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MQ-2
Sensors
Product ID:
HF334806
Stock:
30 units available
Details:
The MQ-2 Gas Sensor is a widely used gas and smoke detection module. It can detect flammable gases l...
The MQ-2 Gas Sensor is a widely used gas and smoke detection module. It can detect flammable gases like LPG, butane, methane, alcohol, propane, hydrogen, and even smoke in the surrounding air. Because of its sensitivity and low cost, it is commonly used in safety systems and IoT-based gas leak detection projects.
🔹 Details and Explanation
1. Main Features
Type: Gas and smoke sensor
Gases Detected: LPG, methane, butane, propane, alcohol, hydrogen, smoke
Operating Voltage: 5V DC
Current Consumption: ~150 mA
Output: Analog (variable voltage depending on gas concentration) + Digital (logic HIGH/LOW when gas exceeds set threshold)
Sensing Range: 200 ppm – 10,000 ppm
2. Working Principle
The MQ-2 sensor contains a heating element and a metal oxide semiconductor layer (SnO₂).
In clean air, the resistance of SnO₂ is high.
When target gases are present, they reduce the resistance → increasing current flow.
This change is converted into an analog voltage output.
The comparator (LM393 on module) gives a digital HIGH/LOW output depending on the threshold set by the onboard potentiometer.
3. Pin Configuration (MQ-2 Module)
VCC → +5V supply
GND → Ground
DO → Digital output (1 = gas detected, 0 = no gas)
AO → Analog output (proportional to gas concentration)
4. Applications
Gas leakage detection (LPG, methane, propane)
Smoke alarms
Alcohol breath analyzers
IoT-based home safety systems
Industrial safety monitoring
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PKR 300.00
