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 single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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