WorkingThermisistorCode

#include <Arduino.h>

// ---- Constants ----
const int THERM_PIN = A0;

const float VREF = 5.0;        // change to 3.3 if needed
const float ADC_MAX = 16383.0;  // 10-bit ADC

const float R_FIXED = 100000.0;  // 100k resistor
const float R0 = 100000.0;       // 100k at 25C
const float T0 = 298.15;         // 25C in Kelvin
const float BETA = 3950.0;       // beta value

void setup() {
  Serial.begin(115200);
  analogReadResolution(14);

}

void loop() {
  // Read ADC
  int adc = analogRead(THERM_PIN);

  // Convert ADC to voltage
  float voltage = (adc / ADC_MAX) * VREF;

  // Convert voltage to thermistor resistance
  float r_ntc = R_FIXED * voltage / (VREF - voltage);

  // Beta equation: solve for temperature
  float tempK = 1.0 / ( (1.0 / T0) + (1.0 / BETA) * log(r_ntc / R0) );
  float tempC = tempK - 273.15;

  // Print results
  Serial.print("ADC: ");
  Serial.print(adc);
  Serial.print("  R_ntc: ");
  Serial.print(r_ntc, 0);
  Serial.print(" ohms  Temp: ");
  Serial.print(tempC, 2);
  Serial.println(" C");

  delay(1000);
}