In this project, you'll learn how to build an audio reactive LED matrix using the 13x9 IS31FL3741 LED matrix and Feather Sense nRF52840 board with CircuitPython.

The Feather Sense nRF52840 features a built-in PDM MEMs microphone for audio input. Audio is sampled via the onboard PDM microphone. The sampled data is then visualized with color.

The 3D printed case houses the two boards and snap fits for an easy assembly. The case features a built-in button presser for using the reset button without having to take it apart. The LED matrix and Feather are secured to a PCB bracket with hardware screws and nuts.

Prerequisite Guides

Take a moment to review the following guides.


Angled shot of blue, rectangular, microcontroller.
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Add a splash of RGB LEDs to a project you're working on, with this adorable 13x9 RGB LED matrix breakout. It features -- no surprise -- 117 RGB LEDs, each one 2x2mm in size, in a...
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This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium Dupont male headers on the other. Compared with the...
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10 wire Silicone Cover Stranded-Core Ribbon Cable
For those who are fans of our silicone-covered wires, but are always looking to up their wiring game. We now have Silicone Cover Ribbon cables! These may look...
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Black Nylon Screw and Stand-off Set with M2.5 Threads, kit box
Totaling 380 pieces, this M2.5 Screw Set is a must-have for your workstation. You'll have enough screws, nuts, and hex standoffs to fuel your maker...
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This guide was first published on Oct 06, 2021. It was last updated on Jun 14, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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