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Adafruit 16x8 LED Matrix Driver Backpack - HT16K33 Breakout : ID 1427 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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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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7) Controlling a MAX7219 dot led matrix module with an Arduino Nano - Zonnestroompanelen in Nederland
GitHub - clockspot/arduino-ledclock: Digital clock code with NTP sync for Arduino Nano 33 IoT and MAX7219 LED matrix
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