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Adafruit 1.2 8x8 LED Matrix Backpack : ID 1048 : $6.00 : Adafruit Industries, Unique & fun DIY electronics and kits
GitHub - adafruit/Adafruit_Python_LED_Backpack: Python library for controlling LED backpack displays such as 8x8 matrices, bar graphs, and 7/14-segment displays on a Raspberry Pi or BeagleBone Black.
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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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