int Vo;
float R1 = 100000;
float logR2, R2, TEMPERATURA;
float c1=2.114990448e-03, c2=0.3823381228e-04, c3=5.228061052e-07;

void setup(){
  Serial.begin(9600);
}

void loop(){
  Vo = analogRead(A0);
  R2 = R1*(1023.0/(float)Vo -1.0);
  logR2 = log(R2);
  TEMPERATURA =   (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
  TEMPERATURA = TEMPERATURA - 273.15;
  Serial.print("Temperatura: ");
  Serial.print(TEMPERATURA);
  Serial.println(" C");
  delay(1500);
}