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Music Visualizer

Student: Dragos-Mihai Ene
Email: dragos_mihai.ene@upb.ro
Master: SRIC

Introduction

Music visualizers help create the right ambiance and make a house more welcoming and pleasant to live in. This project successfully acomplishes all of these characteristics, while also serving as a stepping stone in learning about IoT concepts, ESP32 development and sound processing science.

Project Description

A. Hardware Description

Hardware Components:

NodeMCU32-S ESP32
WS2812B LED Strip
KY-038 Sound Sensor (Microphone)
- A 128×64 display that uses I2C to communicate with the ESP32 dev board.
Breadboard

Block diagram:

Circuit diagram:

Real-life design:

B. Software Description

The project uses the Adafruit_NeoPixel.h, LinkedList.h and Wifi.h libraries for controlling the LED strip and the webserver.

The main logic of the project is represented by the following steps: * set up the Wi-Fi communoication, microphone pin, LED strip object and initialize a list containing the color of the LEDs * in a loop:

read the analogue value outputed by the microphone
run the webserver, thus showing the client the webpage that controls the sound processing variants
based on the current sound representation method, process the sound and add the current LED values
go through each element in the LED strip's list and modify the colors of each one

The music visualization methods:

simple visualization - based solely on the waveform
average visualization - based on the average of sound intensities
frequency based visualization - based on the frequency domain obtained with the FFT algorithm

Demo

Conclusion

This project represents an efficient, simple and nice solution for illuminating a room, visualzing music or any other sounds or just creating a desired mood. For me, it was a very good way to learn more about the ESP32 microcontroller and sound processing.

In my opinion, this project offers a great oppurtunity to be developed into a product that can be ultimately sold to awaiting customers that need something more customizable that the current market offers.