Controlling the state of 8-relays by thermistors

#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

// KNOWN ROMs (IDs of Thermistors)    //
// 28FF988B8141CD // 28ff988b8141cd   //
// 28FFAC6D68142BC // 28ffac6d68142bc //
// 28FFE6746814243 // 28ffe6746814243 //
// 28FFD96F681424 // 28ffd96f681424   //
// 28FF734B814175 // 28ff734b814175   //
// 28FF7BB66814378 // 28ff7bb66814378 //
// 28FF8758691438 // 28ff8758691438   //
// 28FF57BB81418 // 28ff57bb81418     //
////////////////////////////////////////

OneWire  ds(10);  // on pin 10 (a 4.7K resistor is necessary)

void setup() {
  Serial.begin(9600);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
}

void loop() {

  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];
  float celsius;
  String aa;
  String ab;
  String xx;
  String check;

  if ( !ds.search(addr)) {
    Serial.println("No more addresses.");
    Serial.println();
    ds.reset_search();
    delay(0);
    return;
  }

  if (OneWire::crc8(addr, 7) != addr[7]) {
      Serial.println("CRC is not valid!");
      return;
  }
 // Serial.println();

  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      aa = "Chip = DS18S20,";  // or old DS1820
      type_s = 1;
      break;
    case 0x28:
      aa = "Chip = DS18B20,";
      type_s = 0;
      break;
    case 0x22:
      aa = "Chip = DS1822,";
      type_s = 0;
      break;
    default:
      aa = "Device is not a DS18x20 family device.";
      return;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1);        // start conversion, with parasite power on at the end

  delay(750);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.

  aa += " Data = ";

  present = ds.reset();
  ds.select(addr);
  ds.write(0xBE);         // Read Scratchpad
  aa += String(present, HEX);

  //Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    aa += String(data[i], HEX);
   // Serial.print(" ");
  }
  aa += ", CRC = ";
  aa += String(OneWire::crc8(data, 8), HEX);

  //Serial.print
 // Serial.println();

  // Convert the data to actual temperature
  // because the result is a 16 bit signed integer, it should
  // be stored to an "int16_t" type, which is always 16 bits
  // even when compiled on a 32 bit processor.
  int16_t 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);
    // at lower res, the low bits are undefined, so let's zero them
    if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms
    else if (cfg == 0x20) raw = raw & ~3; // 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;
  aa += (", Temperature = ");
  aa += (celsius);
  aa += (" celsius, ");

  delay(0);

  aa += "ROM = ";
  for( i = 0; i < 8; i++) {
    //Serial.write(' '); // <- this can be used to add spaces

      // Checking if any of temp is higher than 30 degree C
      check += String(addr[i], HEX);

  }

      if (check == "28ff988b8141cd" && celsius >= 30.00) { digitalWrite(2, LOW); } else { digitalWrite(2, HIGH); }
      if (check == "28ffac6d68142bc" && celsius >= 30.00) { digitalWrite(3, LOW); } else { digitalWrite(3, HIGH); }
      if (check == "28ffe6746814243" && celsius >= 30.00) { digitalWrite(4, LOW); } else { digitalWrite(4, HIGH); }
      if (check == "28ffd96f681424" && celsius >= 30.00) { digitalWrite(5, LOW); } else { digitalWrite(5, HIGH); }
      if (check == "28ff734b814175" && celsius >= 30.00) { digitalWrite(6, LOW); } else { digitalWrite(6, HIGH); }
      if (check == "28ff7bb66814378" && celsius >= 30.00) { digitalWrite(7, LOW); } else { digitalWrite(7, HIGH); }
      if (check == "28ff8758691438" && celsius >= 30.00) { digitalWrite(8, LOW); } else { digitalWrite(8, HIGH); }
      if (check == "28ff57bb81418" && celsius >= 30.00) { digitalWrite(9, LOW); } else { digitalWrite(9, HIGH); }

    aa += check;

  Serial.print(aa);
  Serial.println();
}