Pro Micro (Leonardo?) Help with blink test - Programming Questions - Arduino Forum
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Setting Up Arduino Leonardo Pro Micro On Breadboard - IoTMonk
Use a Pro Micro in a Keyboard | Details | Hackaday.io
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Amazon.com: FTCBlock Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header for arduino Leonardo Replace ATmega328 Pro Mini (3pcs) : Electronics