Updated Scaling function

The R0 resistance and scaling functions were updated and adapted to correspond better to the reference Keto-Diastix test strips results.
michan18 · Jun 27, 2013 · a6673a6 · a6673a6
1 parent 63525f3
commit a6673a6
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Showing 2 changed files with 3 additions and 8 deletions.
diff --git a/.DS_Store b/.DS_Store
diff --git a/ketosense/ketosense.ino b/ketosense/ketosense.ino
@@ -71,7 +71,7 @@ float value2 = 0;
 float value3 = 0;
 
 // General Var
-float R0 = 3000;
+float R0 = 4500;
 int lastPPM = 0;
 
 double currentHumidity;
@@ -263,15 +263,10 @@ int acetoneResistanceToPPMf(float resistance){
   if (tempResistance > 50000){
   double PPM = 0;
   }
-  else if (tempResistance <= 50000 && tempResistance > 3600){
-  double logPPM = (log10(tempResistance/R0)*-1.5512)+2.5911;
+  else {
+  double logPPM = (log10(tempResistance/R0)*-2.6)+2.7;
    PPM = pow(10, logPPM);
   }
-  else{
-  double logPPM = (log10(tempResistance/R0)*-0.9768)+2.4906;
-   PPM = pow(10, logPPM);
-  }
-
   return (int)PPM;
 }