The Nintendo Labo RC Toy-Con is simple, but a lot of fun to play with.  Let's make it even better with motion-triggered lights courtesy of Circuit Playground Express.

This modification only uses a little bit of double-sided tape to keep the battery secure, so it's easily reversible if you decide to remove it or make changes.

What You'll Need

First thing we need to do is install the project code. This code will use the Circuit Playground Express's built-in accelerometer to sense vibration and then light up the built in Neopixel LEDs.

Upload the Code

Connect the Circuit Playground Express to your computer with a micro USB cable.  You should see a drive named "CIRCUITPY" appear on your computer. 

You'll need to have the Neopixel library installed on your Circuit Playground Express in order to run this project's CircuitPython code. Follow the steps on this page to install the CircuitPython library bundle.

Copy the following code, paste it into a plain text file or code editor such as Mu. Save the file as "" to the CIRCUITPY drive.

# SPDX-FileCopyrightText: 2018 Collin Cunningham for Adafruit Industries
# SPDX-License-Identifier: MIT

import board
import neopixel
from import cpx

pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=0.1, auto_write=True)

while True:

    x, y, z = cpx.acceleration  # read acceleromter
    r, g, b = 0, 0, 0

    if abs(x) > 4.0:
        r = 255
    if abs(y) > 2.0:
        g = 255
    if z > -6.0 or z < -12.0:
        b = 255

    pixels.fill((r, g, b))

After the file saves, your Circuit Playground Express should reboot and start running the action light code.

Here's what your CIRCUITPY drive should look like with necessary files in place.

Test It

To make sure everything is working, disconnect the Circuit Playground Express from your computer and connect the LiPo battery.

Try shaking the Circuit Playground around a bit.  If it flashes different colors - the code is working!

Mounting the Circuit playground and Battery is easy.  We'll use use tape to mount the battery, and the Circuit Playground will be held in by the RC Car's cardboard tabs.

Mount the Circuit Playground Express




Turn the RC Car upside down and slide the edges of the Circuit Playground Express under two large cardboard tabs. Keep the USB jack pointed toward the car's 'antenna' as seen in the photo above.

Mount the Battery



Apply a small piece of double-sided tape to the battery and press it into place at the front edge of the car's underside.

Connect the battery to the Circuit Playground and turn the car right side up again. That's it - installation is complete :)

Install the Joy-Cons on the RC Car and boot up your Switch. Start up the Labo Variety Pack cartridge, enter RC Car Play mode, and take your new tricked-out ride for a test drive …

When you're done using the car, don't forget to disconnect the battery from the Circuit Playground. This will help preserve battery life. Have fun & drive safe :)

This guide was first published on May 02, 2018. It was last updated on May 02, 2018.