In this section, we'll see how to send data to the server and integrate the elements that we have seen during previous chapters. In the following image, we can see the finished integration of the system:

This is the Sketch for the Arduino board:

    // Example web client using the Ethernet shield

    // Include libraries
    #include <SPI.h>
    #include <Ethernet.h>

    // Enter a MAC address for your controller below.
    byte mac[] = { 0x90, 0xA2, 0xDA, 0x0E, 0xFE, 0x40 }; 

    //IpAddress if DHCP fails
    IPAddress ip(192,168,1,50);

    // IP address of the Raspberry
    IPAddress server(192,168,1,108); 

    // Initialize the Ethernet client
    EthernetClient client; 

    void setup() {
     // Open serial communications
     Serial.begin(9600); 

    // Start the Ethernet connection
     //if (Ethernet.begin(mac) == 0) {
     // Serial.println("La Dirección IP se asigna por DHCP");
     Ethernet.begin(mac, ip);
 
     // Display IP
     Serial.print("IP address: ");
     Serial.println(Ethernet.localIP());
 
     // Give the Ethernet shield a second to initialize
     delay(1000);
     Serial.println("Conectando...");
    }
    void loop()
    {
     //variables to deploy
     Serial.println("Humidity: " + hum);
 
     if (client.connect(server, 80)) {
     if (client.connected()) {
     Serial.println("connected");
 
     // Make a HTTP request:
     client.println("GET /parking.php?valor1=" + valor1 + "&valor2=" + valor2 + " HTTP/1.1");
     client.println("Host: 192.168.1.108");
     client.println("Connection: close");
     client.println();
     } 
     else {
     // If you didn't get a connection to the server
     Serial.println("failed the connection");
     }
 
     // Read the answer
     while (client.connected()) {
     while (client.available()) {
     char c = client.read();
     Serial.print(c);
     }
     }

    // If the server's disconnected, stop the client:
     if (!client.connected()) {
     Serial.println();
     Serial.println("desconectado.");
     client.stop();
     }
     }
     // Repeat every second
     delay(5000);
    }