This instructable shows how to use a Raspberry Pi to control a coloured LED strip, based on music played from a web browser.
It shows how to create a basic website using Node.js over HTTPS and use socket.io over WSS (Secure Websocket).
The website has a single page which has a very basic layout. The webpage populates a drop down list with music files, which are located in the public/audio folder on the server. Selecting an option in the list plays the music file in the webpage using the HTML 5 audio element. While playing the music file, the webpage uses the AudioContext interface to analyse the music, which is then sent to the server over a secure websocket connection.
The server running on a Raspberry Pi uses the Node RPI WS281x Native library (wrapping Jeremy Garff’s WS281X library) to change the colours of the LEDs on a WS2811 LED strip, based on the data sent through the websocket.
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8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
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.