5V wireless LED lights up thanks to magnetic resonance coupling technology

Wireless power, no matter how inefficient it may be, sounds good and even looks good with the “5V remote wireless power supply LED pack” we feature in this post. It also feels magical with the LEDs lighting up thanks to magnetic resonance coupling technology.

The solution comes with a coil as a transmitter and each LED bead also includes a small coil as a receiver. When the two are coupled, energy can be transferred from the transmitter to the receiver through the air, paper, or plastic casing, and the LEDs will light up.

The magnetic field intensity in this technology is said to be similar to that of the Earth’s magnetic field, and it will not be harmful to human health and other devices.


  • Transmitter Module Input Voltage – 5 V
  • Power – 0.5W (10 LEDs)
  • Transmitting Coil Outer Diameter – 70mm, inner diameter 65mm, thickness 0.5mm
  • Transmitter Board Size – length 16mm, width 12mm, thickness 2.5mm
  • Outer Diameter of LED Receiver: – 4.3mm
  • Sensing Distance –  0 to 80 mm
  • LEDs – 10x (2x red, 2x white, 2x green, 2x blue, 2x yellow)
  • Working Principle – magnetic resonance coupling technology

Adafruit had a similar kit that was reviewed by “Adam Savage’s Tested”, so you see how the system actually works.

DFRobot is selling the kit for $9.90 with 10 wireless LED’s and the transmitting coil.

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5 Replies to “5V wireless LED lights up thanks to magnetic resonance coupling technology”

  1. Amusing. I’ve done that in the past, using hand-made coils, and various inductors coupled with a capacitor delivering into a LED. It’s easy and works well but it’s bulky. It’s impressive that they managed to collect that much power from so tiny a coil in the LED blocks, because the coupling varies in (d1/d2)^2 for the sending and transmitting coils diameters.

    1. It’s most likely impedence matched with the transmitter’s frequency. Also the LED’s can be incredibly cheap since the coils are just fairly standard inductors, which also brings the benefit of it not being an air-core coil. Very nice overview in Big Clives video too https://www.youtube.com/watch?v=UQ3K0suY1Dc

  2. I picked up a set of these a few months back after HackADay had an article on them. They’re cute and interesting, but I haven’t really found a use for them. Maybe they would be useful for something that has to move within a restricted range and emit a small amount of light.

  3. “it will not be harmful to human health and other devices”

    Can you guarantee that the generated magnetic field will not interfere with cardiac pacemakers?

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