Waveshare MQ-3 Gas Sensor


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SKU: 1219077
  1. Power: 2.5V ~ 5.0V
  2. Dimension: 40.0mm * 21.0mm
  3. Mounting holes size: 2.0mm
  4. Boost Converter Chip: PT1301


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Category: Gas and Dust Sensor

The sensor determines the concentration of alcohol in the air, the result can be obtained measuring the voltage on the analog output. The system is powered with the voltage from 2.5 V to 5 V. It has a digital and analog output, making it compatible with mostof the commissioning modules including Raspberry Pi and Arduino.

The digital output D0

With the help of placed on the reverse side of the board, potentiometer, set is the threshold, exceeding of which, causes the output D0 changing from a high to a low status. The pin D0 can be linked directly with a microcontroller or commissioning set, including Arduino, or for example, a module with a buzzer, which will signal a too low or too high level of alcohol in the air.

Analog output A0

The sensor has an analog output A0, which must be connected to the pin of the converter A/D (analog input in Arduino). This will allow you to measure the proportional voltage signal and more accurately determine the level of alcohol.

Operating principle:
MQ-3 gas sensor applies SnO2 which has a lower conductivity in the clear air as a gas-sensing material. In an atmosphere where there may be alcohol gas, the conductivity of the gas sensor raises along with the concentration of the alcohol gas increases.


  1. Sensitive for alcohol, ethanol
  2. Output voltage boosts along with the concentration of the measured gases increases
  3. Fast response and recovery
  4. Adjustable sensitivity
  5. Signal output indicator


  1. Power supply: from 2.5 V to 5 V
  2. Analog and digital output
  3. Pins: goldpin connectors, 2.54 mm pitch
  4. Board sizes: 40 x 21 mm
  5. It has mounting holes with the diameter: 2 mm

Package Includes:

1 x MQ-3 Gas Sensor
1 x 4-pin custom connector jumper wire

SKU: 1219077 Category:

2.5 V to 5 V

Output Pin

Analog and digital


Gold pin connectors, 2.54 mm pitch

Board size

40 x 21 mm

Mounting Holes Diameter (mm)

2 mm

Boost Converter Chip



Analog output, Digital Output, Power ground, VCC Positive power supply (2.5V-5.0V)

Shipping Weight 0.001 kg
Shipping Dimensions 6 × 4 × 1 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China

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