float beta=3950;
int temp;
  int t;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  
  }

void loop() {
  // put your main code here, to run repeatedly:
  int reading=analogRead(A4); //reading the senzor value

 // converting reading into celcius
  temp=1 / (log(1 / (1023. / reading - 1)) / beta + 1.0 / 298.15) - 273.15;
int t=temp/5;
 switch (t) {
   case 3:
    Serial.println("temperature is in 15-19 range");
    break;
    case 4:
    Serial.println("temperature is in 20-24 range");
    break;
    case 5:
      Serial.println("temperature is in 25-29 range");
      break;
    case 6:
      Serial.println("temperature is in 30-34 range");
      break;
    case 7:
      Serial.println("temperature is in 35-39 range");
      break;
    case 8:
    Serial.println("temperature is in 40-45 range");
    break;
    
  }
  delay(2000);
}