The MQ-5 Gas Sensor Module provides reliable and cost-effective detection of LPG, natural gas, hydrogen, and other combustible gases across a wide concentration range. It combines the MQ-5 semiconductor sensing element with an onboard LM393 comparator and sensitivity adjustment potentiometer, delivering both analog and digital outputs for versatile integration.
The Analog Output (AO) generates a voltage proportional to the detected gas concentration, making it suitable for data logging, real-time monitoring, or quantitative analysis. The Digital Output (DO) activates when gas levels exceed the user-set threshold, enabling direct interfacing with alarms, relays, or microcontrollers for immediate response.
Designed for a standard 5V power supply, this module ensures straightforward compatibility with microcontrollers like Arduino, ESP32, and Raspberry Pi. Built-in LEDs simplify debugging and calibration by indicating both power status and detection activity. Its 4-pin interface makes integration simple for students, hobbyists, and professionals alike. From home leak alarms and factory safety systems to IoT projects, the MQ-5 sensor module delivers accuracy, long sensor life, and ease of use in a compact package.
Key Features
Detects LPG, natural gas, hydrogen, and other flammable gases
Dual outputs: Analog (AO) and Digital (DO)
Adjustable sensitivity via onboard potentiometer
Operates at 5V—ideal for microcontroller use
Onboard power and status indicator LEDs
Compact, breadboard-friendly module
Product Specifications
| Specification | Details |
|---|---|
| Operating Voltage | 5 V DC |
| Sensor Type | MQ-5 Semiconductor Gas Sensor |
| Comparator | LM393 |
| Detection Range | 200 – 10,000 ppm (LPG / Natural Gas / Hydrogen) |
| Heater Resistance | ~31 Ω ± 3 Ω (at room temperature) |
| Heating Power | ≤ 900 mW ‘ |
| Analog Output | Continuous voltage proportional to gas level |
| Digital Output | High/Low signal at threshold exceedance |
| Sensitivity Control | Adjustable via potentiometer |
| Typical Current Draw | ~150 mA |
| Module Size | Compact, easy integration |
Pin Configuration
| Pin | Label | Description |
|---|---|---|
| 1 | AO | Analog voltage output (gas concentration) |
| 2 | DO | Digital output (HIGH when gas exceeds threshold) |
| 3 | GND | Ground |
| 4 | VCC | +5V Power Supply |
Applications
LPG and natural gas leak detection systems
Factory and industrial safety monitoring
Smart home gas alarm systems
IoT-based air quality and safety devices
Educational electronics and sensor learning kits
