Bit-Tree Creativity - MQ2 Gas & Smoke Sensor

MQ2 Gas & Smoke Sensor (A033)

BIT-TREE MQ2 gas and smoke sensor operates on 5V DC power supply. It can detect liquefied gas, smoke and other combustible gas. With dual digital + analog output, built-in preheating stabilization and threshold adjustment functions, it is widely applied to gas alarm, smoke monitoring, security maker projects.

Dual digital & analog output

Combustible gas detection

5V plug-and-play operation

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Parameter Category	Item	Specification Details
Basic Information	Product Model	A033
Basic Information	Product Name	MQ2 Gas and Smoke Sensor (A033)
Basic Information	Product Weight	Weight with housing: 17g; bare PCB weight: 8.5g
Basic Parameters	Module Outline Dimension	Refer to attached drawing
Electrical Parameters	Operating Voltage	DC 5V
Electrical Parameters	Operating Current	150mA
Output Characteristics	Output Mode	Dual output: digital DO switching output + analog AO continuous voltage output
Pin Definition	VCC	5V positive power supply pin
Pin Definition	GND	5V negative power supply pin, system common ground
Pin Definition	DO	TTL digital switching signal output
Pin Definition	AO	Analog voltage signal output, connect to MCU ADC pin
Status Indication	POWER LED	Power-on indicator light
Status Indication	DOUT LED	Digital output trigger indicator light
Usage Notes	Preheating Requirement	Collect stable and accurate data only after 20 seconds of power-on preheating
Usage Notes	Heat Description	Built-in heating wire inside the module; heat generation during operation is normal
Packaging Solutions	Optional Packaging	① Anti-static bag soft package ② White cardboard hanging hole box ③ Kraft paper box

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