Has not been tested with thermistor as I didn't have the hardware.
Testing with a hardcoded positive number works.

@@ -59,3 +59,3 @@
     check_eeprom_is_ready();
     if (fan_num == 1){
-        eeprom_update_byte(current_address_fan1, byte);
+        eeprom_write_byte(0x30, byte);

@@ -60,3 +60,3 @@
     if (fan_num == 1){
-        eeprom_update_byte(current_address_fan1, byte);
+        eeprom_write_byte(0x30, byte);
         current_address_fan1++;

@@ -100,0 +105,4 @@
+    
+    if (fan_num == 1){
+        check_eeprom_is_ready();
+        return eeprom_read_byte(0x30 + pos);

@@ -41,3 +41,4 @@
 // Reads all the dataPoints form EEPROM
 uint8_t read_data_point_speed_info(uint8_t fan_num, uint8_t *array);
 
+uint8_t read_single_data_point_speed_info(uint8_t fan_num, uint8_t pos);