#define in1 A0

float temp1, lectura1;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(in1, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  lectura1 = analogRead(in1);
  temp1 = (lectura1 * 5000 / 1023 / 10) - 40;
  Serial.print(temp1);


  delay(800);
}