Smart LED light link IoT can locate indoor device

Researchers at Disney Research and ETH Zurich connect smart LED lights and the Internet of Things to create a visible light system that can track the location of the device indoors. Researchers at Disney Research and the ETH Zurich have added location-seeking capabilities to LED lights for lighting, making them available not only for indoor lighting, but also for communication links indoors. Researchers have developed the EnLighting system based on consumer LEDs and adjusted their illuminating and photosensor functions. By having each individual LED alternately transmit the conditioned optical signal and act as a signal receiver, a network of light bulbs can be created that can communicate with each other and to the device without affecting the interior illumination. Stefan Schmid, Ph.D. student at ETH Zurich, and other researchers recently shared their findings and details at the IEEE International Conference on Sensing, Communication and Networking (SECON) in London. While the visible light communication network retains the radio spectrum, it also makes it difficult for anyone outside the network's visible range (LoS) to eavesdrop, said Markus Gross, vice president of Disney Research. VLC system concept based on LED smart bulbs: LED lights in the visible range can communicate with each other Researchers have retrofitted this LED bulb with Qualcomm's Wi-Fi chip Atheros 3991 and implemented the Linux embedded version. Pulse width modulation (PWM) with simple ON-OFF Keying (OOK) modulation is used to generate physical layer (PHY) symbols and LED modulation via the Atmel ATmega328p microcontroller. Improved LED Bulbs Researchers deployed four such bulbs for their proven systems. They found that their system architecture and protocols enable the bulb to create a stable network that can accommodate low-bandwidth applications (usually IoT devices). The researchers also showed that the system can be used to estimate the location of the device indoors. In addition to the ability to communicate with each other, the key to its features is not only to support a wide range of IP protocols, but also for a range of applications. Since the adjacent bulbs can be synchronized, the number of data collisions is reduced, making the connection more stable. Adding two wafers to the Wi-Fi return channel The system can also dynamically assign bulb beacon values, turn off or replace one of the bulbs, or reassign the location. In addition, the new system is expected to require a lower computational load when locating the bulb than a system using Bluetooth beacons, hybrid radio frequency (RF) or optics.

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