i am trying to detect different gases like Co2,Nh4,lpg,H2 and other using mq2. my doubt is in the datasheet given various curves for different gases, so
1)how can i differentiate gases as i can get same voltage for differnt gases.(in the graph if get Rs/Ro ==1, is that mean that i have 600ppm of lpg and propane;1000 ppm of h2;4000ppm of alcohol )
2)is the graph platted by taking one gas at a time or combining all gases?