What would you do with a wireless LED? Maybe lighting in a model display or a checkerboard? We wondered if you could use two or more power frequencies to signal (for example, 200 kHz lights a red ...

The LED is connected to a simple analog modulator circuit, which takes an audio signal as its input and sends the data to the light. The solar cell sends its data, with the help of a capacitor ...

And while candles are usually a top choice, a portable and wireless alternative could be just the ticket the next time the lights go out. These motion-sensor magnetic wall lights are rechargeable ...