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schematics - Connecting USB-C port with ATmega32u4 - Questions - Electrical Engineering Stack Exchange
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Amazon.com: SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - Compatible with Arduino development board 5V/16MHz microcontroller AP2112 3.3V Voltage Regulator Castellated PTH pin pads Reset button Maximum 6V input : Electronics
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microcontroller - How can I program an Atmega32u4 over USB with this schematic? - Electrical Engineering Stack Exchange
GitHub - dmadison/Pro_Micro_USB-A: ATMega32U4 Arduino board from SparkFun, modified to work with a USB-A connector
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