[Mikesolar]

Here is the current code which is purely a copied code from the Adafruit site "using a thermister". Then, I added the last line from Jeffs approach in bold. It seems to ignore the added code and continues to post in ohms. I am looking for a reason for this but the program doesn't come up with any errors.

// the value of the 'other' resistor
#define SERIESRESISTOR 10000    
 
// What pin to connect the sensor to
#define THERMISTORPIN A0 
 
void setup(void) {
  Serial.begin(9600);
}
 
void loop(void) {
  float reading;
 
  reading = analogRead(THERMISTORPIN);
 
  Serial.print("Analog reading "); 
  Serial.println(reading);
 
  // convert the value to resistance
  reading = (1023 / reading)  - 1;
  reading = SERIESRESISTOR / reading;
  Serial.print("Thermistor resistance "); 
  Serial.println(reading);
  
  float logcubed = log(reading);
logcubed = logcubed * logcubed * logcubed;
float kelvin = 1.0 / (-7.5e-4 + 6.23e-4 * log(reading) - 1.73e-6 * (logcubed));
float celsius = kelvin - 273.15;
 
  delay(1000);
}