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Winsen

Winsen MQ303B Alcohol Gas Sensor Module

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Gas Sensors for everyday users

The Winsen MQ303B Alcohol Gas Sensor Module by Winsen is a value-for-money gas sensors designed for everyday users. It features Item Type: Gas Sensor and Model No. / Name: MQ303B.

₹654
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Total: ₹654
Buying tip: A smart budget buy — solid performance without breaking the bank.
Estimated delivery: 24 Aug7 Sept
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Quick Specs

Item Type: Gas Sensor
Model No. / Name: MQ303B
Sensor Type: Semiconductor
Standard Encapsulation: Metal
Target Gases: Alcohol
Detecting Range: 20~ 500ppm alcohol

Ideal For

Electronics projectsArduino / Raspberry Pi buildsPrototyping
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SKU: robu-938348Category: Gas Sensors

About This Product

The Winsen MQ303B Alcohol Gas Sensor Module by Winsen is a value-for-money gas sensors designed for everyday users. It delivers reliable performance at an accessible price.

Key Specifications

  • Item Type: Gas Sensor
  • Model No. / Name: MQ303B
  • Sensor Type: Semiconductor
  • Standard Encapsulation: Metal
  • Target Gases: Alcohol
  • Detecting Range: 20~ 500ppm alcohol — reliable connection even at a distance
  • Load Resistance: Adjustable
  • Heater Voltage: ≤6V DC — works with standard household power

Why Buy from Elecvora?

Elecvora sources this product directly, cutting out multiple middlemen. Every order includes free shipping, a 15-day return policy, and secure payment via Razorpay.

Winsen Semiconductor Type Alcohol Sensor is an original and brand new mini size alcohol sensor for gift-type breathalyzer use.

The sensitive material of the MQ303B gas sensor is a semiconductor material which is with lower conductivity in clean air. When the target alcohol gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.

Semiconductor Type Alcohol Sensor has a high sensitivity to Alcohol gas. It is a kind of low-cost sensor for kinds of applications and also a mini size gift-type Alcohol sensor breathalyzer.

Applications :
It has a high sensitivity to alcohol and quick response and resume, widely used in portable alcohol gas detectors.

Features:

  1. Responsive to Alcohol gas
  2. Compatible with 5V
  3. Cost-efficient

Package Includes:

1 x Winsen Semiconductor Type Alcohol Sensor

Setup Guide

1
Identify the pins
Locate VCC (power), GND (ground), and data pins (SDA/SCL for I2C, MOSI/MISO for SPI, or TX/RX for UART). Refer to the pinout diagram on the product page.
2
Wire to your microcontroller
Connect VCC to 3.3V or 5V (check the module spec), GND to GND, and data pins to the appropriate GPIO pins on your Arduino or Raspberry Pi.
3
Install libraries
In Arduino IDE, go to Sketch → Include Library → Manage Libraries and search for the sensor library. Install the recommended version.
4
Upload example sketch
Open File → Examples → [library name] → Basic Example. Upload to your board and open Serial Monitor to view output.
5
Calibrate if needed
Some sensors (temperature, humidity, distance) may need a short warm-up period or calibration. Run the calibration sketch if provided.