Added PT100 support for Ultiboard2

Marlin/language.h

 
 #define PROTOCOL_VERSION "1.0"
 
-#if MOTHERBOARD == 7 || MOTHERBOARD == 71
+#if MOTHERBOARD == 7 || MOTHERBOARD == 71 || MOTHERBOARD == 72
 	#define MACHINE_NAME "Ultimaker"
 	#define FIRMWARE_URL "http://firmware.ultimaker.com"
 #elif MOTHERBOARD == 80

Marlin/pins.h

 #define MOTOR_CURRENT_PWM_Z_PIN 45
 #define MOTOR_CURRENT_PWM_E_PIN 46
 //Motor current PWM conversion, PWM value = MotorCurrentSetting * 255 / range
-#define MOTOR_CURRENT_PWM_RANGE 2000
+#define MOTOR_CURRENT_PWM_RANGE 2000
+#define DEFAULT_PWM_MOTOR_CURRENT  {1300, 1300, 1250}
 
 //arduino pin witch triggers an piezzo beeper
 #define BEEPER 18

Marlin/temperature.cpp

   static unsigned long raw_temp_1_value = 0;
   static unsigned long raw_temp_2_value = 0;
   static unsigned long raw_temp_bed_value = 0;
-  static unsigned char temp_state = 0;
+  static unsigned char temp_state = 8;
   static unsigned char pwm_count = (1 << SOFT_PWM_SCALE);
   static unsigned char soft_pwm_0;
   #if (EXTRUDERS > 1) || defined(HEATERS_PARALLEL)
       temp_state = 0;
       temp_count++;
       break;
+    case 8: //Startup, delay initial temp reading a tiny bit so the hardware can settle.
+      temp_state = 0;
+      break;
 //    default:
 //      SERIAL_ERROR_START;
 //      SERIAL_ERRORLNPGM("Temp measurement error!");

Marlin/thermistortables.h

    {1016*OVERSAMPLENR, 0}
 };
 #endif
+
+#if (THERMISTORHEATER_0 == 20) || (THERMISTORHEATER_1 == 20) || (THERMISTORHEATER_2 == 20) || (THERMISTORBED == 20) // PT100 with INA826 amp on Ultimaker v2.0 electronics
+/* The PT100 in the Ultimaker v2.0 electronics has a high sample value for a high temperature.
+This does not match the normal thermistor behaviour so we need to set the following defines */
+#if (THERMISTORHEATER_0 == 20)
+# define HEATER_0_RAW_HI_TEMP 16383
+# define HEATER_0_RAW_LO_TEMP 0
+#endif
+#if (THERMISTORHEATER_1 == 20)
+# define HEATER_1_RAW_HI_TEMP 16383
+# define HEATER_1_RAW_LO_TEMP 0
+#endif
+#if (THERMISTORHEATER_2 == 20)
+# define HEATER_2_RAW_HI_TEMP 16383
+# define HEATER_2_RAW_LO_TEMP 0
+#endif
+#if (THERMISTORBED == 20)
+# define HEATER_BED_RAW_HI_TEMP 16383
+# define HEATER_BED_RAW_LO_TEMP 0
+#endif
+const short temptable_20[][2] PROGMEM = {
+{         0*OVERSAMPLENR ,       0     },
+{       227*OVERSAMPLENR ,       1     },
+{       236*OVERSAMPLENR ,       10     },
+{       245*OVERSAMPLENR ,       20     },
+{       253*OVERSAMPLENR ,       30     },
+{       262*OVERSAMPLENR ,       40     },
+{       270*OVERSAMPLENR ,       50     },
+{       279*OVERSAMPLENR ,       60     },
+{       287*OVERSAMPLENR ,       70     },
+{       295*OVERSAMPLENR ,       80     },
+{       304*OVERSAMPLENR ,       90     },
+{       312*OVERSAMPLENR ,       100     },
+{       320*OVERSAMPLENR ,       110     },
+{       329*OVERSAMPLENR ,       120     },
+{       337*OVERSAMPLENR ,       130     },
+{       345*OVERSAMPLENR ,       140     },
+{       353*OVERSAMPLENR ,       150     },
+{       361*OVERSAMPLENR ,       160     },
+{       369*OVERSAMPLENR ,       170     },
+{       377*OVERSAMPLENR ,       180     },
+{       385*OVERSAMPLENR ,       190     },
+{       393*OVERSAMPLENR ,       200     },
+{       401*OVERSAMPLENR ,       210     },
+{       409*OVERSAMPLENR ,       220     },
+{       417*OVERSAMPLENR ,       230     },
+{       424*OVERSAMPLENR ,       240     },
+{       432*OVERSAMPLENR ,       250     },
+{       440*OVERSAMPLENR ,       260     },
+{       447*OVERSAMPLENR ,       270     },
+{       455*OVERSAMPLENR ,       280     },
+{       463*OVERSAMPLENR ,       290     },
+{       470*OVERSAMPLENR ,       300     },
+{       478*OVERSAMPLENR ,       310     },
+{       485*OVERSAMPLENR ,       320     },
+{       493*OVERSAMPLENR ,       330     },
+{       500*OVERSAMPLENR ,       340     },
+{       507*OVERSAMPLENR ,       350     },
+{       515*OVERSAMPLENR ,       360     },
+{       522*OVERSAMPLENR ,       370     },
+{       529*OVERSAMPLENR ,       380     },
+{       537*OVERSAMPLENR ,       390     },
+{       544*OVERSAMPLENR ,       400     },
+{       614*OVERSAMPLENR ,       500     },
+{       681*OVERSAMPLENR ,       600     },
+{       744*OVERSAMPLENR ,       700     },
+{       805*OVERSAMPLENR ,       800     },
+{       862*OVERSAMPLENR ,       900     },
+{       917*OVERSAMPLENR ,       1000     },
+{       968*OVERSAMPLENR ,       1100     }
+};
+#endif
 
 #if (THERMISTORHEATER_0 == 51) || (THERMISTORHEATER_1 == 51) || (THERMISTORHEATER_2 == 51) || (THERMISTORBED == 51)
 // 100k EPCOS (WITH 1kohm RESISTOR FOR PULLUP, R9 ON SANGUINOLOLU! NOT FOR 4.7kohm PULLUP! THIS IS NOT NORMAL!)