Arduino RFID

www.huvitera.ee/arduino-rfid

				
					// NR1.1 - LCD ja I2C

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x3F, 16, 2);
 
// Change 0x27 to 0x3F and retry if LCD screen does not show anything
 
void setup() {
  lcd.init();  
  lcd.backlight();
 
  // Print a message to the LCD.
  lcd.setCursor(1, 0);          // Go to position column 2 & row 1
  lcd.print("Hello, world!");   // Print "Hello, World!"
  lcd.setCursor(0, 1);          // Go to position column 1 & row 2
  lcd.print("Mis toimub?");     // Print "I am _Name_"

}
 
void loop() {


}

				
					// NR2 - DumpInfo - leia oma kaardi kood

Libraries - MFRC522
File-Examples-MFRC522-Dumpinfo

Convert HEX to DECIMAL
https://www.atatus.com/tools/hex-to-decimal

				
					// NR3 - LCD ja RFID

#include <SPI.h> 
#include <MFRC522.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define SS_PIN 10 
#define RST_PIN 9 

#define LED_DENIED_PIN 7
#define LED_ACCESS_PIN 6

LiquidCrystal_I2C lcd(0x3F,16,2);
MFRC522 mfrc522(SS_PIN, RST_PIN); // Instance of the class

int code[] = {32,154,149,117}; //This is the stored UID (Unlock Card)
int codeRead = 0;
String uidString;

void setup() {

   Serial.begin(9600); 
   SPI.begin();       // Init SPI bus
   mfrc522.PCD_Init(); // Init MFRC522 
   Serial.println("Arduino RFID reading UID");
   pinMode( LED_DENIED_PIN , OUTPUT); 
   pinMode( LED_ACCESS_PIN , OUTPUT);
   lcd.init();

  // Print a message to the LCD.

  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Show your card:)");

}

void loop() {
if ( mfrc522.PICC_IsNewCardPresent())
    {
        if ( mfrc522.PICC_ReadCardSerial())
        {
           lcd.clear();
           Serial.print("Tag UID:");
           lcd.setCursor(0,0);
           lcd.print("Tag UID:");
           lcd.setCursor(0,1);
           for (byte i = 0; i < mfrc522.uid.size; i++) {  
                  Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "); 
                  Serial.print(mfrc522.uid.uidByte[i], HEX);
                  lcd.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
                  lcd.print(mfrc522.uid.uidByte[i], HEX);
                //  lcd.print(" ");

            }
            Serial.println();
            int i = 0;
            boolean match = true;

            while(i<mfrc522.uid.size)

            {
               if(!(int(mfrc522.uid.uidByte[i]) == int(code[i])))
               {
                  match = false;
               }
              i++;
            }
          delay(3000);
           lcd.clear();
           lcd.setCursor(0,0);
           if(match)
           {
              digitalWrite( LED_ACCESS_PIN , HIGH);
              lcd.print("Authorized access");
           }else{
              digitalWrite( LED_DENIED_PIN , HIGH);
              lcd.print(" Access denied  "); 
             Serial.println("\nUnknown Card");
           }
             Serial.println("============================");
             mfrc522.PICC_HaltA();
             delay(3000); 
             reset_state();
        }
}
}
void reset_state()
{
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Show your card:)");
    digitalWrite( LED_ACCESS_PIN , LOW);
    digitalWrite( LED_DENIED_PIN , LOW);
}

Arduino RFID

www.huvitera.ee/arduino-rfid

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