Attributes

Brand	-
Category	Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin	-
Brand	TELESKY
Model Number	MQ-3
Operating Voltage	5V DC
Output Signal	Digital and Analog
Detection Gas	Alcohol, Ethanol
Interface Type	3-Pin Header
PCB Dimensions	32mm x 20mm
Net Weight	8 grams
Operating Temperature	-10°C to 50°C
Package Includes	1 x Sensor Module

5 reviews

Anonymous

Mar 05, 2026

Rating: 4/5

Good sensitivity

Detects alcohol vapor well. Calibration took some time but once set, it is consistent. Not for legal use though.

Anonymous

Mar 04, 2026

Rating: 4/5

Solid module

Build quality is decent. The pins are standard 0.1 inch spacing. Recommend using a separate 5V supply for stability.

Anonymous

Feb 25, 2026

Rating: 5/5

Exactly as described

Fast shipping and the sensor works as expected for ethanol detection experiments.

Anonymous

Feb 16, 2026

Rating: 5/5

Great for Arduino projects

Works perfectly with my Uno. Sensitivity is adjustable via the potentiometer. Just remember it needs warm-up time.

Anonymous

Jan 24, 2026

Rating: 5/5

Easy to use

Plug and play with basic code. The LED indicator is helpful to see when detection triggers.

5 FAQ

Q: How long does it need to warm up?

A: We recommend allowing the sensor to warm up for at least 24-48 hours for initial stabilization, then 5-10 minutes before each use.

Q: Can I use this for a legal breathalyzer?

A: No, this is a hobbyist sensor module and is not calibrated for legal or medical accuracy.

Q: Does this work with 3.3V logic?

A: The module operates at 5V, but the output can usually interface with 3.3V microcontrollers. Check your specific board specs.

Q: What gases does this detect besides alcohol?

A: While optimized for alcohol, it may also react to benzene, hexane, LPG, and methane.

Q: How do I adjust sensitivity?

A: There is a blue potentiometer on the board. Turn it to adjust the threshold for the digital output pin.

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