Air quality assessment modules and instruments

For more detailed information, please refer to the Datasheet (calibration procedures, heater cycling, and recommended circuits).