Im trying to do an automatic door lock with arduino uno and Rfid and I want to change the access to another card. For example, it says that my card is denied. I want to have a certain card that grants access but when I copie the number id of the card i want in the access granted string, i doesn't work. It is always going to show me denied access even if I put that we needed the number id of the card i want in the granted access part. It always denies and show the red led(which is set for denied access), my circuit is well connected its really a coding problem. Please help me, HERE'S MY CODE AND PICTURE OF THE CODE.
#include <SPI.h>
#include <MFRC522.h>
#include <Servo.h>
// Pin definitions for the MFRC522
#define SS_PIN 10 // SDA pin for RFID reader
#define RST_PIN 9 // RST pin for RFID reader
MFRC522 rfid(SS_PIN, RST_PIN); // Create MFRC522 instance
// Define the RFID tag to be accepted
String accessGranted[2] = {"8F5C7F6"}; // RFID serial numbers to grant access
int accessGrantedSize = 2; // The number of serial numbers
Servo lockServo; // Servo for the locking mechanism
int lockPos = 15; // Position for locked
int unlockPos = 75; // Position for unlocked
boolean locked = true;
int redLEDPin = 5; // Pin for the red LED
int greenLEDPin = 6; // Pin for the green LED
void setup() {
Serial.begin(9600); // Initialize serial communication
SPI.begin(); // Start SPI communication
rfid.PCD_Init(); // Initialize the RFID reader
pinMode(redLEDPin, OUTPUT); // Initialize red LED
pinMode(greenLEDPin, OUTPUT); // Initialize green LED
lockServo.attach(3); // Attach the servo to pin 3
lockServo.write(lockPos); // Set servo to locked position
Serial.println("Place card/tag near reader...");
}
void loop() {
// Look for new RFID cards
if (rfid.PICC_IsNewCardPresent()) {
Serial.println("Card found");
String temp = ""; // Temporary variable to store the card ID
// Read the RFID card's ID
if (rfid.PICC_ReadCardSerial()) {
for (byte i = 0; i < rfid.uid.size; i++) {
temp += String(rfid.uid.uidByte[i], HEX); // Convert card UID to hex string
}
temp.toUpperCase(); // Convert the ID to uppercase
Serial.print("The card's ID number is: ");
Serial.println(temp);
checkAccess(temp); // Check if the card is authorized
}
rfid.PICC_HaltA(); // Halt the RFID communication
}
rfid.PCD_StopCrypto1(); // Stop the encryption
}
void checkAccess(String temp) {
boolean granted = false;
Serial.print("Checking UID: ");
Serial.println(temp); // Debugging: Print the UID being checked
// Check if the card ID matches the authorized cards
for (int i = 0; i < accessGrantedSize; i++) {
Serial.print("Comparing with stored UID: ");
Serial.println(accessGranted[i]); // Debugging: Print the stored UID
if (accessGranted[i] == temp) { // If the UID matches
Serial.println("Access Granted");
granted = true;
// Unlock the servo if it's locked
if (locked) {
lockServo.write(unlockPos);
locked = false;
} else {
// Lock the servo if it's unlocked
lockServo.write(lockPos);
locked = true;
}
// Blink the green LED to show access is granted
digitalWrite(greenLEDPin, HIGH);
delay(200);
digitalWrite(greenLEDPin, LOW);
delay(200);
digitalWrite(greenLEDPin, HIGH);
delay(200);
digitalWrite(greenLEDPin, LOW);
delay(200);
break; // Exit the loop once access is granted
}
}
if (granted) {
// Access granted, perform the desired action
// (e.g., unlocking a door, etc.)
} else {
// Access denied, show message and blink red LED
Serial.println("Access Denied");
digitalWrite(redLEDPin, HIGH); // Blink red LED
delay(200);
digitalWrite(redLEDPin, LOW);
delay(200);
digitalWrite(redLEDPin, HIGH);
delay(200);
digitalWrite(redLEDPin, LOW);
delay(200);
} // End of 'else' block
} // End of checkAccess function
