DS18B20 Temperature Sensor

เซ็นเซอร์วัดอุณหภูมิ แบบ Digital 1-Wire. วัดอุณหภูมิได้ตั้งแต่ -55°C to +125°C

File PDF >>> Link
Library OneWire >>> Link
Library dallas temperature control >>> Link
คู่มือการใช้งาน >>> Link

การต่อสายใช้งาน ดังนี้
- Red       >>> Vcc
- Yellow   >>> Signal
- Green    >>> GND
ให้ต่อ R ค่า 4.7k-10k คร่อมระหว่างขา Red กับ Yellow ด้วย

Example Code Test Temp.

#include

#include

// Data wire is plugged into port 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)

{

  // start serial port

  Serial.begin(9600);

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

  // Start up the library

  sensors.begin();

}

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 the device 1 (index 0) is: ");

  Serial.println(sensors.getTempCByIndex(0));  

  delay(500);

}

Example Code Temp On/Off Relay.

#include

#include

int Temp;

const int Relay = 8; // Digital output pin that the Relay is attached to

// Data wire is plugged into port 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(Relay, OUTPUT);

  digitalWrite(Relay, HIGH);

  // start serial port

  Serial.begin(9600);

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

  // Start up the library

  sensors.begin();

}

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");

  Temp = sensors.getTempCByIndex(0);

  Serial.print("Temperature for the device 1 (index 0) is: ");

  Serial.println(Temp); 

  if(Temp >= 60) {    // Relay OFF

    digitalWrite(Relay, HIGH);

  }

  else if(Temp <= 55) {    //Relay ON

    digitalWrite(Relay, LOW);

  }

}