Sensitive material of MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensors conductivity is more higher along with the gas concentration rising.
This is the new Arduino Uno R3. In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead of the 8U2 found on the Uno (or the FTDI found on previous generations). This allows for faster transfer rates and more memory.
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Affele is the place to get all the parts or things required to get you started with prototyping your ideas and make them happen. We and a vibrant community of geeks are always there to help you out whenever you're stuck. We are also going to start some cool services like Laser Cutting, 3D Printing, Circuit Design, PCB Routing and PCB Manufacturing in the near future.