[Arduíno] Testando One Wire 18B20

testeondewire18b20.ino

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

int SensorPin = 10;


OneWire ds(SensorPin);

void setup(void) {
  Serial.begin(9600);
}

void loop(void) {
  float temp = getTemp( );
  Serial.println("temperarua");
  Serial.println(temp);



  delay(100);

}


float getTemp(){

  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 -2000;
  }

  if ( addr[0] != 0x10 && addr[0] != 0x28) {
    Serial.print("Device is not recognized");
    return -3000;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);

  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE);


  for (int i = 0; i < 9; i++) {
    data[i] = ds.read();
  }

  ds.reset_search();

  byte MSB = data[1];
  byte LSB = data[0];

  float TRead = ((MSB << 8) | LSB);


  float Temperature = TRead / 16;

  if (data[1] == 0xFF)
  {
    Temperature = Temperature * -1;
  }

  return Temperature;

}