Brightest day, darkest night, charge it with Arduino’s light

To userp the Green Lantern oath is a sacrilege. But calm your rage as you take in this Green Lantern battery and ring project. [Jon] built the power battery portion out of LEGO, but inside you’ll find an added bonus. An Arduino uses a set of LEDs and an RFID reader to bring the object alive. A matching ring contains the RFID tag that activates the lights when held up to the lantern’s lens. You can see this used to charge the power ring (and join in by saying the oath) in the video after the break.

Want to build something like this but don’t have an RFID reader? This would be easy to pull off by adding a magnet to the ring and a hall effect sensor in the lantern. Maybe this will make you rethink your Halloween costume this year.

[Thanks Hugo]


  1. grenadier says:

    Ring needs more tritium glow lamp.

  2. strider_mt2k says:

    Yeah, until it backs up into the mains…

  3. Sodor says:

    Cool!, now add a electric door lock and you have a nice method to open your room.

  4. aztraph says:

    whenever he uses it, somewhere, a geek keeps his virginity

  5. Gilliam says:

    i might have used a magnet in the ring and a reed switch in the lamp face attached to a brightening/dimming circuit.

  6. belsonc says:

    Usurp, not userp. :-)


  7. Itwork4me says:

    Lego and DC and Halloween! Great lil project while heeding the above comments. Beware of geeks who will keep you talking about it and your dormant lego batman utility belt project more than being able to hit on chicks.

  8. Eirinn says:

    @Gilliam yeah a reed switch would have been a much cheaper way to do this.

  9. sonny says:

    The RFID is used so that no other ring can be charged at the lantern but that specific ring, true to the form of all the GL Forces in the universe. Each ring is paired to only 1 lantern, and can only be charged at one lantern. least that’s how it used to be, in the golden age.

    Fun also serves a useful purpose.

  10. Jon says:

    Thanks. Glad you guys like it.

    The hall effect sensor or the reed switch would work, but if I do other lanterns (yellow, blue, etc.) then I don’t want the colors to be able to trigger the other colors. By using RFID, I can program it to only work with the specific rings.

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