Arduino 串口输出LM35温度

#include "stdlib.h"
float temp = 0.0;
float maxtemp = 0.0;
float mintemp =100.0;

// the setup routine runs once when you press reset:
void setup() {
Serial.begin();
Serial.println(F("reading temperature begin. \n")); 

}

// the loop routine runs over and over again forever:
void loop() {

  static unsigned long sensortStamp = ;

  if(millis() - sensortStamp > ){
    sensortStamp = millis();
    // read the LM35 sensor value and convert to the degrees every 100ms.

    int reading = analogRead(); //把LM35的输出端连接到了A0，所以这里是analogRead(0)
    temp = reading *0.0048828125*;
    if(temp >= maxtemp)
      maxtemp = temp;
    if(temp <= mintemp)
       mintemp = temp;
    Serial.print(F("Real Time Temp: "));
    Serial.print(temp);
    Serial.print(F(" Max Temp: "));
    Serial.print(maxtemp);
    Serial.print(F("  Min Temp: "));
    Serial.println(mintemp);
  }

}