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In this project, we will be logging data to database using Arduino Ethernet shield. We will store the data of the DHT22 temperature and humidity sensor in the database and we will then show this on the webpage. For creating the database, we will use the Xampp server and we will then send the data from the Arduino using the Ethernet shield to the database. This data will get stored in the database and we can access this data anytime we want. We will also create a webpage that will show this data.

Required Components

The components required for logging data to database using Arduino Ethernet shield are as follows

  • Arduino Uno
  • Arduino Ethernet Shield
  • DHT22 Temperature and Humidity sensor
  • Connecting Wires
  • Breadboard

Skills Required

The skills you require logging data to database using Arduino Ethernet shield are as follows

  • Arduino IDE
  • HTML
  • PHP

Getting Started

Step 1          Installing and Setting the Xampp

1. The first step you need to do is to install Xampp. Go to the below link and install it from there.


After installing it, run the Xampp as administrator by right clicking on it and selecting run as administrator as shown in below picture.

Run xampp as admin.png

2. After running it, click on config button next to apache and select “Apache (httpd.config)” as shown below.

Xampp port selection.png

3. A notepad file will open, change the port written next to word “listen” from 80 to 8095. The reason of why we need to change the port is that the port 80 is sometimes used by other applications so it will cause error. Therefore, we have selected a separate port to avoid any error.

change port.PNG

4. After that, click on config button in the top right corner as highlighted in the below figure

press config button.PNG

5. While pressing the config button, a window will open; check the mysql and apache boxes as shown below

check boxes.PNG

6. After doing all the above steps, restart you PC and run again the Xampp as administrator. You will see the apache and mysql service started.

apache and mysql started.PNG

Step 2

Creating the Database

Open your browser and type “localhost:8095/phpmyadmin/”. It will ask for a username and password, the default username is “root” and leave the password as blank. After giving the username and password, it will open the phpmyadmin.

Then go to databases tab and create the new database. I have created the database with the name “ethernet” as shown below

create database.PNG

Then go to SQL tab next to databases tab and paste the below code there. It will create a table where we will enter the data of the sensors from the Arduino.

CREATE TABLE `ethernet`.`data` (
`temperature` VARCHAR( 10 ) NOT NULL,
`humidity` VARCHAR( 10 ) NOT NULL,
`heat_index` VARCHAR( 10 ) NOT NULL


Step 3

Creating the PHP pages

Now we are going to create the php pages which will help in making connection between the Arduino and the Database.

1. First go to C:\xampp\htdocs and create a new folder named ‘ethernet’. Create a new text file in this folder and save the name as ‘connection.php’. Paste the below code there and save the file. This PHP file will make a connection between the Arduino and the database.

$username = "root";
$pass = "";
$host = "localhost";
$db_name = "ethernet";
$con = mysqli_connect ($host, $username, $pass);
$db = mysqli_select_db ( $con, $db_name );

2. Then create a new text file and save the name as ‘data.php’. Paste the below code there and save it. This PHP file will log the data into the database from the Arduino.

include ('connection.php');
$sql_insert = "INSERT INTO data (temperature, humidity, heat_index) VALUES ('".$_GET["temperature"]."', '".$_GET["humidity"]."', '".$_GET["heat_index"]."')";
echo "Done";
echo "error is ".mysqli_error($con );

3.  Lets Try by Manually sending the data to the database.
You can manually check that if the database is receiving the data from these pages or not or you can say that if the connection between the database and these pages is made or not. To check that, place the below line in your browser


After entering the above line in your browser, if “Done” will be shown, then it means that the values are stored in the database. You can see these by going into the data base.

At this Point, You have successfully made the connection between the database and the web page. Now lets make a connection between the Arduino and the database.

Step 4

Sending Data from Arduino

Now, we are going to send the data from Arduino to the database.

Make the connections of the DHT22 with the Arduino as shown in the figure below

To read more about interfacing DHT22 with Arduino, read this Tutorial | Temperature and Humidity Sensor DHT22 Interfacing with Arduino

DHT22 with arduino_bb.png

Arduino Code

Download the DHT22 library from the below link. No need to download the Ethernet and SPI library because it comes with the Arduino IDE installation.

DHT22 Library

Now paste the below code in the Arduino IDE

#include <SPI.h>
#include <Ethernet.h>
#include "DHT.h"
#define DHTPIN 9
#define DHTTYPE DHT22
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = {192, 168, 1, 18 }; //Read the code explanation below
byte serv[] = {192, 168, 1, 5} ; //Read the code explanation below
EthernetClient cliente;

void setup() {
Serial.begin(9600); //setting the baud rate at 9600
Ethernet.begin(mac, ip);

void loop() {
float hum = dht.readHumidity(); //Reading the humidity and storing in hum
float temp = dht.readTemperature(); //Reading the temperature as Celsius and storing in temp
float fah = dht.readTemperature(true); //reading the temperature in Fahrenheit
float heat_index = dht.computeHeatIndex(fah, hum); //Reading the heat index in Fahrenheit
float heat_indexC = dht.convertFtoC(heat_index); //Converting the heat index in Celsius

 if (cliente.connect(serv, 8095)) { //Connecting at the IP address and port we saved before
cliente.print("GET /ethernet/data.php?"); //Connecting and Sending values to database

//Printing the values on the serial monitor
Serial.print("Temperature= ");
Serial.print("Humidity= ");
Serial.print("Heat Index= ");
cliente.stop(); //Closing the connection
else {
// if you didn't get a connection to the server:
Serial.println("connection failed");

Code Explanation

You need to make changes in the following two lines. Make sure that the Ethernet wire is connected to the Ethernet shield.

byte ip[] = {192, 168, 1, 18 }; 
byte serv[] = {192, 168, 1, 5} ;

In the Arduino IDE, go to files-Examples-Ethernet-DHCPAdressPrinter. A new window will open up, upload the code and in the serial printer, it will show you the IP Address. Enter it in “byte ip[] = {192, 168, 1, 18 };”


Then open the command prompt (cmd) and type in “ipconfig” and it will show you the IPv4 address. Enter it in “byte serv[] = {192, 168, 1, 5} ; ”

The remaining code is explained with the comments.

Step 5

Displaying the Data

To display the data, you will need to create another PHP file that will read the data from the database and will show it on the webpage.

Create another PHP file with the name “display.php” and place it in the same folder where you have placed the other PHP files (C:\xampp\htdocs\ethernet\). Place the following code in the display.php and save the file.

header("Refresh: 5; URL=$url"); // Refresh the webpage every 5 seconds

<title>Arduino Ethernet Database</title>
<style type="text/css">
.table_titles {
padding-right: 20px;
padding-left: 20px;
color: #000;

.table_titles {
color: #FFF;
background-color: #0000FF;

table {
border: 2px solid #333;
body { font-family: "Trebuchet MS", Courier; }

<h1>Arduino Data Logging to Database</h1>
<table border="0" cellspacing="0" cellpadding="4">
<td class="table_titles">ID</td>
<td class="table_titles">Date and Time</td>
<td class="table_titles">Temperature</td>
<td class="table_titles">Humidity</td>
<td class="table_titles">Heat_index</td>

$result = mysqli_query($con,'SELECT * FROM data ORDER BY id DESC');
// Process every record
$oddrow = true;
while($row = mysqli_fetch_array($result))
if ($oddrow)
$css_class=' class="table_cells_odd"';
$css_class=' class="table_cells_even"';
$oddrow = !$oddrow; 
echo "<tr>";
echo "<td '.$css_class.'>" . $row['id'] . "</td>";
echo "<td '.$css_class.'>" . $row['event'] . "</td>";
echo "<td '.$css_class.'>" . $row['temperature'] . "</td>";
echo "<td '.$css_class.'>" . $row['humidity'] . "</td>";
echo "<td '.$css_class.'>" . $row['heat_index'] . "</td>";
echo "</tr>"; 
// Close the connection

Now type the following line in the browser, webpage with data will be shown like shown in below figure



This is it.

I have done another project that is the continuity of this tutorial. I think you guys will love it. Link is as follows
Advanced Garduino with Data Logging to Database

If you have any questions, feel free to ask in the comment section.

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18 Responses

  1. Wilis Permadi

    Hi, great tutorials
    Could you detailed about the connection network between board and PC, is this use router or direct PTP connection ardu to PC

  2. aldwin

    Hello, great tutorials! everything works perfect except for the part where my arduino doesnt register the data to the mysql database. can you please help me?

  3. Hendra

    Hi, nice tutorial. but why in my serial monitor “connection failed”, i follow all of your tutorial

  4. Salman

    I created a table in mysql and i need to send rfid to mark an attendance through ethernet shield…how can i access that table to make an entry pls help

    • Aqib

      If you will follow this tutorial, then you will be able to send the data to the table of the database.

      • Salman

        I want to send RFID id to this function getRfidAttendance() in php that whenever i show card to rfid it sends to that function…pls help about it how to send data to a function

  5. collins

    Thanks a lot the tutorial
    but i have some trouble, my serial monitor prints the send values
    and shows that i have connected to the server but when i check in the database in mysql,
    there are no values sent to the database

    • Aqib

      Try sending the values manually as described in the step 3 to check where the fault is.

  6. Salman

    I am using wamp…so that when i enter that line or remove 8095 from manually entry in database, it shows nothing. What can i use for wamp server ?


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