test

vars:

float Rl=10.0;
float approx=2373.315;
int GasSensorPin=2;
float Rs,Vout,count,ratio,GasConc; int ppm;

Code:

count=analogRead(GasSensorPin);
Vout=(count*4.88)/1000.0;
Rs=((5.0*Rl)-(Rl*V out))/Vout;
ratio=Rs/approx;
GasConc=146.15*(2.868-ratio)+10;
ppm=GasConc;