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Demo: Illuminating the Data - A New Bridge between Things and Humans

In the IoT era, low-cost, small-size, and intuitive data access to things is required. As such a method, LED-to-camera communication for smartphones is promising. However; there are intermittent time gaps between camera frames, which makes it unsuitable for large data transfer and thus narrows its usage to simple applications such as exchanging a few tens of bits of ID. Towards this, we propose a packet retransmission strategy which leverages the periodicity of burst packet losses. It can minimize the number of the retransmission times and prevent data losses caused by time gaps for a wide range of smartphone models. Our developed prototypes using ATtiny85 and 5 mm-LED can achieve more than 10x throughput of previous works without data losses.