#include <OneWire.h>
#include <DallasTemperature.h>

// 数据输出脚接开发板数字引脚2
#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup(void)
{
  pinMode(9, INPUT);
  //pinMode(13, OUTPUT);
  Serial.begin(9600);
  sensors.begin();
}

void loop(void)
{ 
  int flag = 0;
  flag = digitalRead(9);
  Serial.print(" Value of switch = ");
  Serial.println(flag); 
  sensors.requestTemperatures(); // 发送命令获取温度
  Serial.print("\nTemperature for the device 1 (index 0) is: ");
  int tc = sensors.getTempCByIndex(0);
  int tf = tc *1.8 +32;
  if (flag)
    Serial.println(tf); 
  else
    Serial.println(tc);
  delay(500); 
}