Making a large piano like in the movie Big #CircuitPlaygroundExpress #CircuitPython @KarinChechik

Karin Chechik challenged herself to create a big piano like in the piano scene from the movie ‘Big’?

I was very excited about this new idea, but I had two problems: First, I don’t know how to play the piano. Second, CircuitPython represents notes as frequencies, and I didn’t know how to convert between the two.

I found 2 solutions:

  1. Standalone version using the method explained in this blog post by Uri Shaked to convert note names into frequencies.
  2. Use the board as a MIDI controller, so it sends the notes to the computer, and the computer will synthesize the sound and play it on the computer’s speakers.

I decided to try the second option and used Adafruit’s documentation to understand how to use the board as a MIDI controller.

The board used is the Adafruit Circuit Playground Express. It supports CircuitPython out of the box and includes many sensors, RGB LEDs, and a small speaker.

See the video below and the build details.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

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