One uses the LiquidCrystal_I2C library (I²C display). The other uses the LiquidCrystal library (parallel display). In the code, set: USE_I2C = 1 for I²C displays (with LiquidCrystal_I2C) USE_I2C = 0 ...

Interface the keypad with Arduino using digital pins, which will capture user input. Step3: Use an RFID library (such as the MFRC522 library) to read and process RFID tags. Store the authorized RFID ...

The use of Radio Frequency IDentification (RFID) technologies is growing. Many different applications are implemented in various sectors, and used for very different purposes. RFID enables wireless ...