MQ-3 Alcohol Gas Sensor Module

Description

MQ-3 Alcohol Gas Sensor Module This module is made using Alcohol Gas Sensor MQ3. It is a low cost semiconductor sensor which can detect the presence of alcohol gases at concentrations from 0.05 mg/L to 10 mg/L. The sensitive material used for this sensor is SnO 2 , whose conductivity is lower in clean air. It’s conductivity increases as the concentration of alcohol gases increases. It has high sensitivity to alcohol and has a good resistance to disturbances due to smoke, vapor and gasoline. This module provides both digital and analog outputs. Threshold level for digital output can be easily adjusted using the preset on the board. MQ3 alcohol sensor module can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc. Features High sensitivity to alcohol vapors. Detects alcohol concentrations ranging from 0.05 to 10mg/L. Provides both analog and digital output signals. Fast response and recovery times for timely detection. Simple drive circuit for easy implementation. Long service life with stable performance. Adjustable sensitivity via onboard potentiometer. Compact design suitable for various applications. Specifications Parameter Value Sensor Type Semiconductor (SnO₂) Target Gas Alcohol vapor Detection Range 0.05–10mg/L Operating Voltage 5VDC Heater Voltage (VH) 5.0V±0.1V AC or DC Load Resistance (RL) Adjustable Heater Resistance (RH) 31Ω±3Ω (Room Temp) Heater Consumption ≤900mW Sensitivity (S) Rs(in air)/Rs(0.4mg/L alcohol) ≥5 Preheat Time ≥24 hours Operating Temperature -10°C to 50°C Operating Humidity ≤95% RH Dimensions 35mm x 22mm x 30mm PINOUT VCC – Input Power Supply GND – Supply Ground DO – Digital Output AO – Analog Output Applications Breathalyzer devices for personal or professional use. Alcohol detection systems in vehicles. Industrial safety equipment for monitoring alcohol vapors. Integration into microcontroller-based projects for alcohol monitoring. Educational projects and laboratory experiments involving gas detection. Package Contents 1x MQ-3 Alcohol Gas Sensor Module. Documents MQ-3 Alcohol Sensor Datasheet . MQ-3 Module Manual .

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