Alcohol MQ-3 sensor is sensitive material used in clean air, low conductivity tin dioxide (SnO2). When the sensor is present in the environment in which the alcohol vapor , the sensor’s conductivity increases with the concentration of alcohol gas in the air increases. Using a simple circuit can be converted to the change in conductivity of the gas concentration with the corresponding output signal. Alcohol MQ-3 sensor with high sensitivity to alcohol , gasoline can resist , smoke , water vapor interference. This sensor can detect various concentrations of alcohol atmosphere , is a low-cost sensors for a variety of applications
This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC. Mainly applicable to alcohol vapor.
The analog output voltage increases as the concentration of the gas in the detection environment increases.
Fast response to recovery features.Sensitivity adjustable Signal output indication
Alcohol MQ-3 Features:-
Working voltage: 2.5V ~ 5.0V
Fixed hole size: 2.0mm
The main purpose:
Car alcohol gas alarm and portable alcohol gas detector
Interface Description: (access MCU as an example)
VCC: then 2.5V ~ 5.0V
GND: Connect to GND
AOUT: connected to MCU.IO (analog output)
DOUT: connected to MCU.IO (digital output)
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