Sound Activated Bowtie

by littleBits November 21, 2013

This festive bow tie moves on a servo and is activated by the sound of your voice! Control how it moves with a pulse and a dimmer.

Bits used: dimmer, power , pulse, servo, sound trigger, wire

Tags: Motion Sound Wearables Hack

Videos and Recipes


  1. 1

    Start by building the circuit: power + wire + sound trigger + wire + pulse + dimmer + servo. The servo should be set on “swing” mode. Adjust the the sensitivity of the sound trigger using the little purple screwdriver. Then adjust the pulse and the dimmer to determine the angle of rotation and speed of your bow tie’s movement.

  2. 2

    Make a small box out of cardboard to house the sound trigger and the servo. This box will sit right in front of your neck so try to make it as small as possible. Make a hole in the top for the sound trigger to stick out of and a small hole on the side for the servo motor.

  3. 3

    Remove the arm on the servo and place the motor inside the box. The small white arm base on the motor should stick out through the small hole you made in the side of the box. From the outside of the box, reconnect the servo arm. When the circuit is activated, you should see the servo arm move on the exterior of the box.

  4. 4

    Place the sound trigger on top on the servo and close the box. You may want to wrap the box in fabric that matches your bow tie.

  5. 5

    Make the collar strap of your bow tie. Attach the small box to a strip of fabric that will go around your neck. You can use tape or wire or fabric glue to secure them together. You can also add Velcro to the back of the collar strap so that you can open and close it easily.

  6. 6

    Sew the pulse, the dimmer, and the servo to the back of the collar strap. Tape the power and to the wire it is connected to so that they don’t come apart. The power and battery will hang down the back (you can hide them under your shirt or jacket).

  7. 7

    Connect the bow tie to the servo arm on the front of the cardboard box. You can sew the bow tie to the small holes on the servo arm or stick a small piece of cardboard to the servo arm (with strong double-sided tape) and sew the bow tie to the cardboard piece.

  8. 8

    Now whenever you speak, your bow tie will speak a language of its own.

Bits used (7)


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Other Materials Used (5)

  • bow tie (already tied) 1
  • Cardboard 1
  • extra fabric for collar strap 1
  • Tape 1
  • Velcro 1

Tools (3)

  • gluedots (or strong double-sided tape)
  • needle and thread
  • utility knife
  • hirumi_littleBits about 1 year ago

    definitely going to need this for a holiday party.

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