37. MQ2 Analog Gas Sensor Brick(EF04028)#

37.1. Introduction#

The analog gas sensor MQ2 is used in gas leakage detecting equipments in consumer and industry markets, this sensor is suitable for detecting LPG, i-butane, propane, methane ,alcohol, hydrogen, smoke. It is of high sensitivity and fast response, the sensitivity can be adjusted by the potentiometer.


37.3. Characteristics#

Standard 3-pin GVS port is easy to plug.

37.4. Specification#

Item Parameter
SKU EF04028
Connections Type Analog
Pins Definition S-Sigal V-VCC G-GND
Working Voltage 5V
Size 38x27mm


37.5. Outlook and Dimension#


37.6. Quick to Start#

Materials required and connections diagram#

Connect to P1 port as the picture shows.

Take sensor:bit for example


Program as the picture shows#




You can also download it directly below:


Preheat it for 10 minutes after connections, detect the smoke by approaching the probes to the smoke while the returned value is almost stable. With the change of the smoke, the returned value gets bigger with the growing of the smoke concentration.

37.7. Relevant Cases#

37.8. Technical File#