The sensor determines the concentration of alcohol in the air, the result can be obtained measuring the voltage on the analog output. The system is powered with the voltage from 2.5 V to 5 V. It has a digital and analog output, making it compatible with mostof the commissioning modules including Raspberry Pi and Arduino.
The digital output D0
With the help of placed on the reverse side of the board, potentiometer, set is the threshold, exceeding of which, causes the output D0 changing from a high to a low status. The pin D0 can be linked directly with a microcontroller or commissioning set, including Arduino, or for example, a module with a buzzer, which will signal a too low or too high level of alcohol in the air.
Analog output A0
The sensor has an analog output A0, which must be connected to the pin of the converter A/D (analog input in Arduino). This will allow you to measure the proportional voltage signal and more accurately determine the level of alcohol.
Operating principle:
MQ-3 gas sensor applies SnO2 which has a lower conductivity in the clear air as a gas-sensing material. In an atmosphere where there may be alcohol gas, the conductivity of the gas sensor raises along with the concentration of the alcohol gas increases.
Features:
- Sensitive for alcohol, ethanol
- Output voltage boosts along with the concentration of the measured gases increases
- Fast response and recovery
- Adjustable sensitivity
- Signal output indicator
Specification:
- Power supply: from 2.5 V to 5 V
- Analog and digital output
- Pins: goldpin connectors, 2.54 mm pitch
- Board sizes: 40 x 21 mm
- It has mounting holes with the diameter: 2 mm
Package Includes:
1 x MQ-3 Gas Sensor
1 x 4-pin custom connector jumper wire
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Read More →Technical Specifications
| Brand | WAVESHARE |
|---|---|
| Model | MQ-3 |
| SKU | AI2069 |
| Weight | 0.01 kg |
| Availability | In Stock |
Applications & Use Cases
The Waveshare MQ-3 Gas Sensor is a versatile gas and dust sensor used across a wide range of applications including air quality monitoring, gas leak detection, industrial safety, HVAC systems, and environmental monitoring.
Common use cases:
- Building a gas leak alarm for LPG/methane
- Monitoring indoor air quality (CO2, VOC)
- Dust monitoring in a workshop
This product is ideal for environmental engineers, safety professionals, and IoT developers.
Technical Tip: MQ-series sensors need a warm-up period (24-48 hours for first use). Calibrate in clean air for accurate readings.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
- Genuine WAVESHARE product sourced from authorized channels
