Indoor Fireworks

About: Exploring the cosmos one synapse fire and one mouse click at a time.

This is just a simple two color LED light wand that is fun to play with in the dark, and makes some cool light art.

What you need to make it:

  • 1 - Toilet paper tube
  • Scrap Piece of Cardboard
  • 3 - AA Batteries
  • 4 - Water clear Red LED's
  • 4 - UV LED's
  • 10' Speaker Wire
  • 1 - SPDT Micro Switch


  • Soldering Iron and Solder
  • Hot Glue Gun and Sticks
  • Scissors
  • Utility Knife

Step 1: Make the Light Tendrils

  1. Cut 8 12" lengths of speaker wire and strip and tin the ends with solder.
  2. Solder a series resistor appropriate for your LED's, when powered by 4.5 Volts, to the positive leg of each LED.
  3. Solder the positive and negative wires to the LED's as shown.

Step 2: Put the Rest Together

  1. Twist all of the negative wires together at the other end.
  2. Twist all of the positive wires together at the other end.
  3. Attach a pair of extension wires to the bundles for battery connection.
  4. Tape all of the exposed wire and leads on both ends.
  5. Feed the wire bundle through a hole cut in a cardboard end cap that will fit inside the tube.
  6. Hot glue this cap to one end of the tube, and apply a liberal amount of glue to secure the wires.
  7. Solder the SPDT Micro switch to the negative lead, then to the battery.
  8. Make a battery pack by taping the three 1.5V cells together and connect the terminals together by soldering pieces of wire in a series configuration, bringing the total voltage to 4.5V.
  9. Solder the positive battery wire to the battery pack positive terminal.
  10. Solder a wire between the switch and the negative battery pack terminal.
  11. Hot glue the switch and battery pack inside the tube, leaving the switch accessible at the end.
  12. Cut the other cardboard end cap around the switch and hot glue it in.
  13. Enjoy!



    • Warm and Fuzzy Contest

      Warm and Fuzzy Contest
    • Comfort Food Challenge

      Comfort Food Challenge
    • PCB Contest

      PCB Contest