mq-3 gas sensor


11 in stock.

SKU: 000226 Categories: , Tags: , , , , ,


Alcohol Ethanol Sensor Module Alcohol Concentration Alcohol Gas Detection Circuit Module

Tips: OUR products only to provide description description or electronic documentation, there is no technical advisory support, please beginners carefully shot, thank you for understanding.

MQ-3 Sensor Introduction:

The gas-sensing material used in the MQ-3 gas sensor is tin dioxide (SnO2), which has a low electrical conductivity in clean air. When the sensor in the presence of alcohol vapor, the conductivity of the sensor with the concentration of alcohol gas in the air increases. A simple circuit is used to convert the change in conductivity to an output signal corresponding to the gas concentration. MQ-3 gas sensor for high sensitivity to alcohol, can resist gasoline, smoke, water vapor interference. This sensor can detect a variety of concentrations of alcohol atmosphere, is a suitable for a variety of applications, low-cost sensor


Module Application:
Alcohol (ethanol) testing for motor vehicle drivers and other non-drinkers on-site testing of workers, but also for other places of ethanol vapor detection
Module Features:
1, the use of high-quality double-panel design, with power supply instructions and TTL signal output instructions;
2, with a DO switch signal (TTL) output and AO analog signal output;
3, TTL output valid signal is low. (When the output signal is low when the light can be directly connected to the microcontroller or relay module)
4, the analog output voltage, the higher the concentration the higher the voltage.
5, the alcohol detection has a better sensitivity.
6, there are four screw holes to facilitate positioning;
7, the product dimensions: 35.5 (L) * 22.5 (W) * 23 (H)
8, with long-term service life and reliable stability
9, rapid response to recovery characteristics

Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 3.3V)
AO output: 0.1-0.3V (relatively non-polluting), the highest concentration of voltage 4V or so
Special note: the sensor power, the need to preheat 20S or so, the measured data to be stable, the sensor is a normal fever, because the internal heating wire, if the hot is not normal.

1, VCC: Connect the positive pole of the power (5V)
2, GND: Connect the negative pole of the power supply
3, DO: TTL switch signal output
4, AO: analog signal output


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