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This is a simple breakout board for the MQ-3, MQ-4, MQ-6 and MQ-7 gas sensors.
Note: This is the PCB only.
Posted by Andrew on 23rd May 2012
The pinout for the gas sensors does not lend itself to use in breadboards or Arduino proto shields. Using this breakout board solves this problem. Adding 2 2 way header pins will enable a gas sensor to be plugged into a breadboard. The instructions for using it are non existant. I found that soldering the header pins onto the side with the printing first, then putting the gas sensor through the other side is best. This way you can still see the labels.
It took me a while to realise that the sensors can go either way round.
I had the red version of this board, the difference I can see is that A2 on green board was A1 on red board.