#include #include #include #include #include #define RST_PIN 9 #define SS_PIN 10 #define CLK_PIN 7 #define DAT_PIN 6 #define RST_DS_PIN 5 MFRC522 rfid(SS_PIN, RST_PIN); DS1302 rtc(RST_DS_PIN, DAT_PIN, CLK_PIN); LiquidCrystal_I2C lcd(0x27, 16, 2); struct Card { String uid; String name; }; Card knownCards[] = { {"DE AD BE EF", "Aryan"}, }; int cardCount = 1; void setup() { Serial.begin(9600); SPI.begin(); rfid.PCD_Init(); lcd.init(); lcd.backlight(); lcd.setCursor(0, 0); lcd.print("Attendance Sys"); lcd.setCursor(0, 1); lcd.print("Scan your card"); rtc.setDOW(WEDNESDAY); rtc.setTime(18, 53, 0); rtc.setDate(1, 7, 2026); Serial.println("Name,UID,Date,Time"); } String getUID() { String uid = ""; for (byte i = 0; i < rfid.uid.size; i++) { if (rfid.uid.uidByte[i] < 0x10) uid += "0"; uid += String(rfid.uid.uidByte[i], HEX); if (i < rfid.uid.size - 1) uid += " "; } uid.toUpperCase(); return uid; } String lookupName(String uid) { for (int i = 0; i < cardCount; i++) { if (knownCards[i].uid == uid) return knownCards[i].name; } return "Unknown"; } void loop() { if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return; String uid = getUID(); String name = lookupName(uid); Time t = rtc.getTime(); String date = String(t.date) + "/" + String(t.mon) + "/" + String(t.yr); String timeStr = String(t.hour) + ":" + (t.min < 10 ? "0" : "") + String(t.min) + ":" + (t.sec < 10 ? "0" : "") + String(t.sec); Serial.println(name + "," + uid + "," + date + "," + timeStr); lcd.clear(); lcd.setCursor(0, 0); lcd.print(name.substring(0, 16)); lcd.setCursor(0, 1); lcd.print(timeStr + " " + date); delay(2000); lcd.clear(); lcd.setCursor(0, 0); lcd.print("Attendance Sys"); lcd.setCursor(0, 1); lcd.print("Scan your card"); rfid.PICC_HaltA(); rfid.PCD_StopCrypto1(); }