The MQ-2 gas sensor is sensitive to material used in clean air low conductivity producing tin oxide (sno2). When there is a situation in which the sensor is used for flammable gases, the conductivity in the sensor increases as the concentration of combustible gases in the air increases.
This sensor detects a variety of flammable gases, is a low-cost sensor for different 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 characteristic
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
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
More detailed information & instructions on MQ Gas Sensors is available at the Arduino Playground: https://playground.arduino.cc/Main/MQGasSensors
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MQ-2 Gas & Smoke Sensor Tutorial: LPG, Propane, Methane, Smoke Detection and Arduino Usage
This tutorial is a comprehensive, practical guide to the MQ-2 Gas & Smoke Sensor Module (Leobot Product #1640). It explains in detail what gases the MQ-2 can and cannot sense, how the sensor works internally, how to wire and calibrate it correctly, and how to use both the analog and digital outputs with Arduino for gas leakage detection, smoke alarms, and environmental monitoring projects.
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