#include <OneWire.h>

// OneWire DS18S20, DS18B20, DS1822 Temperature Example
//
// http://www.pjrc.com/teensy/td_libs_OneWire.html
//
// The DallasTemperature library can do all this work for you!
// http://milesburton.com/Dallas_Temperature_Control_Library

OneWire  ds(0);  // on pin 10 (a 4.7K resistor is necessary)
int relay = 1;
int threshold = 480; //320=equals 20 degrees 30=480
int temp;

void setup(void) {
  pinMode(relay, OUTPUT);
}

void loop(void) {
  //digitalWrite(relay, HIGH);
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  
  if ( !ds.search(addr)) {
    ds.reset_search();
    delay(250);
    return;
  }
  
  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

  for ( i = 0; i < 9; i++) {           
    // we need 9 bytes
    data[i] = ds.read();
  }
  temp=(data[1]*256)+data[0];
  if (temp>threshold) {
    digitalWrite(relay, HIGH);
  } else {
    digitalWrite(relay, LOW);
  }
  delay(30000);
}