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Sensors
MQ-2 Gas Sensor
Detects LPG, smoke, methane and similar gases.
Definition
An analog gas sensor whose resistance changes when target gases are present.
AI Application
Used in AI safety systems to classify smoke vs. cooking vs. real fire and reduce false alarms.
Parts & pins
1
VCC
5V power input
2
GND
Ground reference
3
DO
Digital output (HIGH/LOW)
4
AO
Analog output (0–Vcc)
5
Heating Element
Heats the sensing layer
6
Sensing Layer (SnO₂)
Resistance drops with target gas
Works with
Hardware you can wire this part to in a typical project.
