MAX7219 ← ATtiny85 Interface for LED Matrix 8x8 - TINUSAUR
7) Controlling a MAX7219 dot led matrix module with an Arduino Nano - Zonnestroompanelen in Nederland
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Amazon.com: ALAMSCN MAX7219 Dot Matrix Module 32x8 4 in 1 LED Display Modules for Arduino Raspberry Pi Microcontroller with 5Pin Wires Red (Pack of 2) : Industrial & Scientific