Overview

This guide shows how to connect an IS31FL3731 to receive audio input from a microphone to drive LEDs.

Demonstration Video

Hardware

The following hardware is used in this project.

• Adafruit 16x9 Charlieplexed PWM LED Matrix Driver - IS31FL3731
• LED Charlieplexed Matrix - 9x16 LEDs
• Adafruit Pro Trinket - 5V 16MHz

Assembly

Here is the circuit diagram:


See the link in the 'Source Code' section for the actual Fritzing diagram file.

Here are some wiring photos:

Software Perequisites

The project requires the following Arduino Libraries

• Adafruit_IS31FL3731
• Adafruit GFX

Source Code

This project uses the following Arduino sketch on the Adafruit Pro Trinket.

IS31FL3731_audio_input

Resources

Adafruit tutorial on IS31FL3731 16x9 Charlieplexed PWM LED Driver