I can't see squat on that link...Originally Posted by amindzo
Well, write some code and show us what you've got...i think i should use MQ7 and MQ137 with this application, so i think i should use MQ series application circuit( that i attach you) and i can adjust the warning value with putting a potentiometer instead of red circled resistor in the picture(attached file) and turn it until adjust to warning value . am i right?
Aye...there's the rub...gotta have something to bump your numbers against. Time to run down to your local Standards and Calibrations lab and see what they say.but how can i calibrate the sensors in clean air? how can i understand that the value of potentiometer reaches to the suitable value ?
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