Gravity: Analog Alcohol Sensor (MQ3)

DFRobot Arduino Alcohol Sensor (MQ3) is a gas detection module designed for measuring alcohol concentration in air using the proven MQ‑3 sensing element. This analog gas sensing board provides strong sensitivity to ethanol vapors while maintaining lower response to benzine and other interfering gases, making the module suitable for breath analysis prototypes and alcohol detection systems. Designed for seamless integration with Arduino development environments, the sensing unit outputs an analog voltage proportional to alcohol concentration, enabling straightforward data acquisition for embedded projects, safety monitoring systems, and experimental gas‑sensing applications.

MQ‑3 Alcohol Detection with Selective Sensitivity

An MQ‑3 gas probe forms the sensing core of this alcohol detection module. The sensing element responds strongly to ethanol vapor commonly present in breath analysis scenarios while maintaining significantly lower sensitivity to benzine. Such selectivity improves reliability in alcohol monitoring projects and breathalyzer prototypes. Fast response behavior and stable long‑term operation allow consistent detection of changing alcohol concentrations, supporting embedded sensing applications requiring repeatable analog gas measurements.

Adjustable Sensitivity with Analog Signal Output

An onboard potentiometer enables flexible sensitivity calibration to match different alcohol concentration ranges and environmental conditions. Gas density variations translate into proportional analog voltage output, allowing direct analog signal acquisition through microcontroller ADC inputs. Such behavior simplifies firmware development for gas monitoring algorithms and threshold detection systems while maintaining compatibility with common embedded platforms and experimental sensing circuits.

Gravity Interface for Plug‑and‑Play Integration

A Gravity interface design simplifies hardware integration by providing standardized connectors for rapid sensor deployment. Direct compatibility with the Arduino IO expansion shield allows quick connection to Arduino microcontrollers without complex wiring. Clearly labeled analog and digital interface markings, combined with a robust connector and immersion‑gold PCB finish, ensure reliable electrical contact and convenient prototyping for electronics labs, robotics systems, and educational experimentation.

Alcohol sensing modules based on MQ‑series technology are widely applied in breathalyzer prototypes, laboratory gas detection experiments, safety monitoring devices, and embedded sensing demonstrations. Reliable analog output and simple integration make this gravity‑series alcohol detection board suitable for maker projects, embedded system development, and STEM education environments exploring practical gas sensing technology.