
Working with “wireless” LEDs feels a bit like
magic. These tiny LED assemblies can emit light
without directly connecting to a power supply.
The secret to their energy source is a nearby wire
coil in which a high-frequency oscillating current
generates a fluctuating magnetic field. Each
induction-powered LED is attached to its own
tiny wire coil, which responds to this changing
magnetic field by producing a small (about 2mA)
current.
A LITTLE LIGHT SELF-REFLECTION
I often obsess over finding novel ways to use
LEDs in projects, such as my weather displaying
edge-lit rainbow (build it at makezine.com/
projects/edge-lit-rainbow-weather-display)