아두이노와 온도센서(18B20) 활용한 물온도 센싱

 #include <OneWire.h>

#include <DallasTemperature.h>

// Data wire is plugged into pin 2 on the Arduino

#define ONE_WIRE_BUS 2

// 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);

void setup(void)

{

  pinMode(11,OUTPUT);

  pinMode(12,OUTPUT);

  pinMode(13,OUTPUT);

  // start serial port

  Serial.begin(9600);

  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library

  sensors.begin(); // IC Default 9 bit. If you have troubles consider upping it 12. Ups the delay giving the IC more time to process the temperature measurement

}

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");

  //Serial.print("Temperature for Device 1 is: ");

  float temperature = sensors.getTempCByIndex(0); // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire

  if(temperature >= 38)

  {

    digitalWrite(11,HIGH);

    digitalWrite(12,LOW);

    digitalWrite(13,LOW);

  }

  else if(temperature < 38 && temperature > 35)

  {

    digitalWrite(11,LOW);

    digitalWrite(12,HIGH);

    digitalWrite(13,LOW);

  }

  else

  {

    digitalWrite(11,LOW);

    digitalWrite(12,LOW);

    digitalWrite(13,HIGH);

  }

}