MQ-9 CO, Methane & LPG Gas Sensor Module - 5V DC, Analog & Digital Output
The MQ-9 is a semiconductor gas sensor module designed for detecting Carbon Monoxide (CO), Methane (CH4), Propane, and other combustible gases. It operates on a 5V DC supply and provides both analog (AO) and digital (DO) TTL output signals, making it compatible with microcontrollers like Arduino, Raspberry Pi, and ESP32 for air quality monitoring and safety applications.
Features
- Semiconductor sensor with SnO2 sensing element for CO and combustible gases.
- Dual-temperature cycle operation: low temp (1.5V heat) for CO, high temp (5.0V heat) for Methane/Propane.
- Provides both analog voltage (AO) and digital TTL (DO) output signals for flexible interfacing.
- Simple 5V DC drive circuit with a current consumption of approximately 150mA.
- Compact PCB module format for easy integration into detectors and monitoring systems.
Out of stock
The MQ-9 gas sensor module utilizes a tin dioxide (SnO2) semiconductor sensing element whose conductivity changes in the presence of target gases. It employs a dual-temperature heating cycle to differentiate gas types: a lower temperature phase (heated by 1.5V) optimizes sensitivity to Carbon Monoxide, while a higher temperature phase (heated by 5.0V) detects Methane, Propane, and other combustible gases while cleaning the sensor surface.
The module includes onboard signal conditioning to provide a stable analog output voltage (AO) proportional to gas concentration, as well as a digital output (DO) that switches from a TTL high to low state when a preset threshold is exceeded. This design allows for direct connection to ADC inputs or digital pins on most development boards and industrial controllers.
Additional Information
| Weight | 0.005 kg |
|---|---|
| Dimensions | 3.2 × 2 cm |
