removed analog ref

mit-drl · Apr 1, 2020 · 417b4ea · 417b4ea
1 parent 73635ec
commit 417b4ea
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Showing 2 changed files with 1 addition and 3 deletions.
diff --git a/Pressure.h b/Pressure.h
@@ -21,9 +21,8 @@ class Pressure {
     float Pmin = -100.0;   // pressure max in mbar
     float Pmax = 100.0;    // pressure min in mbar
     float Vmax = 1024;     // max voltage in range from analogRead
-    float R = 32./37;      // Internal 32K resistor and external 5K resistor ratio
     // convert to pressure
-    float pres = (10 * V/Vmax * R - 1) * (Pmax-Pmin)/8. + Pmin; //mmHg
+    float pres = (10 * V/Vmax - 1) * (Pmax-Pmin)/8. + Pmin; //mmHg
 
     // convert to cmH20
     pres *= 1.01972;

diff --git a/e-vent.ino b/e-vent.ino
@@ -165,7 +165,6 @@ void setup() {
 
   //Initialize
   pinMode(HOME_PIN, INPUT_PULLUP); // Pull up the limit switch
-  analogReference(EXTERNAL); // For the pressure and pots reading
   displ.begin();
   setState(PREHOME_STATE); // Initial state
   roboclaw.begin(38400); // Roboclaw