Ambient Light Backscatter Communication for IoT Applications

Yun, Jisu; Jang, Byung-Jun

doi:2016.16.4.214

J. Electromagn. Eng. Sci > Volume 16(4); 2016 > Article

Journal of Electromagnetic Engineering and Science 2016;16(4):214-218.
DOI: https://doi.org/10.5515/JKIEES.2016.16.4.214

Ambient Light Backscatter Communication for IoT Applications

Jisu Yun, Byung-Jun Jang

Department of Electrical Engineering, Kookmin University

Correspondence: Byung-Jun Jang,Email: bjjang@kookmin.ac.kr

Abstract

In this paper, we present an ambient light backscatter communication design that enables Internet of Things (IoT) devices to communicate through the backscattering ambient light emitted from lighting infrastructure or sunlight. The device can selectively modulate ambient light by switching a liquid crystal display (LCD) shutter located on its surface, so that a nearby smart device, which includes a photodiode or a camera, can demodulate this backscattered light information. To verify the practicality of the proposed concept, we design an IoT device equipped with a commercial LCD shutter and a microcontroller. Our device produces ambient light backscattered data at a speed of 100 bps, and these data are successfully decoded by a commercial photodiode module 10 cm away from the IoT device. We believe that our ambient light backscatter communication design is appropriate for implementation in various IoT applications.

Key words: Ambient-Light, Backscatter, Backscattered Light, IoT, LCD Shutter, Reverse Link, Visible Light