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Pro Micro : how do I use a serial interface to communicate with a device? - Microcontrollers - Arduino Forum
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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
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Amazon.com: KOOKYE 3PCS Pro Micro ATmega32U4 5V/16MHz Module Board 2 Row Pin Header for Arduino Mini Leonardo : Electronics
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