Attributes

Brand	-
Category	Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin	-
Sensor Model	MQ-3
Detection Target	Alcohol Vapor / Ethanol
Operating Voltage	5V DC
Digital Output	TTL Logic (0 or 1)
Analog Output	0-5V
Heating Voltage	5.0V ± 0.2V
Circuit Voltage	5.0V ± 0.2V
Load Resistance	200KΩ
Operating Temperature	-10°C to 50°C
PCB Dimensions	32mm x 20mm x 14mm

5 reviews

Anonymous

Apr 16, 2026

Rating: 5/5

Great for Arduino Projects

Works perfectly with my Uno board. Calibration took some time but the analog reading is stable.

Anonymous

Feb 28, 2026

Rating: 4/5

Good sensitivity

Detects alcohol vapor well. Note that it needs a warm-up period before readings are accurate.

Anonymous

Feb 09, 2026

Rating: 5/5

Easy to use

Plug and play with the comparator module. LED indicator is helpful for debugging.

Anonymous

Feb 07, 2026

Rating: 5/5

Fast shipping

Arrived well packaged. Sensor responds quickly to changes in air quality.

Anonymous

Jan 21, 2026

Rating: 4/5

Solid component

Used this for a science fair project. Just remember it's not medical grade, but good for detection.

5 FAQ

Q: Can this detect methane?

A: No, the MQ-3 is specifically sensitive to alcohol. Please check MQ-4 for methane.

Q: How long is the warm-up time?

A: We recommend a preheat time of 24 hours for stable long-term use, but initial readings appear after 2-3 minutes.

Q: What is the pinout?

A: VCC, GND, DO (Digital Out), and AO (Analog Out). Please refer to the diagram in the description.

Q: Is there a library for this?

A: Yes, many generic MQ sensor libraries work with the analog output pin.

Q: Does this work with 3.3V logic?

A: The module operates at 5V. For 3.3V systems, a logic level converter is recommended.

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