MQ7

[azambo3]

Hello!
I bought the MQ7 gas sensor (full packet with module )and I connect it to arduino uno ,does the reading I do get from the sensor is already in ppm or I need to do some coding to convert the sensor reading to ppm ?!
please help ,thank you

[Apis210]

Hi. Did you use any library for the coding or you just use analog read to get the output?

[azambo3]

I just used the analog output to get the reading without using any library code .

[Apis210]

You can refer to this tutorial. He used MQ2 sensor but the concept is same. In this link, he explain about gas sensor in step 3.

The output that you get is only the analog value.To determine the PPM you'll need to follow the break-in and calibration procedure on the MQ-7 datasheet, as well as adjusting for relative humidity. You can refer to the datasheet to do so.

Hope it may helps.