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MQ-3 Alcohol Detector Sensor Module front view showing MQ-3 sensing element and analog digital pins

MQ3 sensor module back view showing PCB potentiometer and 5V power input pin header labels

MQ-3 Alcohol Detector Sensor Module

Name: Buy MQ-3 Alcohol Detector Sensor Module at Best Price Online
SKU: SEN-GS008
Price: 120.00 INR
Availability: InStock

SKU: SEN-GS008

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Key Highlights

Detects ethanol and alcohol vapor in the surrounding air reliably
Operates at 5V DC and draws 150mA current from a standard Arduino supply
Load resistance of 200 kΩ sets the sensor sensitivity threshold on the module
Compact body fits easily inside project enclosures

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Description

The MQ-3 Alcohol Detector Sensor Module detects ethanol (alcohol vapor in the surrounding air) using a tin oxide (SnO2) sensing element (a material that changes electrical resistance when it absorbs target gas molecules). The mq3 sensor runs on 5V DC at 150mA and outputs both an analog voltage and a digital threshold signal. The module dimensions are 36 x 20 x 16 mm, which fits neatly inside small project enclosures.

The mq3 gas sensor module requires a warm-up period (a heating phase where the internal coil reaches operating temperature) before accurate readings are possible. One non-obvious detail — cold startup can take 24 to 48 hours of first-use burn-in before the sensor readings stabilise to consistent levels.

The MQ-3 also responds to benzene, hexane, and LPG vapour at high concentrations, so it is not suitable for precise gas identification. Students building breathalyser projects and alcohol detection systems use it. To start, connect, and read the analog pin after a 60-second warm-up. StemVolt provides this sensor with trusted quality, ensuring reliable performance and easy usability.

Related Products:

Checkout The MQ-4 CNG Methane Natural Gas Sensor Module

Features:

Operating voltage at 5V DC connects directly to Arduino and ESP32 supply pins without any regulator
Current consumption at 150mA requires a dedicated 5V supply rather than drawing from Arduino 3.3V pin
Load resistance at 200 kΩ sets the baseline sensitivity for alcohol vapour concentration thresholds
Detectable gases include ethanol and alcohol vapor giving the module its primary breath alcohol sensing use

Technical specifications:

Specification	Details
Sensor Type	MQ-3 Sensor Module
Detectable Gases	Ethanol and Alcohol Vapor
Operating Voltage	5V DC
Current Consumption	150mA
Load Resistance	200 kΩ
Dimensions (L x W x H)	36 x 20 x 16 mm

Applications:

Breathalyser project uses this sensor to detect alcohol on a person’s breath and display a result
mq3 gas sensor module reads analog vapour level and sends a real-time alert to a over Wi-Fi
Factory safety monitor reads ethanol level above a set threshold and activates a ventilation fan relay

Package includes:

1 x MQ-3 Alcohol Detector Sensor Module

Frequently Asked Questions

How long does the MQ-3 Alcohol Detector Sensor Module need to warm up before accurate readings?
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Allow at least 60 seconds after powering on for stable readings in normal use. For a brand-new MQ-3 sensor, a 24 to 48 hour burn-in period gives the most consistent long-term baseline.

Can the MQ-3 gas sensor detect gases other than alcohol?
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Yes. The MQ-3 also responds to benzene, hexane, and LPG vapour at high concentrations. It works well for alcohol detection projects but cannot precisely identify individual gas types.

What output pins does the MQ-3 Alcohol Detector Sensor Module provide?
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The module gives both an analog output pin and a digital output pin. The analog pin gives a proportional voltage reading, while the digital pin switches HIGH or LOW based on a preset threshold.

How do I connect the MQ-3 sensor module to an Arduino?
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Connect VCC to 5V, GND to GND, the analog output to an Arduino analog pin, and the digital output to a digital pin. Read the analog value after a 60-second warm-up period in your sketch.

Is the MQ-3 Alcohol Detector Sensor Module suitable for a vehicle ignition lock project?
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Yes. Read the analog output above a set threshold value and use a relay module to interrupt the ignition circuit. Always calibrate the detection level carefully before using it in a safety application.

1. How long does delivery take?

Most orders are delivered within 3–7 working days, depending on your location. Remote areas may take slightly longer, but we always aim for fast and reliable delivery.

2. What should I do if I receive a damaged product?

If you receive a damaged or defective product, please contact us within 24 hours and share an unboxing video. Our team will quickly verify and arrange a replacement.

3. Do you provide technical support for products?

Yes, STEMVOLT provides basic technical support for most DIY kits, sensors, and electronic components to help you use the product smoothly and without confusion.

4. Is payment on STEMVOLT secure?

Yes, all payments on STEMVOLT are processed through secure and encrypted payment gateways. Your personal and payment information remains completely safe and protected at all times.