MQ-2 Gas Sensor Brick

MQ-4

MQ-05

Carbon monoxide (CO) is a very dangerous gas which is odorless, colorless, and tasteless, so it cannot be smelt, seen, or tasted. A person really would have no idea that they are breathing in CO besides the fact that they would start to feel horrible.

MQ-3

MQ-135

This carrier board is designed to work with any of the MQ-series gas sensors, simplifying the interface from 6 to 3 pins—ground, power and analog voltage output—that are broken out with a 0.1" spacing, making the board compatible with 0.1" headers and standard breadboards and perfboards. 

This is the first CO2 sensor in Arduino market.

This is a simple-to-use hydrogen gas sensor.

Este sensor de álcool tem boa sensibilidade e resposta rápida ao álcool. É adequado para detector de álcool portátil.

Este sensor serve para testar a qualidade do ar de interiores. Os principais gases detectados são monoxido de carbono, álcool, acetona, formaldeído entre outros.  É um sensor compatível com alimentações de 3.3V e 5V.