![]() Your IR remote works by turning an IR LED on and off at a frequency of about 38KHz, encoding data at a speed of up to 120bps. One way to think of this is like an Infra-Red remote control, but on steroids. If you combine this with wired Ethernet or a WiFi network, you have an awesome combination: an Internet connection that uses visible light for the last link. ![]() At the other end, another LED detects these pulses, and can send light pulses back in response, creating a bi-directional link. By switching an LED on and off millions of times a second, you can create a data signal that can be detected by a sensor, but which is invisible to the human eye. The basis of the technology is in turning the LED light on and off very fast. It is simple to implement because it uses an existing technology: LEDs. It is secure because it only works where the light is visible: step out of the room and the signal is lost. It is cheap because it can use a modified LED lightbulb. Speeds of up to 10Gbps have been demonstrated in the lab, and products are now available that offer 10Mbps speed. ![]() Li-Fi sounds like the an engineer’s fevered dream: it is fast, cheap, secure and simple to implement. This type of Visible Light Communication (VLC) uses something that is present in pretty much every room: an LED lightbulb. Short for Light Fidelity, LiFi uses visible light to send data, creating the link between router and device with invisible pulses of light. A new way to transmit data is coming that could radically change the way that devices talk to each other: LiFi. ![]()
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