SparkFun
Alcohol Gas Sensor - MQ-3
The MQ-3 is an alcohol gas sensor suitable for detecting alcohol concentration in the air, similar to a breathalyser. It provides an analog resistive output ...
The MQ-3 is an alcohol gas sensor suitable for detecting alcohol concentration in the air, similar to a breathalyser. It provides an analog resistive output based on alcohol concentration, with high sensitivity and fast response time. The drive circuit is simple — just one resistor is needed, and the output can be read by a 0–3.3V ADC.
Key Features
- Alcohol Detection – High sensitivity to alcohol vapour concentration
- Analog Output – Resistive output proportional to gas concentration
- Simple Interface – Requires only one external resistor
- Operating Voltage – 5V DC or AC circuit
- Heater Consumption – Less than 750mW
- Operating Temperature – -10°C to 70°C
Specifications
- Diameter – 16.8mm
- Height – 9.3mm (without pins)
Ideal For
- Breathalyser projects
- Air quality monitoring
- Arduino and microcontroller gas detection projects
Package Contents
- 1× MQ-3 alcohol gas sensor
Resources
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.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
Find this product in
Brands
Guide
Datasheet · 448.1 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 607.3 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
