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Adafruit RGB Matrix HAT + RTC for Raspberry Pi - Mini Kit : ID 2345 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Using Swift to control the Raspberry Pi GPIO pins and turn an LED on | by Claudio Carnino | A Swift misadventure | Medium
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Amazon.com: HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B : Electronics
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