---
title: "Arduino + Ethernet Shield + RFID RC522"
url: "https://maker.wiznet.io/jaden/projects/arduino-ethernet-shield-rfid-rc522/"
markdown_url: "https://maker.wiznet.io/jaden/projects/arduino-ethernet-shield-rfid-rc522/md"
type: "UCC: User Created Content"
author: "Jack"
author_url: "https://homeguard24.pl/arduino-ethernet-shield-rfid/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Jack"
original_url: "https://homeguard24.pl/arduino-ethernet-shield-rfid/"
published: "2022-11-01"
language: "en"
hardware: ["Arduino UNO", "Arduino Ethernet Shield", "??? RC522 RFID"]
likes: 4
views: 1256
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Arduino + Ethernet Shield + RFID RC522

> log of card use

Original author: Jack (source: https://homeguard24.pl/arduino-ethernet-shield-rfid/)

## Components

- **Arduino UNO** x 1 ([docs](https://www.farnell.com/datasheets/1682209.pdf))
- **Arduino Ethernet Shield** x 1 ([docs](https://docs.arduino.cc/retired/shields/arduino-ethernet-shield-without-poe-module))
- **??? RC522 RFID** x 1

## Article

This project show how to build a log of using RFID cards with Arduino Uno, Ethernet Shield and RC522 RFID reader.

author used web technologies such as PHP and mySQL.

![](https://maker.wiznet.io/upload/ckeditor5/151033983%5F1667405721%2Epng)

This is system block diagram.

![](https://maker.wiznet.io/upload/ckeditor5/1010957345%5F1667331384%2Epng)

when RFID reader read a tag, UNO check unique UID and compare with uniqur UID in code. If it's same runs a PHP script via http request that updates the database with the date and time of card use and its ID. If the authorization was successful, the green LED lights up. Otherwise, the red LED lights up.

If the numbers are the same, Arduino runs a PHP script via http request that updates the database with the date and time of card use and its ID.

If the authorization was successful, the green LED lights up. Otherwise, the red LED lights up.

this is the code

| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | #include <SPI.h> #include <MFRC522.h> #include <Ethernet.h> byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x01 }; EthernetClient client; #define SS_PIN 7 #define RST_PIN 6 MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance. byte readCard[4]; String rfidUid = ""; String kartaauth1="9bd37725"; // deklaracja autoryzowanej karty void setup() { // disable RFID SPI pinMode(7, OUTPUT); digitalWrite(4, HIGH); // disable w5100 SPI pinMode(10, OUTPUT); digitalWrite(10, HIGH); Serial.begin(9600); if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); } SPI.begin(); // Init SPI bus mfrc522.PCD_Init(); // Init MFRC522 card Serial.println("Scan PICC to see UID and type..."); pinMode(3, OUTPUT); pinMode(4, OUTPUT); } void loop() { // Look for new cards if ( ! mfrc522.PICC_IsNewCardPresent()) { return; } // Select one of the cards if ( ! mfrc522.PICC_ReadCardSerial()) { return; } for (byte i = 0; i < mfrc522.uid.size; i++) { rfidUid += String(mfrc522.uid.uidByte[i] < 0x10 ? "0" : ""); rfidUid += String(mfrc522.uid.uidByte[i], HEX); mfrc522.PICC_HaltA(); } Serial.println(rfidUid); if(rfidUid == kartaauth1) { digitalWrite(3,HIGH); digitalWrite(4,LOW); if (client.connect("xxx.xxx.xxxl",80)) { // REPLACE WITH YOUR SERVER ADDRESS client.print("GET /rfid.php?"); client.print("getrfid="); client.print(rfidUid); client.println( " HTTP/1.1"); client.println( "Host: xxx.xxx" ); client.println("Content-Type: application/x-www-form-urlencoded"); client.println( "Connection: close" ); client.println(); client.println(); } if (client.connected()) { client.stop(); // DISCONNECT FROM THE SERVER } } else { digitalWrite(3,LOW); digitalWrite(4,HIGH); } delay(3000); digitalWrite(3,LOW); digitalWrite(4,LOW); rfidUid = ""; } |
| --- | --- |

I think this project is very useful for other projects such as access control using RFID cards, home automation using RFID.

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Source: https://maker.wiznet.io/jaden/projects/arduino-ethernet-shield-rfid-rc522/