Uploaded January 2021 | Updated September 2026, 2 weeks ago

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MAX7219 dot matrix module interfaced with Arduino Nano is used as a frequency counter displaying the frequency of a periodic signal in Hz or kHz.

Link to code:
akuzechie.blogspot.com/2021/01/max7219-dot-matrix-module-frequency.html

Contents:
0:00 Introduction
0:16 Block Diagram
0:45 C++ Sketch
1:58 Demonstration
2:50 Future Project: Spectrum Analyzer