RFIDesk - an interactive surface for multi-touch and rich-ID stackable tangible interactions.

This work introduces RFIDesk, an interactive surface that enables both multi-touch and rich-ID stackable tangible interactions. By using ultra-high frequency (UHF) radio-frequency identification (RFID) technology, the RFIDesk can effectively identify the elements of a stack. Furthermore, this system integrates capacitive multi-touch sensing based on indium tin oxide (ITO) to effectively detect touch events while preserving the interface transparency, thus enabling rich visual feedback to be displayed under the stackable objects. The interference between the two sensing technologies is resolved by applying time-division multiplexing sampling. We use a tangible tower-defense game to demonstrate the interaction possibilities of this system.