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microcontroller - How can I program an Atmega32u4 over USB with this schematic? - Electrical Engineering Stack Exchange
Arduino Micro USB Microcontroller
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Monday Experiment: Bootloading an ATmega32u4 with Arduino | Murchlabs
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Elite-C V4 - USB-C Pro Micro Replacement ATmega32u4 – Keebio
1pcs USB ATMEGA32U4 Mini Development Board For Arduino Leonardo: Amazon.com: Industrial & Scientific
SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - DEV-15795 - SparkFun Electronics
TIAO AVR / Micro SD Development Board (ATMEGA32U4) - TIAO's Wiki
