MQ-5 Gas Sensor Module for Arduino and DIY Projects
= Semiconductor Gas Detection Sensor for LPG, Methane, and Propane =
The MQ5 gas sensor module is a costeffective, low-power gas detection device ideal for home and industrial safety applications . It is highly sensitive to butane, propane, and methane, making it a popular choice for gas leakage alarms and monitoring systems . The sensor uses tin dioxide (SnO2), which has low conductivity in clean air, but increases as combustible gas concentrations rise .
Reliable Gas Detection - Sensitive to LPG, methane, and propane with fast response times
Dual Output Modes - Provides both analog (AO) and digital (DO) output signals
Operating voltage is 5V DC with a heating element that requires a preheat time for accurate readings
Use the on-board potentiometer to adjust the digital output threshold sensitivity
The sensor requires up to 24 hours of preheating for optimal stabilization after power-on
= Technical Specifications =
| Parameter | Value |
|---|
| Target Gases | LPG, Methane, Propane, Butane |
| Detection Range | 200-10000 ppm |
| Operating Voltage | 5V DC |
| Heater Resistance | 31Ω ±10% |
| Output Types | Analog (AO) & Digital (DO) |
| Dimensions | 40x21mm |
= Key Features =
High Sensitivity - Responds to LPG, methane, and propane at low concentrations
Simple Interface - AO provides voltage proportional to gas concentration; DO triggers at a set threshold
Adjustable Sensitivity - The potentiometer sets the digital output threshold
Low Cost A budgetfriendly solution for gas detection projects
== Applications ==
- Domestic LPG leak detection and kitchen safety systems
- Laboratory gas monitoring and industrial safety
- IoT-based air quality monitoring projects
- Automatic gas valve shutoff systems
Reliable Safety Component - Widely used in gas leak detection systems with Arduino
Versatile Output Options - Analog signal for variable gas concentration or digital for simple alarm triggering
√ Compatible with Arduino Uno, ESP32, and other 5V logic microcontrollers
√ Includes mounting holes for easy installation in DIY projects
√ On-board power and signal indicators
= Troubleshooting =
No output:
- Ensure the preheating time is sufficient
- Verify stable 5V power supply
Inconsistent readings:
- Allow sensor to stabilize after power-on
- Avoid exposing to contaminants such as alcohol or smoke, which can affect readings
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