Digital Temperature Probe (DS18B20) – How to Use it?

Introduction:

The DS18B20 Digital temperature sensor provides 9 to 12-bit (configurable) temperature readings which indicate the temperature of the device. The DS18B20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor.In addition, the DS18B20 can derive power directly from the data line, eliminating the need for an external power supply.

Features:

• Usable temperature range: -55 to 125°C.
• 9 to 12 bit selectable resolution.
• Uses 1-Wire interface- requires only one digital pin for communication.
• Unique 64 bit ID burned into chip.
• Multiple sensors can share one pin.
• ±0.5°C Accuracy from -10°C to +85°C.
• Temperature-limit alarm system.
• Query time is less than 750ms.
• Usable with 3.0V to 5.5V power/data.

Components Required:

• Temperature Probe Sensor(DS18B20) 
• Arduino Uno 
• Jumper Wires 
• 4.7k Resistor

Usage:

This sensor is being widely used in various fields. This sensor has been included in many applications such as Thermostatic Controls,Industrial Systems, Consumer Products,Thermometers,Thermally Sensitive Systems.

Project For Reference:

Connections:

The Temperature sensor has 3 pins and it should be connected as follows:

• Vcc – 5V.
• Gnd – Gnd.
• Data – D2.
• Pull up resistor of value 4.7kohm between data and supply voltage.

Circuit Diagram:

Code:

#include <OneWire.h>

#include <DallasTemperature.h>

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

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

void setup(void)

{

  Serial.begin(9600);

  Serial.println("Arduino Digital Temperature");

  sensors.begin();

}

void loop(void)

{ 

  sensors.requestTemperatures();  

  Serial.print("Temperature is: ");

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

  delay(1000);

}