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Micro/type-c Usb Atmega32u4 Module 5v 16mhz Board For Arduino Atmega32u4-au/mu Controller Pro Micro Replace Pro Mini - Integrated Circuits - AliExpress
GitHub - dmadison/Pro_Micro_USB-A: ATMega32U4 Arduino board from SparkFun, modified to work with a USB-A connector
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Amazon.com: BIT-C Pro Micro MCU with USB-C & DFU bootloader (ATmega32U4, 5V/16MHz) (Black) : Electronics
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