Calculate Dispenser Pressure in MPascal / Pascal / Bar / PSI

1 files changed, 26 insertions, 2 deletions

diff --git a/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c b/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
index d3d549063..8a51bc210 100644
--- a/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
+++ b/Software/Embedded_SW/Embedded/Modules/IDS/IDS_init.c
@@ -25,16 +25,40 @@ float DispenserPressure[MAX_SYSTEM_DISPENSERS] = {0};
 float CalculateDispenserPressure (int DispenserId)
 {
     unsigned short data = 0;
-    float temp= 0.0;
+    float temp = 0.0;
 
+/*
     data = ADC_GetReading(DispenserIdToPressureSensorId[DispenserId]);
     temp = 4096 - data;
     temp *= 3;
     temp *= 1000; //move to mv
     temp /= 4096;
     DispenserPressure[DispenserId] = 3000 - temp;
-    return( DispenserPressure[DispenserId]);
+    */
+
+    float Vlow = 0.004 * 130; // 4mA*130ohm (0 Pascal)
+    float VHigh = 0.020 *130; // 20mA*130ohm (1M Pascal)
+
+    float Bits_0Pascal = Vlow * 4096 / 3; // Vlow * 4096bit / 3Vref
+    float Bits_1MPascal = VHigh * 4096 / 3; // VHigh * 4096bit / 3Vref
+
+    float a = (1 - 0) / (Bits_1MPascal - Bits_0Pascal);// Mpascal/Bits
+
+    data = ADC_GetReading(DispenserIdToPressureSensorId[DispenserId]);
 
+    temp = Bits_1MPascal - data;
+
+    temp = a * temp;
+
+    DispenserPressure[DispenserId] = 1 - temp; // [Mpascal] ( 1 Mpascal = 10 Bar )
+
+    //unmark one of them to convert from Mpascal to :
+    //-----------------------------------
+    //DispenserPressure[DispenserId] / = 1000000; //Pascal
+    //DispenserPressure[DispenserId] *=10;        //Bar;
+    //DispenserPressure[DispenserId] *=145.0377;  //PSI;
+
+    return( DispenserPressure[DispenserId]);
 }