From 535b90dc450d521e9567dbed050e411f91efdc50 Mon Sep 17 00:00:00 2001
From: Shlomo Hecht <shlomo@twine-s.com>
Date: Wed, 8 Aug 2018 19:12:19 +0300
Subject: fixes to the pressure calculation

---
 Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'Software/Embedded_SW/Embedded/Modules')

diff --git a/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c b/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
index 6312c701e..1efce00e3 100644
--- a/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
+++ b/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
@@ -35,9 +35,9 @@ void Calculateinit (void)
     Bits_0Pascal = Vlow * 4096 / 3; // Vlow * 4096bit / 3Vref = 709.973328 bits
     Bits_1MPascal = VHigh * 4096 / 3; // VHigh * 4096bit / 3Vref = 3549.86646 bits
 
-    a = (Bits_1MPascal - Bits_0Pascal) / (1 - 0) ;// Mpascal/Bits = 2839.89307
+    a = (1 - 0) / (Bits_1MPascal - Bits_0Pascal);// Mpascal/Bits = 0.000352125
 
-    b = Bits_0Pascal - (a * 0 ); //709.973328
+    b = 0 - (a * Bits_0Pascal ); // y = ax + b (x= Bits_0Pascal, y = 0)
 
 }
 float CalculateDispenserPressure (int DispenserId)
@@ -58,7 +58,7 @@ float CalculateDispenserPressure (int DispenserId)
     if(data<Bits_0Pascal)
         data = Bits_0Pascal;//40mA 0Bar
 
-    temp = (data - b) / a;
+    temp = a * data + b;
 
     DispenserPressure[DispenserId] = temp; // [Mpascal] ( 1 Mpascal = 10 Bar )
 
-- 
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