SMART Notebook 10, Руководство пользователя

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9 | P a g e
Description of Design Components
MQ3 Gas Sensor
The MQ3 gas sensor is alcohol sensor which is used to detect the alcohol concentration on your
breath. This sensor provides an analog resistive output based on alcohol concentration. When
the alcohol gas exist, the sensor’s conductivity gets higher along with the gas concentration
rising. It is suitable for various applications of detecting alcohol at different concentration. It is
widely used in domestic alcohol gas alarm, industrial alcohol gas alarm and portable alcohol
detector.
Features

High sensitivity to alcohol and small sensitivity to Benzine

Stable and long life

Fast response and High sensitivity

Only supported for Arduino Platform
Hardware Overview
This is an Analog output sensor. This needs to be connected to any one Analog socket
in Arduino (A0).
The output voltage from the Gas sensor increases when the concentration of gas increases.
Sensitivity can be adjusted by varying the potentiometer. The best preheat time for the sensor
is above 24 hours.
Connection to Arduino
Arduino Sensor
Figure - MQ3 Gas Sensor