temperature function

float getTemp(int tempSensorPin){ // converts from ADC reading to temperature

  // takes pin number, reads an analog value from it, and converts that to temperature in C

  const int B = 3470;       // all-important B value from thermistor datasheet
  const float T0 = 298.15;  // 'room temperature' in Kelvin (25C)

  int ADCvalue = analogRead(tempSensorPin); // get the value from the ADC

  float tKelvin = (B*T0)/(T0*log((1024.0/ADCvalue)-1)+B); // computer-simplified version of B parameter equation for NTCs
                                                          // thermistors are non-linear devices, so this corrects for that
                                                          // we don't have a 1:1 correspondence between temperature and resistance
  float tCelsius = tKelvin - 273.15;

  //Serial.println(tCelsius); // debug - shows current value of tCelsius

  return tCelsius;
  }