diff --git a/Marlin/src/HAL/HAL_STM32F1/HAL_Stm32f1.cpp b/Marlin/src/HAL/HAL_STM32F1/HAL_Stm32f1.cpp
index 5082953f8eac..f08ada0fc6e6 100644
--- a/Marlin/src/HAL/HAL_STM32F1/HAL_Stm32f1.cpp
+++ b/Marlin/src/HAL/HAL_STM32F1/HAL_Stm32f1.cpp
@@ -51,6 +51,7 @@
 // --------------------------------------------------------------------------
 // Variables
 // --------------------------------------------------------------------------
+STM32ADC adc(ADC1);
 
 // --------------------------------------------------------------------------
 // Public Variables
@@ -88,16 +89,30 @@ uint8 adc_pins[] = {
 
 enum TEMP_PINS
 {
+  #if HAS_TEMP_0
     TEMP_0,
+  #endif
+  #if HAS_TEMP_1
     TEMP_1,
+  #endif
+  #if HAS_TEMP_2
     TEMP_2,
+  #endif
+  #if HAS_TEMP_3
     TEMP_3,
+  #endif
+  #if HAS_TEMP_4
     TEMP_4,
+  #endif
+  #if HAS_TEMP_BED
     TEMP_BED,
-    FILWIDTH
+  #endif
+  #if ENABLED(FILAMENT_WIDTH_SENSOR)
+    FILWIDTH,
+  #endif
+    ADC_PIN_COUNT
 };
 
-#define ADC_PIN_COUNT (sizeof(adc_pins)/sizeof(adc_pins[0]))
 uint16_t HAL_adc_results[ADC_PIN_COUNT];
 
 
@@ -180,30 +195,44 @@ void HAL_adc_init(void)
 
 void HAL_adc_start_conversion (uint8_t adc_pin) {
   TEMP_PINS pin_index = TEMP_0;
-  if (adc_pin == TEMP_0_PIN){
-      pin_index = TEMP_0;
-  }
 
-  else if (adc_pin == TEMP_1_PIN) {
+  switch (adc_pin) {
+  #if HAS_TEMP_0
+    case TEMP_0_PIN:
+        pin_index = TEMP_0;
+        break;
+  #endif
+  #if HAS_TEMP_1
+    case TEMP_1_PIN:
     pin_index = TEMP_1;
-  }
-  else if (adc_pin == TEMP_2_PIN) {
+    break;
+  #endif
+  #if HAS_TEMP_2
+    case TEMP_2_PIN:
     pin_index = TEMP_2;
-  }
-  else if (adc_pin == TEMP_3_PIN) {
+    break;
+  #endif
+  #if HAS_TEMP_3
+    case TEMP_3_PIN:
     pin_index = TEMP_3;
-  }
-  else if (adc_pin == TEMP_4_PIN) {
+    break;
+  #endif
+  #if HAS_TEMP_4
+    case TEMP_4_PIN:
     pin_index = TEMP_4;
-  }
-  else if (adc_pin == TEMP_BED_PIN) {
+    break;
+  #endif
+  #if HAS_TEMP_BED
+    case TEMP_BED_PIN:
     pin_index = TEMP_BED;
-  }
-#if ENABLED(FILAMENT_WIDTH_SENSOR)
-  else if (adc_pin == FILWIDTH_PIN) {
+    break;
+  #endif
+  #if ENABLED(FILAMENT_WIDTH_SENSOR)
+    case FILWIDTH_PIN:
     pin_index = FILWIDTH;
+    break;
+  #endif
   }
-#endif
 
   HAL_adc_result = (HAL_adc_results[(int)pin_index] >> 2)& 0x3ff; // shift to get 10 bits only.
 }