He noted that the Arduino is a low-power technology that could be powered with a small battery. By placing the custom Arduino-based Time Turner in a classroom, it could potentially mimic the actions ...

A tape can be selected and placed in the player, and the Arduino at the center of it will recognize the tag and play the corresponding MP3 file stored locally on an SD card.

After you've assembled the rather complex contraption, you affix color-coded RFID tags to your gadgets, before registering them with the Arduino-based host.