sundberg84 Don't bother, I went through the hassle, downloaded Eagle and created readable PDF
Best posts made by APL2017

RE: ðŸ’¬ Easy/Newbie PCB for MySensors

RE: ðŸ’¬ Gas Sensor
Lack of support makes you think, so I figured out the "hidden" calculations in the sketch above and proposing the code modification to allow users to port the code to a different gas sensor using data taken directly from the sensor chart. Here are modified fragments of the code showing only CO curve for MQ2 sensor:
float CO2Curve[4] = {0.8,200,2.2,10};
//two end points are taken from the curve with two coordinates for each point
//in form of{Y1, X1,Y2, X2) where X is PPM axis, Y is Rs/Ro axis from the sensor chart for specifc gas
//then equation X=(Yb)/m is used,
//where m is slope of the curve, b is Y axis intersept point
float Slope = (log(pcurve(1)log(pcurve(0))/(log(pcurve(3)log(pcurve(2));
float Y_Intercept=log(pcurve(1)Slope*log(pcurve(3);int MQGetPercentage(float rs_ro_ratio, float *pcurve)
{
{ return (pow(10,((log(rs_ro_ratio)Y_Intercept)/Slope))); }
} 
RE: ðŸ’¬ Gas Sensor
Sure, the curve is there. I am trying to make sense out of two points curve that is used in sketch for MQ2 sensor, CO gas. "point1: (lg200, 0.72), point2: (lg10000, 0.15)" while I see on the curve from datasheet (lg200, 5.2) and (lg10000, 1.3). That is why I am asking for help, sorry for not making it clear.