sd.voltage=analogRead(A0)*0.04285078-0.05942125;// by linear regression for my(!) voltage divider. else: sd.voltage = analogRead(A0)*3.3*(R1+R2)/(R2*1024)
sd.voltage=analogRead(A0)*0.04285078-0.05942125;// by linear regression for my(!) voltage divider. else: sd.voltage = analogRead(A0)*3.3*(R1+R2)/(R2*1024)