MQ9 Carbon Monoxide Gas Sensor Module 2024 Reliable gas sensing module for DIY electronics and prototype projects Why this module matters Detects carbon monoxide and combustible gases with a metal oxide semiconductor sensor element, providing a clear electrical signal for monitoring and control tasks. Simplifies prototyping and product development by delivering both analog and digital outputs for easy integration with microcontrollers and single board computers. Compact, readytouse PCB module allows quick mounting on breadboards or inside custom enclosures, saving development time. Key benefits and problem solving Fast, repeatable detection: the sensor provides a rapid electrical response to changes in gas concentration, helping you capture events and log data reliably. Flexible interfacing: analog output enables precise measurements and calibration, while the onboard digital comparator output offers an adjustable threshold for onoff alarm or control functions. Easy to integrate: compatible with development platforms for hobby and industrial prototyping, reducing wiring and programming effort. Main features and specifications Function: Carbon monoxide and combustible gas sensing using MQ9 sensing element. Outputs: Analog output for gas concentration monitoring and digital output through adjustable comparator for thresholdbased switching. Interface: Standard module pins for power and signal connections to microcontrollers and data acquisition systems. Operating supply: Designed for typical 5V module power rails used in hobby electronics. Form factor and material: Compact PCB module with metal oxide semiconductor sensor housed on the board for durable prototyping use. Adjustability: Onboard potentiometer for setting digital output sensitivity to suit specific applications. Integration notes Recommended for use with microcontrollers such as Arduino and compatible single board computers such as Raspberry Pi for data logging, display, or control. Allow recommended preheat time for stable baseline readings when powering up the sensor module. Calibrate analog readings in your system environment for reliable threshold settings and measurement consistency. Practical applications Home DIY monitoring and logging: integrate into a hobby project to record gas levels and visualize trends with minimal wiring and code. Workshop and garage detection prototype: connect to a microcontroller and a relay or alarm to prototype an alert system for fuel or vehicle exhaust testing. Educational and laboratory experiments: use for sensor labs, electronics courses, and rapid prototyping where both analog measurement and digital switching are needed. What you receive One MQ9 gas sensor module ready for integration into DIY electronics projects and prototypes.