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MQ 3 Alcohol Ethanol Sensor Module Breath Alcohol Detection

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Available Stock : 6 Unit

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Product Overview

The MQ 3 alcohol sensor is reasonable for alcohol concentration sensing on your breath, much the same as your normal breathalyzer. It has a high affectability and quick response time. Sensor gives an analog resistive yield in presence of alcohol concentration. The drive circuit is exceptionally basic, all it needs is one resistor. A straightforward interface could be a 0-3.3V ADC.


Input voltage
Power consumption(current)
150 mA
DO output
TTL digital 0 and 1 ( 0.1 and 5V)
AO output
0.1 - 0.3 V (pollution-free)
Highest concentration of voltage
Approx. 4V
Detection range of alcohol
10 ~ 1000 PPM
positive power supply (5V)
power supply is negative
TTL switching signal output
analog signal output

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Working Principle

The MQ3 Alcohol Gas Sensor consist of a low cost semiconductor, whose conductivity is low in clean air. Its quality of becoming more conductive when come in contact with alcoholic gases makes it useful in detection of alcohol consumption. The sensitive material used for this sensor is SnO2, and it is sensitive to alcoholic gases. As the concentration of alcohol gases increases, the conductivity of the sensor increases and it can be used to detect the presence of alcohol gases at concentrations from 0.05 mg/L to 10 mg/L.

Interfacing Diagrams