Create sketch_1.ino

src/sketch_1.ino

@@ -0,0 +1,97 @@
+#include <SPI.h>
+#include <MFRC522.h>
+#include <LiquidCrystal_I2C.h>
+
+// Pin Definitions
+#define SS_PIN 5
+#define RST_PIN 9
+#define RELAY 3 // Connect the relay to pin 3
+#define BUZZER 2 // Connect the buzzer to pin 2
+#define ACCESS_DELAY 2000
+#define DENIED_DELAY 1000
+
+// Create MFRC522 and LCD instances
+MFRC522 mfrc522(SS_PIN, RST_PIN);
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+
+void setup()
+{
+  // Initialize LCD and Serial communication
+  lcd.init();
+  lcd.backlight();
+  Serial.begin(9600);
+
+  // Initiate SPI bus and MFRC522
+  SPI.begin();
+  mfrc522.PCD_Init();
+
+  // Set pin modes
+  pinMode(RELAY, OUTPUT);
+  pinMode(BUZZER, OUTPUT);
+  noTone(BUZZER);
+  digitalWrite(RELAY, HIGH);
+
+  // Display welcome message on LCD and Serial monitor
+  lcd.setCursor(4, 0);
+  lcd.print("WELCOME!");
+  lcd.setCursor(0, 1);
+  lcd.print("Scan your card");
+  Serial.println("Put your card to the reader for scanning ...");
+  Serial.println();
+}
+
+void loop()
+{
+  // Check if a new card is present
+  if (!mfrc522.PICC_IsNewCardPresent())
+  {
+    return;
+  }
+
+  // Read the card's UID
+  if (!mfrc522.PICC_ReadCardSerial())
+  {
+    return;
+  }
+
+  // Display the UID on the 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();
+
+  // Check if the card is authorized
+  if (content.substring(1) == "33 9F 94 F5") // Replace with your own card number
+  {
+    // Grant authorized access
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("Authorized access");
+    Serial.println("Authorized access");
+    Serial.println();
+    delay(500);
+    digitalWrite(RELAY, LOW);
+    delay(ACCESS_DELAY);
+    digitalWrite(RELAY, HIGH);
+  }
+  else
+  {
+    // Deny access and activate buzzer
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("Access denied");
+    Serial.println("Access denied");
+    tone(BUZZER, 300);
+    delay(DENIED_DELAY);
+    noTone(BUZZER);
+  }
+}