#include <SoftwareSerial.h>


#define TX    0  
#define RX    1  

const float R1 = 100000;

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

void loop() {
  float val,V,R,T;

  val = analogRead(A3);
  V = 5*val/1024;
  R = V*R1/(5-V);

  float y = 4076.6/(log(R)+2.11);

  T=y-273;
  
  Serial.println(T);
  delay(500);
}