MQ3 alcohol sensor

MQ3

MQ3 is a gas-sensor module for experiments with alcohol vapour. Gas exposure changes sensor resistance, and the module’s analogue output can be read with a suitable ADC. Response is not selective: other gases, temperature, humidity and sensor ageing affect readings.

The module does not directly provide a calibrated ppm value. Quantitative readings require gas-specific calibration, reference conditions and documentation for the fitted sensor. On digital-comparator boards, the potentiometer adjusts the switching threshold rather than the sensing element’s intrinsic sensitivity. LED status is not a documented safety threshold.

Follow the conditioning and warm-up requirements for the exact sensor revision. Current Winsen reference datasheets typically specify at least 48 hours of initial preheating; stabilisation is also needed after subsequent power-up and storage. Initial conditioning does not remove the need for later warm-up and checks.

5V modules can produce analogue and digital signals near the supply voltage. Do not connect these directly to a 3.3V input without checking levels and using suitable voltage division or level conversion. This is a development and educational module, not a certified gas/CO alarm or a medical or legal measuring instrument.

What's in the package?

• 1 MQ3 alcohol sensor

Warranty and shipping

We do our best to test all electronics before sending them to you. 

This helps us deliver good work and saves you unnecessary trouble during development. Faults can occur, but we see them very rarely. If there is a problem with the equipment you ordered, you can always contact us, and we will be happy to help resolve it. 

We dispatch from Aarhus to Denmark and Sweden. Shipping options and prices are shown at checkout. Delivery time depends on availability, destination and shipping method; contact us before ordering if you need an item by a specific date.