For more advanced security applications, you might also want to explore our RFID door lock system using Arduino ... interface and CR2032 battery backup. It also has an AT24C32 EEPROM IC (32KB external ...

Arduino RFID/NFC Cloner & Emulator A turnkey Arduino project to read, clone and (optionally) emulate MIFARE Classic 1K tags or NTAG2xx NFC cards using a PN532 module. Perfect for security research, ...

wide‐range instrument using Arduino’s Timer1 Input Capture. You’ll get instant period readings, automatic smoothing, dynamic range up to several MHz, and a clean I²C LCD interface.