MQ-3 Smoke Sensor (ethanol)

🧪 MQ-3 Alcohol Gas Sensor Module – Overview

The MQ-3 is a high-sensitivity semiconductor gas sensor designed to detect alcohol vapors, primarily ethanol, in the air. It is widely used in applications such as breath alcohol testers, vehicle alcohol detection systems, and air quality monitoring devices. The sensor operates by measuring the change in resistance of its sensitive layer in the presence of alcohol vapors.

🔍 Key Features

• High Sensitivity to Alcohol: Specifically designed to detect ethanol vapors, making it ideal for breathalyzer applications.

• Dual Output: Provides both analog and digital outputs for flexible integration with microcontrollers.

• Adjustable Sensitivity: Features a built-in potentiometer to fine-tune the sensor's sensitivity.

• Fast Response Time: Offers quick detection of alcohol vapors, ensuring timely responses in safety-critical applications.

• Low Power Consumption: Operates at 5V with a current consumption of approximately 150mA.

• Long Lifespan: Designed for extended use with proper calibration.

⚙️ Technical Specifications

🛠️ Applications

• Breath Alcohol Testers: Detect alcohol concentration in exhaled breath.

• Vehicle Alcohol Detection Systems: Prevent vehicle operation if alcohol vapors are detected.

• Air Quality Monitoring Devices: Monitor ethanol levels in various environments.

• DIY Electronics Projects: Integrate into custom safety or monitoring systems.

🔌 Wiring Guide for Arduino Integration

1. VCC → 5V (Arduino)

2. GND → GND (Arduino)

3. A0 (Analog Output) → A0 (Arduino)

4. D0 (Digital Output) → Digital Pin (e.g., D2 on Arduino)

📚 Resources & Tutorials

• Datasheet: MQ-3 Sensor Datasheet

• Tutorial: Using MQ-3 with Arduino

• Video Guide: MQ-3 Gas Sensor Module Tutorial