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Arduino UNO FAQ | Arduino Tips, Tricks, and Techniques | Adafruit Learning System
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Atmega32u4 Board - Com Port Won't Stay Connected : r/arduino
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avr - ATmega32u4 bootloader - Arduino Stack Exchange
Leonardo - Arduino | Mouser
Monday Experiment: Bootloading an ATmega32u4 with Arduino | Murchlabs
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AVR Programming with Adafruit's Atmega32u4 · open collector
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