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Adafruit Itsy Bitsy 32u4 - 3V 8MHz (AF-3675) ATmega32u4, USB bootloader AVR109 compatible (Flora,Feather 32u4,
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MICRO/MINI/TYPE-C USB ATMEGA32U4 Module 5V 16MHz Board For Arduino ATMEGA32U4-AU/MU Controller Pro-Micro Replace Pro Mini - AliExpress
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Adafruit ItsyBitsy 32u4 - 5V 16MHz (AF-3677) USB bootloader AVR109 compatible (same as Flora, Feather 32u4,
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Teensy (ATmega32u4 USB dev board) 2.0 [ATmega32u4] : ID 199 : $16.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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microcontroller - How can I program an Atmega32u4 over USB with this schematic? - Electrical Engineering Stack Exchange
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Amazon.com: Pro Micro ATmega32U4 5V 16MHz USB Type C Development Module Board with 2 Row pin Header Compatible arduino Leonardo Replace ATmega328 Pro Mini… : Electronics
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