@SaiTechEce
Using Gas Sensor (MQ-2) Smoke Detection Alarm With Arduino uno
Code & Circuit Link : drive.google.c...
The MQ-2 gas sensor is a popular and versatile device used for detecting various gases, including LPG, i-butane, propane, methane, alcohol, hydrogen, and smoke. It is commonly used in safety and automation systems, especially for detecting gas leaks or monitoring air quality. Here's a detailed overview of the MQ-2 gas sensor:
Key Features
Sensitivity to Multiple Gases:
Detects LPG, i-butane, propane, methane, alcohol, hydrogen, and smoke.
High sensitivity to smoke and flammable gases.
Analog and Digital Output:
Provides both analog output (proportional to the concentration of gases) and digital output (threshold level can be set).
Wide Detection Range:
Suitable for a range of concentrations of gases.
Long Life and Low Cost:
Durable with a long lifespan.
Economical and widely available.
Technical Specifications
Supply Voltage: 5V DC
Power Consumption: 800mW (heater current)
Output Signal: Analog (0-5V) and Digital
Preheat Time: Over 24 hours for stable readings
Sensitivity: Adjustable via a potentiometer
Load Resistance: Adjustable, typically 20kΩ to 200kΩ
Operating Temperature: -20°C to 50°C
Working Principle
The MQ-2 sensor uses a tin dioxide (SnO2) sensing layer, which has low conductivity in clean air. When target gases are present, the sensor's conductivity increases in proportion to the gas concentration. The change in resistance is measured and converted into an output signal.
Applications
Gas Leak Detection:
Used in household and industrial gas leak detection systems.
Can detect leaks of LPG, methane, and other combustible gases.
Smoke Detection:
Employed in smoke detectors and fire alarm systems.
Air Quality Monitoring:
Monitors air quality in homes and buildings.
Detects harmful levels of gases and smoke.
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