Arduino Temperature Sensor Web Server


Welcome to the world of Arduino temperature sensor web servers! In this article, we will explore how to create a simple web server using an Arduino board and a temperature sensor. This project is a great way to learn about both Arduino programming and web development. So, grab your Arduino board, temperature sensor, and let’s get started!

What is Arduino?

Arduino is an open-source electronics platform based on easy-to-use hardware and software. It allows anyone, from beginners to experienced professionals, to create interactive projects. Arduino boards are equipped with microcontrollers that can be programmed to read inputs from various sensors and control outputs such as lights, motors, and displays.

What is a Temperature Sensor?

A temperature sensor is a device that measures the temperature of its surroundings. It converts the temperature into an electrical signal, which can be read by a microcontroller. There are various types of temperature sensors available, such as thermocouples, thermistors, and digital temperature sensors.

Setting up the Hardware

Before we dive into the code, let’s first set up the hardware components. You will need an Arduino board (such as Arduino Uno), a temperature sensor (such as LM35), a breadboard, and some jumper wires.

Start by connecting the temperature sensor to the Arduino board. Connect the VCC pin of the temperature sensor to the 5V pin on the Arduino, the GND pin to the GND pin, and the output pin to any analog input pin (e.g., A0).

Installing the Libraries

To communicate with the temperature sensor and create a web server, we need to install some libraries. Open the Arduino IDE and go to “Sketch” -> “Include Library” -> “Manage Libraries.” Search for “Ethernet” and install the Ethernet library by Arduino. Next, search for “Adafruit Sensor” and install the Adafruit Sensor library.

Creating the Web Server

Now that our hardware is set up and libraries are installed, let’s start coding. Open a new sketch in the Arduino IDE and let’s begin by including the necessary libraries.




Next, we need to define some variables for the temperature sensor pin and the MAC address of the Ethernet shield.

const int temperaturePin = A0;

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

In the setup function, we initialize the Ethernet shield and start the serial communication.

void setup() {



  Serial.print("Server IP: ");



In the loop function, we read the temperature from the sensor and display it on the serial monitor.

void loop() {

  int sensorValue = analogRead(temperaturePin);

  float voltage = sensorValue * (5.0 / 1023.0);

  float temperature = (voltage - 0.5) * 100;

  Serial.print("Temperature: ");


  Serial.println(" °C");



Accessing the Web Server

Now that our web server is up and running, we can access it using a web browser. Open your favorite browser and enter the IP address of your Arduino board (which should be displayed on the serial monitor) in the address bar. Press enter, and you should see a webpage displaying the current temperature.


Congratulations! You have successfully created an Arduino temperature sensor web server. This project combines the worlds of electronics and web development, allowing you to remotely monitor temperature readings. Feel free to explore further by adding more sensors, creating a more advanced web interface, or integrating the data with other applications. Happy tinkering!

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