Seeed Studio Studio Grove MQ3 Alcohol Gas Sensor Module - Analog Output

Name: Seeed Studio Studio Grove MQ3 Alcohol Gas Sensor Module - Analog Output
Brand: Seeed Studio
SKU: SENS-0938
Price: 2089.00 INR
Availability: OutOfStock

₹2,089.00 (Inclusive of all taxes)

Out of Stock

The Seeed Studio Studio Grove MQ3 is an electrochemical alcohol gas sensor module designed for easy integration with Arduino, Raspberry Pi, and other 3.3V/5V microcontroller platforms via its analog output interface. It provides a reliable solution for detecting alcohol vapor, LPG, benzene, and other combustible gases.

Features

Electrochemical MQ3 sensor with high sensitivity to alcohol vapor
Wide operating voltage range from 3.3V to 5V DC
Analog voltage output for direct ADC connection
On-board potentiometer for sensitivity adjustment
Pre-wired with a 50cm Grove cable for plug-and-play connectivity

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Description

The Grove MQ3 module utilizes a metal-oxide-semiconductor (MOS) electrochemical sensing element. When exposed to target gases like alcohol, the sensor’s conductivity changes proportionally to the gas concentration, which is then converted into an analog voltage signal. This signal can be read directly by a microcontroller’s ADC pin for threshold detection or trend monitoring.

Designed for stability and a long operational life, the module includes a simple conditioning circuit and a potentiometer for calibrating the sensor’s response threshold. It is important to note that the output provides a relative indication of gas presence and trend, not a precise PPM concentration measurement, making it ideal for qualitative detection applications.

Key Features

High-sensitivity MQ3 electrochemical gas sensor element
Optimized for alcohol detection with secondary sensitivity to LPG, benzene, and hexane
Fast response time for immediate leak or presence detection
Stable long-life sensor construction with simple drive circuitry
Standard 4-pin Grove connector system for rapid prototyping
Compact form factor ideal for embedded and portable designs
High-value build suitable for educational and industrial proof-of-concept projects

Applications

Portable breathalyzer and alcohol detection devices
Industrial safety systems for alcohol vapor leak monitoring
Smart home air quality monitors for combustible gas detection
Educational kits for environmental sensing and IoT projects
Toys and gadgets requiring simple gas presence feedback

Technical Specifications

Sensor Model	MQ3
Operating Voltage	3.3V - 5V DC
Output Signal	Analog Voltage
Interface	Grove Analog (4-pin)
Primary Detection Gases	Alcohol, LPG, Benzene, CH4, Hexane, CO
Dimensions (L x W)	40mm x 20mm
Module Weight	12g
Cable Length	50cm

Frequently Asked Questions

What is the operating voltage range for the Grove MQ3 module?

The module operates from a 3.3V to 5V DC power supply, making it directly compatible with most common microcontroller boards like Arduino (5V) and Raspberry Pi/ESP32 (3.3V) without requiring level shifting.

How do I connect and read data from this sensor?

Connect the module's 4-pin Grove cable to an analog Grove port or directly to your microcontroller: VCC to 3.3V/5V, GND to ground, and the SIG pin to an ADC input. The output is an analog voltage that increases with gas concentration, which you can read using the analogRead() function.

Can this sensor provide exact alcohol concentration in PPM?

No. The MQ3 provides an analog voltage that correlates with the relative concentration of target gases. It is excellent for detecting presence, leaks, or trends, but it is not a precision instrument for exact PPM measurement without extensive calibration in a controlled environment.

How do I calibrate or adjust the sensor sensitivity?

The module includes a blue potentiometer. Rotating it adjusts the sensor's baseline signal level. For calibration, expose the sensor to clean air, measure the output, then adjust the pot until the reading is at your desired baseline threshold before introducing the target gas.