DFRobot
Gravity: Arduino Alcohol Sensor (MQ3)
An analogue alcohol gas sensor based on the MQ-3 probe, designed for use with Arduino and other microcontrollers. The sensor outputs a voltage proportional t...
An analogue alcohol gas sensor based on the MQ-3 probe, designed for use with Arduino and other microcontrollers. The sensor outputs a voltage proportional to the concentration of alcohol vapour in the surrounding air, making it suitable for breathalyser-style projects, air quality monitoring, and gas detection experiments.
Part of the DFRobot Gravity sensor range, this module features a plug-and-play 3-pin analogue interface and an onboard potentiometer for adjusting sensitivity. The MQ-3 probe has high sensitivity to alcohol with low cross-sensitivity to benzene.
Key Features
- MQ-3 Gas Sensor Probe – High sensitivity to alcohol vapour
- Analogue Output – Voltage proportional to gas concentration
- Adjustable Sensitivity – Onboard potentiometer for calibration
- Gravity Interface – 3-pin analogue connector for plug-and-play wiring
- Immersion Gold Surface – Improved oxidation resistance
- Standard Mounting – Four 3mm holes at 5mm spacing
- Fast Response – Quick detection with stable, long-life operation
Ideal For
- DIY breathalyser and alcohol detection projects
- Air quality monitoring systems
- Arduino gas sensing experiments
- STEM education and sensor exploration
Specifications
- Sensor – MQ-3 alcohol gas probe
- Power Supply – 5V
- Interface – Analogue
- Dimensions – 36.4 × 26.6mm
Package Contents
- 1× Gravity Alcohol Sensor (MQ-3)
- 1× Analogue Sensor Cable
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- potentiometer
- A variable resistor usually turned with a knob or shaft to create an adjustable electrical signal. It is often used for inputs such as volume, brightness or position, so it helps beginners learn how a microcontroller reads changing values.
Find this product in
Brands
Supplier page — dfrobot.com
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Related Tutorials
Free guides on learn.littlebird.com.au
