Ongoing21 Bands Audio Spectrum Analyzer - SMD Zero
STD21 Bands Audio Spectrum Analyzer - SMD Zero
License
：GPL 3.0
Description
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 5 boards were ordered and built.
** As of Jan.05 2026 based on Aliexpress prices for parts, plus PCB and shipping at JLCPCB, everything add up to $32.88..
** MSGEQ7 alone are $20, however they are currently sold oout at Whizoo.com
Programming the Controller
ESP32 Board Library *** MUST USE *** version 3.0.5 for ESP32-S3-Zero to work properly.
Or, to flash BIN file, use ESP32 Cloner from GitHub - vishalsoniindia/ESP32_Clonner: In the tutorial there is two method to Clone one ESP32 Code to another ESP32.
To view the project visit my Youtube channel: Smallest 21 band Spectrum analyzer possible using the ESP32-S3 Zero - YouTube
Also: Facebook - Visual Vibez
buymeacoffee.com/Dan.Micu
I also make my own 20 x 21 LED Matrix display Panels (see attachments).
Design Drawing
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CloneProject Members
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