Changeset 13157 for fact

Timestamp:

03/20/12 14:37:05 (13 years ago)

Author:

ogrimm

Message:

FSC resistances converted into temperature for online display

File:

• fact/FSCctrl/FSCctrl.cc (modified) (4 diffs)

fact/FSCctrl/FSCctrl.cc

@@ -5 +5 @@
 #include <sys/socket.h>
 #include <netdb.h>
+#include <math.h>
 
 #include "Evidence.h"
@@ -23 +24 @@
 
 const unsigned int MAX_VAL = TEMP_OFF + TEMP_NUM +100;
+
+// Parameters for PT1000
+const float R0 = 1000, A = 3.9083e-3, B = -5.775e-7;
 
 using namespace std;
@@ -76 +80 @@
 
   // Send start command to FSC board
-  snprintf(Buffer, sizeof(Buffer), "m");
+  snprintf(Buffer, sizeof(Buffer), "m\n");
   Result = write(Socket, Buffer, 1);
   if (Result != 1) S.Message(S.ERROR, "Could not write to socket (%s)", strerror(errno));
@@ -120 +124 @@
         }
 
+        // Translate resistance to temperatures
+        for (unsigned int i=0; i<TEMP_NUM; i++) {       
+          Val[i+TEMP_OFF] = -A/(2*B)-sqrt(pow(A/(2*B),2)-(R0-Val[i+TEMP_OFF])/(B*R0));
+        }
+        
         // Update DIM service
         Temperature.updateService();