✨ Pt1000 with 2k2 pullup (SKR 3 / EZ) (MarlinFirmware#24790)

Author: discip

Marlin/Configuration.h

@@ -518,6 +518,7 @@
  *   110 : Pt100  with 1kΩ pullup (atypical)
  *   147 : Pt100  with 4.7kΩ pullup
  *  1010 : Pt1000 with 1kΩ pullup (atypical)
+ *  1022 : Pt1000 with 2.2kΩ pullup
  *  1047 : Pt1000 with 4.7kΩ pullup (E3D)
  *    20 : Pt100  with circuit in the Ultimainboard V2.x with mainboard ADC reference voltage = INA826 amplifier-board supply voltage.
  *                NOTE: (1) Must use an ADC input with no pullup. (2) Some INA826 amplifiers are unreliable at 3.3V so consider using sensor 147, 110, or 21.

Marlin/src/lcd/thermistornames.h

@@ -124,6 +124,8 @@
   #define THERMISTOR_NAME "ATC104GT-2 1K"
 #elif THERMISTOR_ID == 1047
   #define THERMISTOR_NAME "PT1000 4K7"
+#elif THERMISTOR_ID == 1022
+  #define THERMISTOR_NAME "PT1000 2K2"
 #elif THERMISTOR_ID == 1010
   #define THERMISTOR_NAME "PT1000 1K"
 #elif THERMISTOR_ID == 147

Marlin/src/module/thermistor/thermistor_1022.h

@@ -0,0 +1,45 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2022 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#define REVERSE_TEMP_SENSOR_RANGE_1022 1
+
+// Pt1000 with 1k0 pullup
+constexpr temp_entry_t temptable_1022[] PROGMEM = {
+  PtLine(  0, 1000, 2200),
+  PtLine( 25, 1000, 2200),
+  PtLine( 50, 1000, 2200),
+  PtLine( 75, 1000, 2200),
+  PtLine(100, 1000, 2200),
+  PtLine(125, 1000, 2200),
+  PtLine(150, 1000, 2200),
+  PtLine(175, 1000, 2200),
+  PtLine(200, 1000, 2200),
+  PtLine(225, 1000, 2200),
+  PtLine(250, 1000, 2200),
+  PtLine(275, 1000, 2200),
+  PtLine(300, 1000, 2200),
+  PtLine(350, 1000, 2200),
+  PtLine(400, 1000, 2200),
+  PtLine(450, 1000, 2200),
+  PtLine(500, 1000, 2200)
+};

Marlin/src/module/thermistor/thermistors.h

@@ -193,6 +193,9 @@ typedef struct { raw_adc_t value; celsius_t celsius; } temp_entry_t;
 #if ANY_THERMISTOR_IS(1010) // Pt1000 with 1k0 pullup
   #include "thermistor_1010.h"
 #endif
+#if ANY_THERMISTOR_IS(1022) // Pt1000 with 2k2 pullup
+  #include "thermistor_1022.h"
+#endif
 #if ANY_THERMISTOR_IS(1047) // Pt1000 with 4k7 pullup
   #include "thermistor_1047.h"
 #endif