Music Spectrum Visualizer, In 10 min, No coding required

What is this project about?

This project demonstrates how Grablo can transform complex audio visualization development into simple, intuitive building. We're creating a real-time music spectrum visualizer using an 8x8 LED matrix that displays colorful columns dancing to your music.

Why did we decide to make it?

Building audio visualizers involves multiple complex challenges: setting up audio capture, implementing frequency analysis, managing precise LED timing, handling memory buffers, debugging hardware communication, and making everything work together in real-time without glitches. With Grablo, you simply think "create 8 LED columns where each column height represents the intensity of a specific frequency" and arrange blocks to make it happen.

What You'll Build

A complete music spectrum visualizer with:

• 8x8 LED matrix displaying colorful dancing columns
• Real-time frequency analysis: 32Hz, 64Hz, 128Hz, 256Hz, 512Hz, 1024Hz, 2048Hz, 4096Hz
• Rainbow color spectrum from red (bass) to purple (treble)
• Fast response for smooth music visualization

Build Process

Dashboard

• Push Button Widget: Variable "Play"

Logic

Logic 1: Music Playback & Analysis

Control 1: Music Playback

• Condition: When Play button is pressed (triggers once)
• Action: Play Media with Audio Analysis enabled
  - Configure 8 frequencies from 32Hz to 4096Hz
  - Store amplitude data in variables

Logic 2: LED Matrix Visualization

Control 1: Matrix Display

• Condition: While music is playing
• Actions: Control Neo Matrix LED
  - Clear all LEDs
  - Draw 8 vertical columns using frequency amplitude variables
  - Apply rainbow colors
  - Display pattern on matrix

That's It!

Your music visualizer is complete! You've created a real-time audio visualizer by simply arranging visual blocks. Grablo handles all the technical complexity - you just focus on your creativity.

Expected Results

When you run your project:

• Press Play button to start music
• LED matrix displays 8 colorful columns dancing to the beat
• Each column represents different frequency ranges
• Real-time spectrum visualization
• Colors transition from red (bass) to purple (treble)

Video Tutorial

Watch the complete 10-minute build process

Quick Start

• Set up hardware
• Click Project Link
• Connect your controller
• Upload your music files (or use included samples)
• Hit RUN!

What's Next?

Expand your project using more blocks:

• Multiple LED matrices for larger displays
• Use Centroid Frequency analysis to detect music brightness (bright vs dark songs)
• Add Overall RMS for volume-reactive lighting brightness
• Create stereo channel separation using Left/Right Channel RMS
• Track dominant frequencies with Peak Frequency Amplitude analysis

Resources & Support

• Official Website:https://grablo.co
• Web Application:https://app.grablo.co
• Documentation:https://doc.grablo.co
• Support Email:support@grablo.co