/*
  MSJ Researchers World
  Date - 22nd OCT 2024
  Mentor - Mr. Siranjeevi M
  Contact - 7373771991
*/

// Thermistor configuration
const int thermistorPin = A0; // Analog pin connected to thermistor
const float seriesResistor = 10000.0; // Value of fixed resistor (10kΩ)
const float nominalResistance = 10000.0; // Resistance of thermistor at 25°C
const float nominalTemperature = 25.0; // Nominal temperature (in °C)
const float bCoefficient = 3950.0; // Beta coefficient of the thermistor
const int adcResolution = 1023; // ADC resolution for Arduino Uno (0-1023)

// Function to read temperature
float getTemperature() 
{
  int adcValue = analogRead(thermistorPin); // Read raw ADC value
  float resistance = seriesResistor / ((adcResolution / (float)adcValue) - 1);
  float steinhart; // Variable to store temperature calculation

  steinhart = resistance / nominalResistance;   // R/Ro
  steinhart = log(steinhart);                   // ln(R/Ro)
  steinhart /= bCoefficient;                    // 1/B * ln(R/Ro)
  steinhart += 1.0 / (nominalTemperature + 273.15); // + (1/To)
  steinhart = 1.0 / steinhart;                  // Invert value
  steinhart -= 273.15;                          // Convert from Kelvin to °C

  return steinhart;
}

void setup() 
{
  Serial.begin(9600); // Initialize serial communication
}

void loop() 
{
  float temperature = getTemperature(); // Get the temperature value
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  delay(1000); // Wait 1 second between readings
}