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How to use MAX7219 LED matrix (running text, display sensor data, add more LED matrix with Arduino) - miliohm.com
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Amazon.com: GeeekPi 2Pack MAX7219 8 x 32 Dot Matrix MCU 4 in 1 LED Display Module for Arduino Raspberry Pi (Red) : Electronics
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Make Your Own LED Matrix Display Using Arduino With MAX7219 LED Module - 8x32 Display For Beginners - YouTube
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