Sensor_Temp_e_Fluxo

#include <OneWire.h>
int DS18S20_Pin = 3; //DS18S20 Signal pin on digital 3
OneWire ds(DS18S20_Pin); // on digital pin 3

int NbTopsFan; int Calc;                //Varibles used for calculations
int hallsensor = 2; typedef struct      //The pin location of the sensor
{
  char fantype;
  unsigned int fandiv;
} fanspec;
fanspec fanspace[3] = {{0, 1}, {1, 2}, {2, 8}}; char fan = 1;
//-------------------------------------------
void setup(void)
{
  Serial.begin(9600);
  pinMode(hallsensor, INPUT);
  attachInterrupt(0, rpm, RISING);
}
//---------------------------------
void rpm ()
//This is the function that the interupt calls
{
  NbTopsFan++;
}
//------------------------------------------
void loop(void)
{
  float temperature = getTemp();
  Serial.println(temperature);
  delay(2000);                    //just here to slow down the output so it is easier to read

  NbTopsFan = 0;                  //Set NbTops to 0 ready for calculations
  sei();                          //Enables interrupts
  delay (1000);                   //Wait 1 second
  cli();                          //Disable interrupts
  Calc = ((NbTopsFan * 60) / fanspace[fan].fandiv);
  Serial.print (Calc, DEC);       //Prints the number calculated above
  Serial.print (" rpm\r\n");      //Prints " rpm" and a new line
}
//--------------------------------------------
float getTemp()                   //returns the temperature from one DS18S20 in DEG Celsius
{
  byte data[12];
  byte addr[8];
  if ( !ds.search(addr))          //no more sensors on chain, reset search
  {
    ds.reset_search();
    return -1000;
  }
  if ( OneWire::crc8( addr, 7) != addr[7])
  {
    Serial.println("CRC is not valid!");
    return -1000;
  }
  if ( addr[0] != 0x10 && addr[0] != 0x28)
  {
    Serial.print("Device is not recognized");
    return -1000;
  }
  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1);                    // start conversion, with parasite power on at the end
  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE);                       // Read Scratchpad
  for (int i = 0; i < 9; i++)           // we need 9 bytes
  {
    data[i] = ds.read();
  }
  ds.reset_search();
  byte MSB = data[1];
  byte LSB = data[0];
  float tempRead = ((MSB << 8) | LSB);    //using two's compliment
  float TemperatureSum = tempRead / 16;
  return TemperatureSum;
}