MQ gas sensor breakout with Arduino UNO R4 Qwiic connector

TECHNICAL SUPPORT Sensors & Modules
1

Customer:

Can the MQ gas sensor breakout with easyC be directly connected to the Arduino UNO R4 Qwiic connector using a STEMMA wire, or does the sensor require a separate 5V power supply?

The plan is to connect multiple Soldered MQ gas sensors to the Arduino through an Adafruit PCA9548 8-Channel STEMMA QT / Qwiic I2C Multiplexer. Should I cut the red STEMMA wire and connect it to 5V?

Originally submitted via email support on 7 August 2025. Migrated to the forum for community visibility.

2

Soldered Support:

The Arduino UNO R4 Qwiic connector is 3v3 logic level and VCC, which matches our connectors. Our easyC/qwiic implementation is 3v3 as well, so this should work fine and nothing should break.

Make sure to give the MQ sensors time to warm up to get accurate readings.