MQ-3 Alcohol Ethanol Gas Sensor Module Detection for Arduino DIY Kit MQ3


MQ-3 gas sensor is used to clean the air in the lower conductivity of tin dioxide (SnO2). When present in the environment in which the alcohol vapor sensor , a conductivity sensor with increasing concentration of alcohol gas in air is increased . Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. High MQ-3 gas sensor sensitivity to alcohol , gasoline resistant to interference , smoke, water vapor . This sensor can detect various concentrations of alcohol atmosphere , is a low-cost sensors for a variety of applications .

Gas may be used in homes and factories leakage monitoring device suitable for the detection of gas, butane , propane , methane , smoke , etc. ;

Using high-quality dual-panel design, with power indicator and TTL signal output instructions;

    • The switching signal having a DO (TTL) output and analog output AO ;
    • TTL output valid signal is low . ( Low-level signal when the output light can be directly connected to the microcontroller or relay module )
    • Analog output voltage with the higher concentration of higher voltage.
    • A gas, natural gas, city gas , smoke better sensitivity.
    • There are four screw holes for easy positioning ;
    • Has a long life and reliable stability
    • Rapid response and recovery characteristics

  • Input voltage : DC5V Power consumption ( current ): 150mA
  • DO output : TTL digital 0 and 1 ( 0.1 and 5V)
  • AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V
  • Size: approx. 32 x 22 x 16mm

Special note: After the sensor is powered , needs to warm up around 20S, measured data was stable , heat sensor is a normal phenomenon , because the internal heating wire , if hot is not normal .

VCC: positive power supply (5V)
GND: power supply is negative
DO: TTL switching signal output
AO: analog signal output

Package Included:
1 x MQ-3 Alcohol Ethanol Gas Sensor Module Detection for Arduino DIY Kit MQ3

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