About

This is a spectrum analyzer using Arduino and 8x8 matrix LED.

BOM

(must)

• Arduino Pro mini
• MAX7219 matrix LED module
• MAX4466 mic module
• Some wires

(any)

• Mini breadboard (HiLetgo SY-170 35x47x8.5mm)
• 3V coin battery(CR2032) holder (need 2pcs)
• Push switch (can hold)
• Universal PWB (50x70mm)
• Case by 3D printed

Library which need to build

Arduino FFT Library
MatrizLed

Building

• Build circuits
  • A0 - mic out
  • 10 - CS(MAX7219 module)
  • 11 - CLK(MAX7219 module)
  • 12 - DIN(MAX7219 module)
• Print case
• Assemble
• Adjust mic sensitivity and some parameters in a sketch.
• Finish!

Reference

Arduino FFT Spectrum Analyzer with pedalSHIELDMEGA
Arduino Realtime Audio Spectrum Analyzer with Video out!
968円で作る。LEDイコライザっぽい表示機