Simple breakout board for the MQ - 3, MQ - 4 and MQ - 6 gas sensors. 
All you need is VCC at 5V, GND, and a resistor to an ADC, that is it.

 

Note: This is the PCB only. Sensors not included.

 

Dimensions: 16.8mm diameter

 

Documents:

• Schematic
• Eagle Files
• Wiring Example