#define THERMISTOR A0            // Temp Sensor Pin
#define LED 5                    // LED Pin
#define BUZZER 6                 // Buzzer Pin
const float BETA = 3950;         // <As Per Data-Sheet> Should match the Beta Coefficient of the thermistor 

void setup() {
pinMode(THERMISTOR, INPUT);      // Setting Input Pin for Temp. Sensor
pinMode(LED, OUTPUT);            // Setting Output Pin for LED
pinMode(BUZZER, OUTPUT);         // Setting Output Pin for Buzzer

// Initializing Serial Monitor
Serial.begin(9600); 
Serial.println("----------------------------------------------------");
Serial.println("Arduino Nano Based Temperature Monitoring System");
Serial.println("----------------------------------------------------");
}

void loop() {  
  float alarmTemp = 38.00;
  int ledBrightnessMapped;       
  int tempAnalogValue = analogRead(THERMISTOR);
  float tempCelsius = 1 / (log(1 / (1023. / tempAnalogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;


  ledBrightnessMapped = map(tempAnalogValue,953,115,0,255);   // Mapping tempAnalogValue to 8-bit value
  analogWrite(LED,ledBrightnessMapped);           

  if (tempCelsius>=alarmTemp)           // Turning On Buzzer if current Temp is greater than alarm temp
    tone(BUZZER,1000);     
  else
    noTone(BUZZER);


// Displaying temperature
  Serial.print("Temperature: ");
  Serial.print(tempCelsius);
  Serial.print("°C");
  Serial.println();
  
}