Fix up some accuracy issues with PT100 temp sensors in relation to the Rambo v1.3a

Firmware/thermistortables.h

@@ -1033,7 +1033,9 @@ const short temptable_12[][2] PROGMEM = {
 
 #define PtA 3.9083E-3
 #define PtB -5.775E-7
+#define PtC -4.183E-12
 #define PtRt(T,R0) ((R0)*(1.0+(PtA)*(T)+(PtB)*(T)*(T)))
+#define PtRtNew(T,R0) ((R0)*(1.0+(PtA)*(T)+(PtB)*(T)*(T) + (T-100)*PtC*(T)*(T)*(T)))
 #define PtAdVal(T,R0,Rup) (short)(1024/(Rup/PtRt(T,R0)+1))
 #define PtLine(T,R0,Rup) { PtAdVal(T,R0,Rup)*OVERSAMPLENR, T },
 
@@ -1059,93 +1061,124 @@ const short temptable_147[][2] PROGMEM = {
   PtLine(200,100,4700)
   PtLine(250,100,4700)
   PtLine(300,100,4700)
-  PtLine(350,100,4700)
-  PtLine(400,100,4700)
-  PtLine(450,100,4700)
-  PtLine(500,100,4700)
-  PtLine(550,100,4700)
-  PtLine(600,100,4700)
-  PtLine(650,100,4700)
-  PtLine(700,100,4700)
-  PtLine(750,100,4700)
-  PtLine(800,100,4700)
-  PtLine(850,100,4700)
-  PtLine(900,100,4700)
-  PtLine(950,100,4700)
-  PtLine(1000,100,4700)
-  PtLine(1050,100,4700)
-  PtLine(1100,100,4700)
 };
 #endif
-#if (THERMISTORHEATER_0 == 148) || (THERMISTORHEATER_1 == 148) || (THERMISTORHEATER_2 == 148) || (THERMISTORBED == 148) // Pt100 with 4k7 MiniRambo pullup, no Amp.
+// E3D Pt100 with 4k7 MiniRambo pullup, no Amp on the MiniRambo v1.3a
+#if (THERMISTORHEATER_0 == 148) || (THERMISTORHEATER_1 == 148) || (THERMISTORHEATER_2 == 148) || (THERMISTORBED == 148)
 const short temptable_148[][2] PROGMEM = {
-// More raw data values avaliable via http://www.micropik.com/PDF/pt100.pdf
-// This information is taken from http://shop.prusa3d.com/forum/improvements-f14/mini-rambo-1-3-and-e3d-with-pt100-t700-s40.html#p20938
-{292,0}, // first two entries are bogus, just to get the heater running
-{356,50},
-{469,100},
-{531,150},
-{590,200},
-{649,250},
-{708,300},
-{763,350},
-{819,400},
-{872,450},
+// These values have been calculated and tested over many days.  See https://docs.google.com/spreadsheets/d/1MJXa6feEe0mGVCT2TrBwLxVOMoLDkJlvfQ4JXhAdV_E
+// Values that are missing from the 5C gap are missing due to resolution limits.
+{19.00000 * OVERSAMPLENR,  0},
+{19.25000 * OVERSAMPLENR,  5},
+{19.50000 * OVERSAMPLENR, 10},
+{19.87500 * OVERSAMPLENR, 15},
+{20.25000 * OVERSAMPLENR, 20},
+{21.00000 * OVERSAMPLENR, 25},
+{21.75000 * OVERSAMPLENR, 35},
+{22.00000 * OVERSAMPLENR, 40},
+{23.00000 * OVERSAMPLENR, 50},  // 55C is more commonly used.
+{23.75000 * OVERSAMPLENR, 60},
+{24.00000 * OVERSAMPLENR, 65},
+{24.06250 * OVERSAMPLENR, 70},
+{25.00000 * OVERSAMPLENR, 75},
+{25.50000 * OVERSAMPLENR, 85},
+{26.00000 * OVERSAMPLENR, 90},
+{26.93750 * OVERSAMPLENR,100},
+{27.00000 * OVERSAMPLENR,105},
+{27.37500 * OVERSAMPLENR,110},
+{28.00000 * OVERSAMPLENR,115},
+{29.00000 * OVERSAMPLENR,125},
+{29.25000 * OVERSAMPLENR,135},
+{30.00000 * OVERSAMPLENR,140},
+{35.50000 * OVERSAMPLENR,150},
+{31.00000 * OVERSAMPLENR,155},
+{32.00000 * OVERSAMPLENR,165},
+{32.18750 * OVERSAMPLENR,175},
+{33.00000 * OVERSAMPLENR,180},
+{33.62500 * OVERSAMPLENR,190},
+{34.00000 * OVERSAMPLENR,195},
+{35.00000 * OVERSAMPLENR,205},
+{35.50000 * OVERSAMPLENR,215},
+{36.00000 * OVERSAMPLENR,220},
+{36.75000 * OVERSAMPLENR,230},
+{37.00000 * OVERSAMPLENR,235},
+{37.75000 * OVERSAMPLENR,245},
+{38.00000 * OVERSAMPLENR,250},
+{38.12500 * OVERSAMPLENR,255},
+{39.00000 * OVERSAMPLENR,260},
+{40.00000 * OVERSAMPLENR,275},
+{40.25000 * OVERSAMPLENR,285},
+{41.00000 * OVERSAMPLENR,290},
+{41.25000 * OVERSAMPLENR,300},
+{42.00000 * OVERSAMPLENR,305},
+{43.00000 * OVERSAMPLENR,315},
+{43.25000 * OVERSAMPLENR,325},
+{44.00000 * OVERSAMPLENR,330},
+{44.18750 * OVERSAMPLENR,340},
+{45.00000 * OVERSAMPLENR,345},
+{45.25000 * OVERSAMPLENR,355},
+{46.00000 * OVERSAMPLENR,360},
+{46.62500 * OVERSAMPLENR,370},
+{47.00000 * OVERSAMPLENR,375},
+{47.25000 * OVERSAMPLENR,385},
+{48.00000 * OVERSAMPLENR,390},
+{48.75000 * OVERSAMPLENR,400},
+{49.00000 * OVERSAMPLENR,405},
 };
 #endif
 #if (THERMISTORHEATER_0 == 247) || (THERMISTORHEATER_1 == 247) || (THERMISTORHEATER_2 == 247) || (THERMISTORBED == 247) // Pt100 with 4k7 MiniRambo pullup & PT100 Amplifier
 const short temptable_247[][2] PROGMEM = {
 // Calculated from Bob-the-Kuhn's PT100 calculator listed in https://github.com/MarlinFirmware/Marlin/issues/5543
 // and the table provided by E3D at http://wiki.e3d-online.com/wiki/E3D_PT100_Amplifier_Documentation#Output_Characteristics.
-{   0 * OVERSAMPLENR,    0 },
-{ 244 * OVERSAMPLENR,    1 },
-{ 252 * OVERSAMPLENR,   10 },
-{ 262 * OVERSAMPLENR,   20 },
-{ 270 * OVERSAMPLENR,   30 },
-{ 278 * OVERSAMPLENR,   40 },
-{ 286 * OVERSAMPLENR,   50 },
-{ 294 * OVERSAMPLENR,   60 },
-{ 302 * OVERSAMPLENR,   70 },
-{ 310 * OVERSAMPLENR,   80 },
-{ 318 * OVERSAMPLENR,   90 },
-{ 326 * OVERSAMPLENR,  100 },
-{ 334 * OVERSAMPLENR,  110 },
-{ 344 * OVERSAMPLENR,  120 },
-{ 352 * OVERSAMPLENR,  130 },
-{ 358 * OVERSAMPLENR,  140 },
-{ 366 * OVERSAMPLENR,  150 },
-{ 374 * OVERSAMPLENR,  160 },
-{ 382 * OVERSAMPLENR,  170 },
-{ 390 * OVERSAMPLENR,  180 },
-{ 398 * OVERSAMPLENR,  190 },
-{ 406 * OVERSAMPLENR,  200 },
-{ 414 * OVERSAMPLENR,  210 },
-{ 422 * OVERSAMPLENR,  220 },
-{ 430 * OVERSAMPLENR,  230 },
-{ 436 * OVERSAMPLENR,  240 },
-{ 444 * OVERSAMPLENR,  250 },
-{ 452 * OVERSAMPLENR,  260 },
-{ 458 * OVERSAMPLENR,  270 },
-{ 466 * OVERSAMPLENR,  280 },
-{ 474 * OVERSAMPLENR,  290 },
-{ 480 * OVERSAMPLENR,  300 },
-{ 488 * OVERSAMPLENR,  310 },
-{ 496 * OVERSAMPLENR,  320 },
-{ 504 * OVERSAMPLENR,  330 },
-{ 510 * OVERSAMPLENR,  340 },
-{ 518 * OVERSAMPLENR,  350 },
-{ 524 * OVERSAMPLENR,  360 },
-{ 532 * OVERSAMPLENR,  370 },
-{ 538 * OVERSAMPLENR,  380 },
-{ 546 * OVERSAMPLENR,  390 },
-{ 554 * OVERSAMPLENR,  400 },
-{ 622 * OVERSAMPLENR,  500 },
-{ 688 * OVERSAMPLENR,  600 },
-{ 749 * OVERSAMPLENR,  700 },
-{ 809 * OVERSAMPLENR,  800 },
-{ 865 * OVERSAMPLENR,  900 },
-{ 919 * OVERSAMPLENR, 1000 },
-{ 969 * OVERSAMPLENR, 1100 },
+{  0 * OVERSAMPLENR,    0},
+{241 * OVERSAMPLENR,    1},
+{249 * OVERSAMPLENR,   10},
+{259 * OVERSAMPLENR,   20},
+{267 * OVERSAMPLENR,   30},
+{275 * OVERSAMPLENR,   40},
+{283 * OVERSAMPLENR,   50},
+{291 * OVERSAMPLENR,   60},
+{299 * OVERSAMPLENR,   70},
+{307 * OVERSAMPLENR,   80},
+{315 * OVERSAMPLENR,   90},
+{323 * OVERSAMPLENR,  100},
+{331 * OVERSAMPLENR,  110},
+{340 * OVERSAMPLENR,  120},
+{348 * OVERSAMPLENR,  130},
+{354 * OVERSAMPLENR,  140},
+{362 * OVERSAMPLENR,  150},
+{370 * OVERSAMPLENR,  160},
+{378 * OVERSAMPLENR,  170},
+{386 * OVERSAMPLENR,  180},
+{394 * OVERSAMPLENR,  190},
+{402 * OVERSAMPLENR,  200},
+{410 * OVERSAMPLENR,  210},
+{418 * OVERSAMPLENR,  220},
+{426 * OVERSAMPLENR,  230},
+{432 * OVERSAMPLENR,  240},
+{440 * OVERSAMPLENR,  250},
+{448 * OVERSAMPLENR,  260},
+{454 * OVERSAMPLENR,  270},
+{462 * OVERSAMPLENR,  280},
+{469 * OVERSAMPLENR,  290},
+{475 * OVERSAMPLENR,  300},
+{483 * OVERSAMPLENR,  310},
+{491 * OVERSAMPLENR,  320},
+{499 * OVERSAMPLENR,  330},
+{505 * OVERSAMPLENR,  340},
+{513 * OVERSAMPLENR,  350},
+{519 * OVERSAMPLENR,  360},
+{527 * OVERSAMPLENR,  370},
+{533 * OVERSAMPLENR,  380},
+{541 * OVERSAMPLENR,  390},
+{549 * OVERSAMPLENR,  400},
+{616 * OVERSAMPLENR,  500},
+{682 * OVERSAMPLENR,  600},
+{741 * OVERSAMPLENR,  700},
+{801 * OVERSAMPLENR,  800},
+{856 * OVERSAMPLENR,  900},
+{910 * OVERSAMPLENR, 1000},
+{960 * OVERSAMPLENR, 1100},
 };
 #endif
 #if (THERMISTORHEATER_0 == 1010) || (THERMISTORHEATER_1 == 1010) || (THERMISTORHEATER_2 == 1010) || (THERMISTORBED == 1010) // Pt1000 with 1k0 pullup

Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h

@@ -336,7 +336,7 @@ THERMISTORS SETTINGS
 #if defined(E3D_PT100_EXTRUDER_WITH_AMP)
 #define TEMP_SENSOR_0 247
 #elif defined(E3D_PT100_EXTRUDER_NO_AMP)
-#define TEMP_SENSOR_0 147
+#define TEMP_SENSOR_0 148
 #else
 #define TEMP_SENSOR_0 5
 #endif
@@ -345,7 +345,7 @@ THERMISTORS SETTINGS
 #if defined(E3D_PT100_BED_WITH_AMP)
 #define TEMP_SENSOR_BED 247
 #elif defined(E3D_PT100_BED_NO_AMP)
-#define TEMP_SENSOR_BED 147
+#define TEMP_SENSOR_BED 148
 #else
 #define TEMP_SENSOR_BED 1
 #endif

Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h

@@ -329,14 +329,14 @@ THERMISTORS SETTINGS
 // 1047 is Pt1000 with 4k7 pullup
 // 1010 is Pt1000 with 1k pullup (non standard)
 // 147 is Pt100 with 4k7 pullup
-// 148 is Pt100 with 4k7 pullup and no PT100 Amplifier (in case type 147 doesn't work)
+// 148 is E3D Pt100 with 4k7 pullup and no PT100 Amplifier on a MiniRambo 1.3a
 // 247 is Pt100 with 4k7 pullup and PT100 Amplifier
 // 110 is Pt100 with 1k pullup (non standard)
 
 #if defined(E3D_PT100_EXTRUDER_WITH_AMP)
 #define TEMP_SENSOR_0 247
 #elif defined(E3D_PT100_EXTRUDER_NO_AMP)
-#define TEMP_SENSOR_0 147
+#define TEMP_SENSOR_0 148
 #else
 #define TEMP_SENSOR_0 5
 #endif
@@ -345,7 +345,7 @@ THERMISTORS SETTINGS
 #if defined(E3D_PT100_BED_WITH_AMP)
 #define TEMP_SENSOR_BED 247
 #elif defined(E3D_PT100_BED_NO_AMP)
-#define TEMP_SENSOR_BED 147
+#define TEMP_SENSOR_BED 148
 #else
 #define TEMP_SENSOR_BED 1
 #endif