From 417b4ead942209f590544ea7e7a537d06d2832e9 Mon Sep 17 00:00:00 2001
From: "br.araki" <br.araki@gmail.com>
Date: Tue, 31 Mar 2020 20:45:09 -0400
Subject: [PATCH] removed analog ref

---
 Pressure.h | 3 +--
 e-vent.ino | 1 -
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/Pressure.h b/Pressure.h
index 3afff6f..d595531 100644
--- 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
index d726515..1fc0e6e 100644
--- 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