testing multi ntc

Author: tablatronix

max31855.h

@@ -6,7 +6,7 @@
 #include <ktypelinear.h>
 // #include <quickstats.h> // @todo test quickstats, add child class for container
 // #include <Statistics.h> // https://github.com/provideyourown/statistics
-#include <ntc.h>
+#include <ntc_multi.h>
 #include <Average.h>
 #include <number_format.h>
 
@@ -17,9 +17,10 @@
 // HW cs       D8 15
 
 // #define MAXDO   5 // HWMISO
-#define MAXCS   15 // 2
-// #define MAXCLK  4 // HWSLK 
-Adafruit_MAX31855 tc(MAXCS);
+#define MAXCS   16 // 2
+#define MAXCLK  14 // HWSLK
+#define MAXMISO 4
+Adafruit_MAX31855 tc(MAXCLK,MAXCS,MAXMISO);
 
 #ifdef TC2
 Adafruit_MAX31855 tcB(1);

ntc_multi.h

@@ -0,0 +1,93 @@
+#ifndef ntc_h
+#define ntc_h
+
+#include "thermistor.h"
+/** 
+ * Author: Daniel Berenguer
+ * Creation date: 11/05/2014
+ * 
+ * Basic library that reads a NTC thermistor from an analog pin. Calculations relie on
+ * Steinhart–Hart equation: * 
+ *
+ * https://en.wikipedia.org/wiki/Thermistor#Steinhart.E2.80.93Hart_equation * 
+ *
+ * See the example for more information. * 
+ *
+ * Example of use with panStamp:
+ * https://github.com/panStamp/panstamp/wiki/Temperature-measurement-with-cheap-NTC's
+*/
+
+// Analog pin used to read the NTC
+#define NTC_PIN                36
+#define NTC_BPIN               39
+#define NTC_CPIN               33
+
+// #define VERBOSE_SENSOR_ENABLED 1
+
+// 100000 / (320000 +RT) * 3.3 
+int V = 3.3;
+int rt = 330000/V - 320000;
+
+// Thermistor object
+// THERMISTOR ntc(NTC_PIN,        // Analog pin
+//                       10000,          // Nominal resistance at 25 ºC
+//                       3950,           // thermistor's beta coefficient
+//                       10000);         // Value of the series resistor
+
+uint16_t resist = 100000;
+uint16_t betaco = 3950;
+bool lowside = true;
+
+THERMISTOR ntc(NTC_PIN,resist,betaco,resist,lowside);
+THERMISTOR ntcB(NTC_BPIN,resist,betaco,resist,!lowside);
+THERMISTOR ntcC(NTC_CPIN,resist,betaco,resist,lowside);
+
+// Global temperature reading
+float ntc_temp;
+float ntc_temp_b;
+float ntc_temp_c;
+
+/**
+ * setup
+ *
+ * Arduino setup function
+ */
+void init_ntc()
+{
+
+}
+
+float get_ntc(){
+  return ntc_temp;
+}
+
+float get_ntc_B(){
+  return ntc_temp_b;
+}
+
+float get_ntc_C(){
+  return ntc_temp_c;
+}
+/**
+ * loop
+ *
+ * Arduino main loop
+ */
+void read_ntc()
+{
+  ntc_temp = ntc.read();   // Read temperature
+  ntc_temp_b = ntcB.read();
+  ntc_temp_c = ntcC.read();
+  // Serial.print("Temp in 1/10 ºC : ");
+  // Serial.println(ntc_temp);
+  // Serial.print("Temp in ºF : ");
+  // Serial.println((((ntc_temp/10)*1.8)+32));
+}
+
+void printNTC(){
+  read_ntc();
+  float tempf = (((ntc_temp/10)*1.8)+32);
+  Serial.println("[NTC]: " + (String)(get_ntc()/10) + "ºC " + tempf + "ºF");	
+}
+
+#endif

reflow.h

@@ -39,7 +39,7 @@ BarGraph bar0;
 
 // #define USENTC // use thermistor
 #ifdef USENTC
-  #include <ntc.h>
+  #include <ntc_multi.h>
 #endif
 
 // symbol glyph font for icons
@@ -126,7 +126,7 @@ int SCREENHEIGHT = 240; // TFT_WIDTH
 int GRAPHHEIGHT = SCREENHEIGHT-(FOOTERH); //padding 200px
 int GRAPHWIDTH  = SCREENWIDTH;
 
-int graphInterval = 1000; // graph update rate ms
+int graphInterval = 400; // graph update rate ms
 
 TFT_eSprite spr = TFT_eSprite(&tft); 
 
@@ -146,6 +146,7 @@ int reflowStepTaskID = -1;
 int PIDTaskID = -1;
 int coolAbortTaskID = -1; // -1 empty
 
+uint16_t NTC_TEMP = 0;
 
 // REFLOW STATES
 #define RS_IDLE     0
@@ -888,7 +889,7 @@ void updateIcons(){
 
 void dispReflowStats(){
   String str = "";
-  str = "NTC: "+(String)(int)(round(get_ntc()/10));
+  str = "NTC: "+(String)(int)(round(NTC_TEMP/10));
   str += " CJ: " + (String)(int)(round(internalTemp));
   setFooterBL1(str);
   str = "";