Why use old fashioned keys when you can use newfangled electronic keys? If you are looking to build a simple RFID-based security system to secure your important stuff, this project from Resin.io ...

Nair explained that many schools use an RFID-based attendance system known as an iClicker to track whether ... Nair said that a clone device could be built using a low-cost Arduino electronics ...

You could buy a higher quality item intended for normal use ... likeness with an RFID tag hidden in each one. A tape can be selected and placed in the player, and the Arduino at the center ...