7 Band Audio Spectrum Analyzer

This is a simple beginner DIY project with low component count and small budget.

samm928

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Description

The Arduino Nano and MSGEQ7 will analyze the audio input and break it into 7 different frequencies then displays the bands accordingly on WS2812B LED bars. MSGEQ has a built-in clock generator so there is no need for an external crystal oscillator. I like everything about this project, since is perfect to start learning and playing with FastLED and NeoMatrix features and allows you to explore your imagination. The only limitation on the Nano controller is the small 32K flash memory which is barely enough to load the code. The sketch included with this project however, does have 16 different FastLED patterns and colors that cycles with the Mode button, or automatically changes every 10 seconds to the next pattern. This project is simple enough so that you can try it out on a small breadboard while the PCBs are being fabricated.

Details

Schematic Ver 2.0 with no battery, to use with USB type-C for 5v power and sketch upload.

PCB Layout Ver 2.0 single sided with two mounting holes.

Try using headers to plug in the Nano. It is much easier to swap a new Nano that is already preprogramed with a different Sketch for new colors and patterns.

Schematic for Ver 3.0 with battery and charging circuit ..

PCB Layout Ver 3.0 with AA battery on top the side and charging circuit on the bottom ..

AA size batteries usually are between 600mAh - 800mAh and don't last very long depending on the LED brightness. You might want to add a 16850 cell in parallel. Added on-off switch and 4 mounting holes.

Files

Remeber The Time.mp4 Running on 4.2V battery and Bluetooth .. also .. https://www.youtube.com/watch?v=NybeTkjHDJE&lc=UgzKvnBz6ssjJFnh4xF4AaABAg MPEG-4 Video - 18.71 MB - 08/31/2023 at 21:52		Download
Sketch_7_bands_analyzer.zip Latest SKETCH for 7-Bands analyzer with 16 color pattern presets, and auto-change mode each for 10 seconds intervals. x-zip-compressed - 8.60 kB - 08/31/2023 at 20:46		Download
Gerber_7 Bands Analyzer Nano with Battery.zip Gerber Files for Ver 3.0 with battery and 4 mounting holes. x-zip-compressed - 103.07 kB - 05/15/2023 at 08:12		Download
Expialidocious.mp4 Video clip Sample of Colors & Patterns with Bluetooth for Audio Input and a portable speaker. MPEG-4 Video - 26.56 MB - 05/15/2023 at 05:45		Download
Spectrum_Analyzer_7_Nano.zip SKETCH for 20 x 7 Bands (140 LEDs Matrix) with output on Pin2. Works for both Ver.02 and Ver.03 boards. x-zip-compressed - 8.74 kB - 05/15/2023 at 04:40		Download