#define TEMP A0
void setup()
{
  Serial.begin (9600);
}
void loop()
{
  int reading=analogRead (TEMP);
  float voltage=reading*5.0/1024.0;
  float temperature=voltage*100;
  Serial.print("temperature:");
  Serial.print(temperature);
  Serial.println("*c");
  delay(1000);
}