MQ-3 High Sensitivity Alcohol Detector Sensor Module

MQ-3 High Sensitivity Alcohol Detector Sensor Module offers a reliable and highly sensitive solution for detecting the presence of ethyl alcohol vapor in the air. This robust sensor integrates the MQ-3 gas sensor with necessary signal conditioning circuitry onto a small, convenient module. The semiconductor material within the sensor exhibits decreased resistance when it encounters alcohol vapor, allowing the module to output a corresponding analog voltage. This high sensitivity makes it the perfect choice for quickly and affordably developing breathalyzers, drunk driving detection systems, and environmental safety monitors. Simply connect the module to a microcontroller like Arduino or Raspberry Pi, and you can start monitoring alcohol levels with ease.

Key Features:

• High Sensitivity: Detects alcohol vapor concentrations accurately over a wide range (300 to 10,000 ppm).
• Fast Response Time: Provides quick detection and recovery, enabling rapid, repeated measurements.
• Dual Output: Features both a digital (TTL) output for threshold detection and an analog output for precise concentration readings.
• Adjustable Threshold: Includes an onboard potentiometer, allowing users to easily set the digital output trigger point.
• Stable and Long Life: The sensor’s robust construction ensures reliable long-term operation.

Technical Specifications:

• Sensor Type: Semiconductor Gas Sensor (SnO₂)
• Detection Gas: Alcohol (Ethanol)
• Concentration Range: 300 – 10,000 ppm (parts per million)
• Operating Voltage (V_CC): 5V DC
• Heater Voltage (V_H): 5V ± 0.1V AC or DC
• Output Signal: Analog (0V to V_CC) and Digital (TTL)
• Power Consumption: ≈ 150 mA

Mechanical Specifications:

• Module Type: PCB with onboard circuitry (resistor, capacitor, potentiometer, LED indicator).
• Pin Type: 4 or 5 Pin Male Header (0.1 inch spacing).
• Mounting: Two mounting holes for secure attachment to a chassis or enclosure.

Dimensions:

• Module Size: Typically 32 mm x 22 mm
• Sensor Diameter: ≈ 16 mm
• Weight: ≈ 8 g

Pinout and Wiring:

• V_CC: Connect to the 5V power supply.
• GND: Connect to the circuit ground.
• DO (Digital Out): Provides a high/low signal based on the preset threshold (adjustable via potentiometer).
• AO (Analog Out): Outputs a variable analog voltage directly proportional to the alcohol concentration.
• Wiring Note: Connect V_CC and GND to power the module. Use the AO pin to connect to an ADC pin on your microcontroller for precise readings.

Datasheet Reference:

• Download MQ-3 Gas Sensor Datasheet

Commonly Used in:

• Hobby Electronics: Building DIY safety projects and environmental monitors.
• Educational Labs: Demonstrating gas sensing and concentration measurement principles.
• Automotive Projects: Creating simple vehicle interlock or safety systems.

Applications:

• Personal Breathalyzers: Building low-cost devices to estimate blood alcohol content.
• Factory Alcohol Leak Detection: Monitoring fermentation tanks or industrial ethanol storage areas.
• Fire and Safety Alarms: Used in conjunction with other sensors to detect specific environmental hazards.

Equivalent Models:

• MQ-9: Detects carbon monoxide and flammable gas, offering broader general air quality detection.
• MQ-135: A module for detecting general air quality, including harmful gases like NH₃, NO_x, and CO₂.

Package Includes:

• 1 x MQ-3 High Sensitivity Alcohol Detector Sensor Module