My problem now is that the uID is not sent to the web server on the PC but it is serially printed and the client is certified to be connected. [outputs “connected” and IP is printed] but it does not reflect on my DB. I’m using XAMPP, Firewall off, IP both correct. Port is 80 and manual encoding of the argument is working, like localhost/add_data_php?rfid=12345678 [12345678 does reflect on the DB] 
Maybe because it needs delay? or on or off of the SS pins of each? your help will be much appreciated. :))
The “counter” and the “first” variables are used for the condition that whenever a card gets detected, that’s the only way that data will be sent to server. All seems to work fine serially, as it gets pass through all the code whenever a card gets detected. but it does not reflect on the DB. I always manage to save in the DB with a “dummy” number and and in one execution only, that is setup and not on the loop. Please hellppp thanks.
#include <SPI.h>
#include <MFRC522.h>
#include <Ethernet.h>
#define SS_PIN 9
#define RST_PIN 8
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server(192,168,0,104); // numeric IP for server (no DNS) (reduce sketch size)
IPAddress ip(192,168,0,103); //numeric IP of the ETHERNET shield (STATIC)
EthernetClient client; //Initialize the Ethernet client library(port 80 is HTTP default):
int first=0;
int counter=0;
String uID;
void setup() {
Serial.begin(9600); // Initialize serial communications with the PC
// disable SD SPI
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
// disable w5100 SPI
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
//Serial.println("Scan a MIFARE Classic PICC to demonstrate Value Blocks.");
Ethernet.begin(mac, ip); //we used a STATIC address to start ETHERNET
// print your local IP address:
Serial.print("My IP address: ");
for (byte thisByte = 0; thisByte < 4; thisByte++) {
// print the value of each byte of the IP address:
Serial.print(Ethernet.localIP()[thisByte], DEC);
Serial.print(".");
}
// give the Ethernet shield a second to initialize:
delay(1000);
Serial.println("connecting...");
}
void loop() {
// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
MFRC522::MIFARE_Key key;
for (byte i = 0; i < 6; i++) {
key.keyByte[i] = 0xFF;
}
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
// Now a card is selected. The UID and SAK is in mfrc522.uid.
// Dump UID
//Serial.print("Card UID:");
int val1=(mfrc522.uid.uidByte[0]);
int val2=(mfrc522.uid.uidByte[1]);
int val3=(mfrc522.uid.uidByte[2]);
int val4=(mfrc522.uid.uidByte[3]);
String valA=String(val1);
String valB=String(val2);
String valC=String(val3);
String valD=String(val4);
uID=valA+valB+valC+valD;
Serial.print(uID);
Serial.println();
counter=counter+1;
Serial.print(counter);
//}
Serial.println();
// Halt PICC
mfrc522.PICC_HaltA();
// Stop encryption on PCD
mfrc522.PCD_StopCrypto1();
if (counter>first)
{//delay ifs
// enable w5100 SPI
if (client.connect(server, 80)) { //start of IF
Serial.println("connected");
// Make a HTTP request:
client.print("GET /add_data.php?rfid="); //dont make these println
client.print(uID); //dont make these println
client.println(" HTTP/1.1");
client.print("Host: ");
client.println(server);
client.println("Connection: close");
client.println();
Serial.print("SENT");
Serial.println();
first++;
Serial.print(first);
Serial.println();
client.stop();
} //end OF IF
}//delay ifs
}
