Pololu
Alcohol Gas Sensor MQ-3
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The MQ-3 is a semiconductor gas sensor that detects alcohol vapour at concentrations from 0.04 mg/L to 4 mg/L — a range suitable for building a breathalyser....
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The MQ-3 is a semiconductor gas sensor that detects alcohol vapour at concentrations from 0.04 mg/L to 4 mg/L — a range suitable for building a breathalyser. It provides a simple analog voltage output that requires only one analog input pin from your microcontroller.
Key Features
- Alcohol Detection Range – 0.04 to 4 mg/L
- Analog Output – Simple voltage interface, one ADC pin required
- High Sensitivity – Suitable for breathalyser applications
Ideal For
- Breathalyser projects
- Air quality and gas detection
- Arduino and microcontroller sensor projects
Package Contents
- 1× MQ-3 alcohol gas sensor
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
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