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Daniel Micu

UNITED STATES OF AMERICA • + Follow Edit Project

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Tools, APP Software Used etc.

arduino IDE

Description

21-Bands Audio Spectrum Analyzer

21 Band Audio Spectrum Analyzer in a Miniature PCB design form factor with full functionality for Bluetooth and Audio Amp. SMD footprints for MSGEQ7 and Si3531. Board size is 60cm x 39.4cm. The 420 RGB leds are now being powered using the USB-C or from one of the LED terminal blocks using 5V. Waveshare ESP32-S3 Zero 18 pin Dev board has enough GPIOs to make this project work. For a while the FastLED library was not available for this board, but version 3.9.11 seems to work. The design was tested on breadboard, and 15 boards were ordered and built by JLCPCB.

Code

Use ESP32 Cloner to upload BIN file to controller.

Sketch_Spectrum_Analyzer_21x20_Red_ESP32_S3_zero.bin

Schematic and Layout

21-Band_Audio-Spectrum_ESP32-S3_SMD_SCH.png

21-Band_Audio_Spectrum_ESP32-S3_SMD_PCB.png

CAD-Custom parts and enclosures

EasyEDA Project

https://oshwlab.com/samm928/21-bands-audio-spectrum-analyzer-micro

Download Gerbers Download BOM(Bill of materials)

Oct 15,2025

231 views

21-Bands Audio Spectrum Analyzer

Small miniaturized SMD design that displays 21 bar frequencies from 50Hz to 16Khz on an LED Matix.

231

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4

Published: Oct 15,2025

Standard PCB

Download Gerber file 5

BOM(Bill of materials)

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PCBWay Donate 10% cost To Author

File Last Updated: 2025/10/16 (GMT+8)

File update record

2025-10-1607:16:59

Centroid file is updated.

2025-10-1607:16:59

Gerber file is updated.

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Copyright Info

Attribution-GPL License

Under the Attribution-GPL License.

PCB
Rigid-Flex
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Injection Molding

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Topic

LED Displays & Matrices

Audio ESP32 LED MS

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