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by Pete Prodoehl

Introduction

Meet Sally Servo - the Really Robotic Robot. :)

In this tutorial, you'll learn how to make a sound-reactive LED robot mouth like Sally's. This project requires soldering, but is simple to code and build. Adding a sound reactive mouth will really make your robot costume come alive!

Video Overview

  1. Plan the mouth shape. We used three rows of LEDs, with 8, 7, and 6 LEDs each. Glue the LED strips to a piece of cardboard and solder the rows together as shown. (the order of wires may be different depending on the brand of LEDs you have)
    • Plan the mouth shape. We used three rows of LEDs, with 8, 7, and 6 LEDs each.

    • Glue the LED strips to a piece of cardboard and solder the rows together as shown. (the order of wires may be different depending on the brand of LEDs you have)

    • Tips: Use female jumper wires to start the first row to make it easy to connect to the bit board.

    • Remember to turn the middle row upside down so that you can zig-zag the rows and keep the data flow.

  2. Connect the DI wire to Pin 1 on the bit board, 5V to  + and GND to -.
    • Connect the DI wire to Pin 1 on the bit board, 5V to + and GND to -.

    • Place the micro:bit into the bit board.

  3. Upload the code, available here.
    • Upload the code, available here.

    • When there is only a small amount of noise, the LEDs are barely on, but with a loud noise the LEDs shine brightly. In normal room volume, this will make the robot look like she's talking whenever the person wearing the costume is talking.

  4. Make a rubbing of the LEDs with a crayon and a piece of printer paper. This will create a hole punching template for the correct spacing of the LEDs.
    • Make a rubbing of the LEDs with a crayon and a piece of printer paper. This will create a hole punching template for the correct spacing of the LEDs.

    • Cut out the template.

  5. Place the template where the mouth goes. Use an awl to poke each hole. Alternate: If you don't have an awl, you can cut out a large hole that surrounds all of the LEDs.
    • Place the template where the mouth goes. Use an awl to poke each hole.

    • Alternate: If you don't have an awl, you can cut out a large hole that surrounds all of the LEDs.

  6. Use strong tape or hot glue to position and attach the LEDs (and the cardboard they are glued to) behind the holes. Use strong tape or hot glue to position and attach the LEDs (and the cardboard they are glued to) behind the holes.
    • Use strong tape or hot glue to position and attach the LEDs (and the cardboard they are glued to) behind the holes.

  7. Cover the mouth with a sheet of rhinestones, cut to the shape of a mouth. Remove the mirror backing sheet if you'd like to see the LEDs shine brighter. Cover the mouth with a sheet of rhinestones, cut to the shape of a mouth. Remove the mirror backing sheet if you'd like to see the LEDs shine brighter.
    • Cover the mouth with a sheet of rhinestones, cut to the shape of a mouth. Remove the mirror backing sheet if you'd like to see the LEDs shine brighter.

  8. Connect a battery pack to power the circuit on the go.
    • Connect a battery pack to power the circuit on the go.

  9. Continue to build your Really Robotic Robot costume! For more, view these guides:
Finish Line

Natasha Dzurny

Member since: 08/26/2019

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