Detailed Description:
Monitor the presence of alcohol vapors in the air with the MQ-3 Alcohol Detector Sensor Module, a highly sensitive and reliable component for your electronics projects. This module is specifically designed to detect alcohol (ethanol) and is widely used in applications such as breathalyzers, vehicle alcohol detectors, and industrial safety systems. The sensor works on the principle of a tin dioxide (SnO2) semiconductor, which intelligently adjusts its electrical conductivity when exposed to alcohol, providing a stable and accurate measurement of the gas concentration.
The versatility of the MQ-3 module is a key feature, as it offers both analog (AO) and digital (DO) outputs. For projects that require precise measurements, the analog output provides a continuous voltage signal that is directly proportional to the alcohol concentration, allowing you to log real-time data or display values on an LCD screen. For simpler applications, the digital output provides a straightforward HIGH/LOW signal. You can easily adjust the sensitivity of this digital trigger point using the on-board potentiometer, making it simple to create a threshold-based alarm system that activates a buzzer or LED when a certain level of alcohol is detected.
Operating on a standard 5V DC supply, the MQ-3 module is fully compatible with popular microcontrollers like Arduino, ESP32, and Raspberry Pi. It is an ideal component for a wide range of educational and DIY projects, including drunk driving prevention systems and home automation. With its high sensitivity, fast response time, and low cost, the MQ-3 Alcohol Detector Sensor Module is an essential component for any electronics project, that requires reliable and accurate alcohol sensing.
The MQ-3 Sensor Module is based on the MQ3 gas sensing element, specially designed to detect alcohol vapor in the air, with high sensitivity and fast response. It can detect alcohol concentrations from 25 to 500 ppm, making it ideal for breath analysis systems, smart vehicle safety, and alcohol testing devices.
The module provides both analog output (A0) for concentration-level readings and digital output (D0) with a preset threshold via an onboard potentiometer. It is widely used in breathalyzers, drunk driving prevention systems, and alcohol leak detectors.
Key Features:
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Detects alcohol, ethanol, and benzine vapors
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High sensitivity and fast response time
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Dual output: Analog (A0) and Digital (D0)
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Built-in sensitivity adjustment potentiometer
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Compatible with Arduino, ESP32, Raspberry Pi, STM32
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Ideal for breathalyzer and vehicle safety systems
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Compact, easy to interface, and low power design
Technical Specifications:
| Parameter |
Specification |
| Detectable Gases |
Alcohol, Ethanol, Benzine Vapors |
| Concentration Range |
25 – 500 ppm |
| Operating Voltage |
5V DC |
| Output Signals |
Analog (A0), Digital (D0) |
| Heater Resistance |
~33Ω ±5% |
| Response Time |
<10 seconds |
| Preheat Time |
~20 seconds to 2 minutes (for stable readings) |
| Operating Temperature |
-10°C to 50°C |
| Dimensions |
~32mm x 20mm x 15mm |
How to Use:
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Connect VCC to 5V, GND to Ground, A0 to Analog Pin, and D0 to Digital Pin of Arduino or ESP32.
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Allow the sensor to preheat for ~2 minutes.
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Use analogRead() to get gas concentration or digitalRead() for threshold detection.
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Adjust the potentiometer to set the digital output trigger level.
Applications:
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Breathalyzer/alcohol detection systems
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Smart car driver alcohol monitoring
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Alcohol detection in factories/labs
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IoT-based personal health gadgets
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Alcohol leak detectors in storage rooms
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Educational projects and STEM kits
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Access control systems with alcohol checks
Package Includes:
