DS18B20 Sensor de temperatura a prova de água

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS A4
#define TEMPERATURE_PRECISION 9 // Lower resolution

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);

int numberOfDevices; // Number of temperature devices found

DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address

void setup(void)
{
  // start serial port
  Serial.begin(115200);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
  
  // Grab a count of devices on the wire
  numberOfDevices = sensors.getDeviceCount();
  
  // locate devices on the bus
  //Serial.print("Locating devices...");
  
  //Serial.print("Found ");
  Serial.print(numberOfDevices, DEC);
  //Serial.println(" devices.");

  // report parasite power requirements
  //Serial.print("Parasite power is: "); 
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");
  
  // Loop through each device, print out address
  for(int i=0;i<numberOfDevices; i++)
  {
    // Search the wire for address
    if(sensors.getAddress(tempDeviceAddress, i))
  {
    //Serial.print("Found device ");
    Serial.print(i, DEC);
    //Serial.print(" with address: ");
    printAddress(tempDeviceAddress);
    //Serial.println();
    
    Serial.print("Setting resolution to ");
    Serial.println(TEMPERATURE_PRECISION, DEC);
    
    // set the resolution to TEMPERATURE_PRECISION bit (Each Dallas/Maxim device is capable of several different resolutions)
    sensors.setResolution(tempDeviceAddress, TEMPERATURE_PRECISION);
    
    Serial.print("Resolution actually set to: ");
    Serial.print(sensors.getResolution(tempDeviceAddress), DEC); 
    Serial.println();
  }else{
    Serial.print("Found ghost device at ");
    Serial.print(i, DEC);
    Serial.print(" but could not detect address. Check power and cabling");
  }
  }

}

// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  // method 1 - slower
  //Serial.print("Temp C: ");
  //Serial.print(sensors.getTempC(deviceAddress));
  //Serial.print(" Temp F: ");
  //Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit

  // method 2 - faster
  float tempC = sensors.getTempC(deviceAddress);
  if(tempC == DEVICE_DISCONNECTED_C) 
  {
    Serial.println("Error: Could not read temperature data");
    return;
  }
  Serial.print("Temp C: ");
  Serial.print(tempC, 6);
  Serial.print(" Temp F: ");
  Serial.println(DallasTemperature::toFahrenheit(tempC),6); // Converts tempC to Fahrenheit
}

void loop(void)
{ 
  // call sensors.requestTemperatures() to issue a global temperature 
  // request to all devices on the bus
  //Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  //Serial.println("DONE");
  
  
  // Loop through each device, print out temperature data
  for(int i=0;i<numberOfDevices; i++)
  {
    // Search the wire for address
    if(sensors.getAddress(tempDeviceAddress, i))
  {
    // Output the device ID
    //Serial.print("Temperature for device: ");
    //Serial.println(i,DEC);
    
    // It responds almost immediately. Let's print out the data
    printTemperature(tempDeviceAddress); // Use a simple function to print out the data
  } 
  //else ghost device! Check your power requirements and cabling
  
  }
}

// function to print a device address
void printAddress(DeviceAddress deviceAddress)
{
  for (uint8_t i = 0; i < 8; i++)
  {
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}