Voltaat Arduino Ultimate Kit

80 min

The RFID reader is a module that reads a unique number from a tag or a card when it comes near it. You can then use the scanned number to identify the card holder.

Project Video

Overview

In this tutorial, we will use the RFID reader to read the data from the tag and then print a message on your computer. We can use this project to open a gate so that only the person with the correct information on his tag can enter.

Getting the Items

Arduino Uno R3 (Voltaat Version)

Get Item

RFID Kit

Get Item

Jumper Wires - Male to Male (40 Pack)

Get Item

Steps

Wiring it Up

It is important to note that the RFID reader module operates on 3.3V, not 5V, so we connected it with the 3.3V pin.

To set up the RFID reader in the correct way, follow the instructions below. The image demonstrates how to connect the wires between the RFID reader and the Arduino. Once the RFID reader and the Arduino are connected to each other, connect the Arduino to your computer using the USB cable.

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Connections from the RFID reader to the Arduino:

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• RFID 3.3V pin → Arduino VCC (3.3V) pin

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• RFID RST pin → Arduino pin 9

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• RFID GND pin → Arduino GND pin

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• RFID IRQ pin → unconnected

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• RFID MISO pin → Arduino pin 12

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• RFID MOSI pin → Arduino pin 11

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• RFID SCK pin → Arduino pin 13

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• RFID SDA pin → Arduino pin 10

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Coding

Download Copy Code

/*
Voltaat learn (http://learn.voltaat.com)
Link for full tutorial:
RFID reader library:

SPI library:It is included in the Arduino IDE by defulalt

Tutorial: RFID reader for safe pass gate

It is important to note that the RFID reader module operates on 3.3V not 5V,
so we connected it with the 3.3V pin.

Connections from the RFID reader to the Arduino:
• RFID 3.3V pin → Arduino VCC (3.3V) pin
• RFID RST pin → Arduino pin 9
• RFID GND pin → Arduino GND pin
• RFID IRQ pin → unconnected
• RFID MISO pin → Arduino pin 12
• RFID MOSI pin → Arduino pin 11
• RFID SCK pin → Arduino pin 13
• RFID SDA pin → Arduino pin 10

*/

//This library allows you to communicate with SPI devices
#include "SPI.h"
//This library allows you to use RFID reader
#include "MFRC522.h"

//Define RFID reader pins
#define SS_PIN 10
#define RST_PIN 9

//Create MFRC522 instance
MFRC522 mfrc522(SS_PIN, RST_PIN);

//Commands inside void setup run once
void setup()
{
//Start the serial monitor at 9600 baud rate (9600 bits per second)
Serial.begin(9600);
//Initialize spi connection
SPI.begin();
//Initiate MFRC522
mfrc522.PCD_Init();
//Print to serial monitor
Serial.println("Approximate your card to the reader...");
Serial.println();

}

//Commands inside void loop run forever
void loop()
{
//Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
{
return;
}

//Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
{
return;
}

//Print to serial monitor
Serial.print("UID tag :");
String content = "";
byte letter;
for (byte i = 0; i < mfrc522.uid.size; i++)
{
Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
Serial.print(mfrc522.uid.uidByte[i], HEX);
content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
content.concat(String(mfrc522.uid.uidByte[i], HEX));
}
Serial.println();
Serial.print("Message : ");
content.toUpperCase();
//Make sure you change this with your own UID number
if (content.substring(1) == "8A 21 EC 81")
{
//Print to serial monitor
Serial.println("Authorised access, The gate will open");
Serial.println();
//Delay for 3 sec
delay(3000);
}

else {
//Print to serial monitor
Serial.println("Access denied, Please try again");
//Delay for 3 sec
delay(3000);
}
}