Temperature Monitoring System With DS18B20 And Arduino
Temperature Monitoring System Using Arduino
Components Required
Circuit Connections
Applications
Conclusion

Published November 5, 2025

Temperature Monitoring System With DS18B20 And Arduino

Hey guys, welcome back to. In this article, we are going to make a Temperature Monitoring System with a

IntermediateFull instructions provided5 hours309

Temperature Monitoring System With DS18B20 And Arduino

Things used in this project

Hardware components

Arduino UNO

Adafruit Waterproof DS18B20 Digital temperature sensor

USB cable for uploading the code

12C LCD Module

16×2 LCD

Jumper wires (generic)

Breadboard (generic)

Multi-Turn Precision Potentiometer- 10k ohms (25 Turn)

DFRobot I2C 16x2 Arduino LCD Display Module

Story

Temperature Monitoring System With DS18B20 And Arduino

Temperature Monitoring System Using Arduino

Monitoring temperature is an important part of many science and engineering projects. From industrial machines to daily household appliances, temperature sensors play a key role in maintaining safety and efficiency. In this project, we will learn how to make a simple Temperature Monitoring System using Arduino, a temperature sensor, and an LCD display. This system can measure the surrounding temperature and show real-time readings in both Celsius and Fahrenheit. It’s a great project for beginners who want to learn about sensors, Arduino programming, and basic electronics.

Components Required

To build this project, you will need the following components:

Arduino Uno board

Arduino Uno board

LM35 or DS18B20 temperature sensor

LM35 or DS18B20 temperature sensor

16×2 LCD display

16×2 LCD display

Breadboard and jumper wires

Breadboard and jumper wires

USB cable for programming

USB cable for programming

Two bowls or containers for hot and cold water (for testing)

Two bowls or containers for hot and cold water (for testing)

The LM35 sensor is very popular because it provides accurate temperature readings and gives an output directly in Celsius. It produces 10 mV per degree Celsius, making it easy to interface with the Arduino’s analog pin.

Circuit Connections

The wiring for this project is simple. Connect the VCC pin of the LM35 to the 5V pin of the Arduino, the GND pin to the ground, and the output pin to the A0 analog input of the Arduino. For the LCD display, connect it using 4-bit mode. The RS pin of the LCD goes to Arduino digital pin 12, the Enable pin to pin 11, and data pins D4 to D7 are connected to pins 5, 4, 3, and 2 respectively. A 10k potentiometer can be used to adjust the LCD contrast.

Once all the connections are complete, mount everything on a breadboard neatly. Make sure the sensor is away from heat sources to avoid wrong readings during setup.

Working of the Project

When the system is powered on, the Arduino reads the temperature continuously from the sensor. The LCD shows the live readings in both Celsius and Fahrenheit. You can test the system by placing the sensor in hot and cold water. The temperature value will increase or decrease depending on the environment.

Applications

This simple project can be used in many real-life situations, such as:

Room or environment temperature monitoring

Room or environment temperature monitoring

Water heater temperature control

Water heater temperature control

Food processing units

Food processing units

Smart agriculture systems

Smart agriculture systems

Conclusion

The Temperature Monitoring System using Arduino is an excellent beginner-friendly project that teaches how sensors interact with microcontrollers. It helps students understand the concept of analog data, real-time monitoring, and display interfacing. With small modifications, you can add features like data logging, wireless monitoring, or automatic fan control. This simple experiment shows how powerful and practical Arduino can be for developing real-world electronic solutions.

Untitled file

// OneWire LIBRARY   
  // https://github.com/PaulStoffregen/OneWire   
  // DallasTemperature LIBRARY   
  // https://github.com/milesburton/Arduino-Temperature-Control-Library   
  // I2C LIBRARY  
  //https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library  
 #include <OneWire.h>  
 #include <DallasTemperature.h>  
 #include <Wire.h>   
 #include <LiquidCrystal_I2C.h>  
 LiquidCrystal_I2C lcd(0x27,16,2);   
 #define ONE_WIRE_BUS 5  
 OneWire oneWire(ONE_WIRE_BUS);  
 DallasTemperature sensors(&oneWire);  
  float Celcius=0;  
  float Fahrenheit=0;  
 void setup(void)  
 {  
  Serial.begin(9600);  
  sensors.begin();  
  lcd.init();             
  lcd.backlight();  
  lcd.print("Temp Monitoring");  
 }  
 void loop(void)  
 {   
  sensors.requestTemperatures();   
  Celcius=sensors.getTempCByIndex(0);  
  Fahrenheit=sensors.toFahrenheit(Celcius);  
  Serial.print(" C ");  
  Serial.print(Celcius);  
  Serial.print(" F ");  
  Serial.println(Fahrenheit);  
   lcd.setCursor(0, 1);  
   lcd.print(Celcius);  
   lcd.setCursor(6, 1);  
   lcd.print("C");  
   lcd.setCursor(9, 1);  
   lcd.print(Fahrenheit);  
   lcd.setCursor(15, 1);  
   lcd.print("F");  
  delay(1000);  
 }  
Code for without I2C module

// OneWire LIBRARY   
  // https://github.com/PaulStoffregen/OneWire   
  // DallasTemperature LIBRARY   
  // https://github.com/milesburton/Arduino-Temperature-Control-Library   
 #include <OneWire.h>  
 #include <DallasTemperature.h>  
 #include "LiquidCrystal.h"  
 LiquidCrystal lcd(5,6,7,8,9,10);  
 #define ONE_WIRE_BUS 5  
 OneWire oneWire(ONE_WIRE_BUS);  
 DallasTemperature sensors(&oneWire);  
  float Celcius=0;  
  float Fahrenheit=0;  
 void setup(void)  
 {  
  Serial.begin(9600);  
  sensors.begin();  
  lcd.begin(16,2);  
  lcd.print("Temp Monitoring");  
 }  
 void loop(void)  
 {   
  sensors.requestTemperatures();   
  Celcius=sensors.getTempCByIndex(0);  
  Fahrenheit=sensors.toFahrenheit(Celcius);  
  Serial.print(" C ");  
  Serial.print(Celcius);  
  Serial.print(" F ");  
  Serial.println(Fahrenheit);  
   lcd.setCursor(0, 1);  
   lcd.print(Celcius);  
   lcd.setCursor(6, 1);  
   lcd.print("C");  
   lcd.setCursor(9, 1);  
   lcd.print(Fahrenheit);  
   lcd.setCursor(15, 1);  
   lcd.print("F");  
  delay(1000);  
  }