Her code allows you to configure the type and number of RFID cards required to trigger one of the Arduino’s digital pins, which usually would be connected to a relay to fire off whatever device ...

There are simple controls and all the circuitry to support its lithium battery as well. All of the source code that [Turi] used to build this is available on the project’s GitHub page.

Nair explained that many schools use an RFID-based attendance system known as an iClicker to track whether or not a student is present. The system includes a base station for each classroom or lecture ...

You must know about RFID cards. It uses radio frequency identification technology to instantly identify/track the tags associated with any objects/living being.