#include <Arduino.h>
#include <OneWire.h>

float Temp_Buffer = 0;  // 定义温度浮点型变量

OneWire  ds(10);         // 定义DS18B20数据口连接arduino的10号IO上

#define DebugSerial Serial      //定义程序调试接在串口1

void setup() 
{       
	DebugSerial.begin(9600);
	DebugSerial.println("setup end!");
  pinMode(10,OUTPUT);
  digitalWrite(10,LOW);

}

void loop() 
{
	  /****************************************DS18B20温度*****************************************************/ 
	   Temp_Buffer = readDs18b20();//读取温度值

	  //串口调试DS18B20温度输出信息
	  DebugSerial.print("Temp = ");
	  DebugSerial.println(Temp_Buffer);    	
    digitalWrite(10,HIGH);
}
float readDs18b20()
{
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius, fahrenheit;
   
  if ( !ds.search(addr)) {
     //Serial.println("No more addresses.");
     //Serial.println();
    ds.reset_search();
    delay(250);
    // return 0;
  }
  
//   Serial.print("ROM =");
//  for( i = 0; i < 8; i++) {
//    Serial.write(' ');
//    Serial.print(addr[i], HEX);
//  }
 
  if (OneWire::crc8(addr, 7) != addr[7]) {
//      Serial.println("CRC is not valid!");
      return 0;
  }
//  Serial.println();
  
  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
//      Serial.println("  Chip = DS18S20");  // or old DS1820
//      type_s = 1;
//     break;
    case 0x28:
//      Serial.println("  Chip = DS18B20");
//      type_s = 0;
      break;
   case 0x22:
//     Serial.println("  Chip = DS1822");
//      type_s = 0;
      break;
    default:
//      Serial.println("Device is not a DS18x20 family device.");
      return 0;
  } 
 
  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);         // start conversion, with parasite power on at the end
   
  delay(1000);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.
   
  present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);         // Read Scratchpad
 
 // Serial.print("  Data = ");
 // Serial.print(present,HEX);
//  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
 //   Serial.print(data[i], HEX);
 //   Serial.print(" ");
  }
 // Serial.print(" CRC=");
  Serial.print(OneWire::crc8(data, 8), HEX);
 // Serial.println();
 
  // convert the data to actual temperature
 
  unsigned int raw = (data[1] << 8) | data[0];
  if (type_s) {
    raw = raw << 3; // 9 bit resolution default
    if (data[7] == 0x10) {
      // count remain gives full 12 bit resolution
      raw = (raw & 0xFFF0) + 12 - data[6];
    }
  } else {
    byte cfg = (data[4] & 0x60);
    if (cfg == 0x00) raw = raw << 3;  // 9 bit resolution, 93.75 ms
    else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms
    else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms
    // default is 12 bit resolution, 750 ms conversion time
  }
  celsius = (float)raw / 16.0;
  fahrenheit = celsius * 1.8 + 32.0;
//  Serial.print("  Temperature = ");
//  Serial.print(celsius);
//  Serial.print(" Celsius, ");   
//  Serial.print(fahrenheit);
//  Serial.println(" Fahrenheit");
//  
//  
//  Serial.println(celsius,1);

  return celsius;
}