ds18b20 temperature sensor arduino

DS18B20 Temperature Sensor Arduino: A Comprehensive Guide

Table of Contents:

  1. Introduction
  2. Working Principle
  3. Arduino Connection
  4. Coding
  5. Applications
  6. Conclusion


Welcome to this comprehensive guide on using the DS18B20 temperature sensor with Arduino. In this article, we will explore the working principle of the DS18B20 sensor, how to connect it to an Arduino board, and how to code it for accurate temperature measurements. Additionally, we will discuss the various applications of this sensor in real-world projects.

Working Principle

The DS18B20 is a digital temperature sensor that uses the 1-Wire protocol for communication. It is capable of measuring temperatures from -55°C to +125°C with a high accuracy of ±0.5°C. The sensor contains a unique ROM code, which allows multiple sensors to be connected to a single data line.

The DS18B20 operates by converting the temperature into a digital signal using its internal analog-to-digital converter. It employs the Dallas Semiconductor’s unique one-wire bus, which requires only one data line for communication with the Arduino.

Arduino Connection

Connecting the DS18B20 sensor to an Arduino is relatively simple. Follow the steps below:

  1. Connect the VCC pin of the DS18B20 to the 5V pin of the Arduino.
  2. Connect the GND pin of the DS18B20 to the GND pin of the Arduino.
  3. Connect the data pin of the DS18B20 to a digital pin (e.g., pin 2) of the Arduino.

Ensure that you have inserted a 4.7kΩ pull-up resistor between the VCC and data pin of the DS18B20 sensor to ensure stable communication.


Next, we will write a simple Arduino code to read the temperature values from the DS18B20 sensor and display them on the serial monitor. Here’s the code:

#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
void setup() {
void loop() {
  float temperatureC = sensors.getTempCByIndex(0);
  Serial.print("Temperature: ");

Make sure that you have installed the required libraries: “OneWire” and “DallasTemperature”. You can find these libraries in the Arduino Library Manager.


The DS18B20 temperature sensor has a wide range of applications. Some of them include:

  • Environmental monitoring systems
  • Industrial process control
  • Home automation
  • Weather stations
  • Aquarium temperature monitoring

The accuracy, waterproof design, and ease of use make the DS18B20 sensor a popular choice in various projects.


In conclusion, the DS18B20 temperature sensor is a versatile component that can be easily integrated with Arduino boards. By following the instructions provided in this guide, you should be able to connect the sensor, write the necessary code, and obtain accurate temperature readings. Explore the numerous applications of this sensor in your own projects and enhance your understanding of temperature sensing in the digital realm.

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